Source file src/cmd/compile/internal/ssa/_gen/AMD64Ops.go

     1  // Copyright 2015 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package main
     6  
     7  import "strings"
     8  
     9  // Notes:
    10  //  - Integer types live in the low portion of registers. Upper portions are junk.
    11  //  - Boolean types use the low-order byte of a register. 0=false, 1=true.
    12  //    Upper bytes are junk.
    13  //  - Floating-point types live in the low natural slot of an sse2 register.
    14  //    Unused portions are junk.
    15  //  - We do not use AH,BH,CH,DH registers.
    16  //  - When doing sub-register operations, we try to write the whole
    17  //    destination register to avoid a partial-register write.
    18  //  - Unused portions of AuxInt (or the Val portion of ValAndOff) are
    19  //    filled by sign-extending the used portion.  Users of AuxInt which interpret
    20  //    AuxInt as unsigned (e.g. shifts) must be careful.
    21  //  - All SymOff opcodes require their offset to fit in an int32.
    22  
    23  // Suffixes encode the bit width of various instructions.
    24  // Q (quad word) = 64 bit
    25  // L (long word) = 32 bit
    26  // W (word)      = 16 bit
    27  // B (byte)      = 8 bit
    28  // D (double)    = 64 bit float
    29  // S (single)    = 32 bit float
    30  
    31  // copied from ../../amd64/reg.go
    32  var regNamesAMD64 = []string{
    33  	"AX",
    34  	"CX",
    35  	"DX",
    36  	"BX",
    37  	"SP",
    38  	"BP",
    39  	"SI",
    40  	"DI",
    41  	"R8",
    42  	"R9",
    43  	"R10",
    44  	"R11",
    45  	"R12",
    46  	"R13",
    47  	"g", // a.k.a. R14
    48  	"R15",
    49  	"X0",
    50  	"X1",
    51  	"X2",
    52  	"X3",
    53  	"X4",
    54  	"X5",
    55  	"X6",
    56  	"X7",
    57  	"X8",
    58  	"X9",
    59  	"X10",
    60  	"X11",
    61  	"X12",
    62  	"X13",
    63  	"X14",
    64  	"X15", // constant 0 in ABIInternal
    65  
    66  	// If you add registers, update asyncPreempt in runtime
    67  
    68  	// pseudo-registers
    69  	"SB",
    70  }
    71  
    72  func init() {
    73  	// Make map from reg names to reg integers.
    74  	if len(regNamesAMD64) > 64 {
    75  		panic("too many registers")
    76  	}
    77  	num := map[string]int{}
    78  	for i, name := range regNamesAMD64 {
    79  		num[name] = i
    80  	}
    81  	buildReg := func(s string) regMask {
    82  		m := regMask(0)
    83  		for _, r := range strings.Split(s, " ") {
    84  			if n, ok := num[r]; ok {
    85  				m |= regMask(1) << uint(n)
    86  				continue
    87  			}
    88  			panic("register " + r + " not found")
    89  		}
    90  		return m
    91  	}
    92  
    93  	// Common individual register masks
    94  	var (
    95  		ax         = buildReg("AX")
    96  		cx         = buildReg("CX")
    97  		dx         = buildReg("DX")
    98  		bx         = buildReg("BX")
    99  		gp         = buildReg("AX CX DX BX BP SI DI R8 R9 R10 R11 R12 R13 R15")
   100  		g          = buildReg("g")
   101  		fp         = buildReg("X0 X1 X2 X3 X4 X5 X6 X7 X8 X9 X10 X11 X12 X13 X14")
   102  		x15        = buildReg("X15")
   103  		gpsp       = gp | buildReg("SP")
   104  		gpspsb     = gpsp | buildReg("SB")
   105  		gpspsbg    = gpspsb | g
   106  		callerSave = gp | fp | g // runtime.setg (and anything calling it) may clobber g
   107  	)
   108  	// Common slices of register masks
   109  	var (
   110  		gponly = []regMask{gp}
   111  		fponly = []regMask{fp}
   112  	)
   113  
   114  	// Common regInfo
   115  	var (
   116  		gp01           = regInfo{inputs: nil, outputs: gponly}
   117  		gp11           = regInfo{inputs: []regMask{gp}, outputs: gponly}
   118  		gp11sp         = regInfo{inputs: []regMask{gpsp}, outputs: gponly}
   119  		gp11sb         = regInfo{inputs: []regMask{gpspsbg}, outputs: gponly}
   120  		gp21           = regInfo{inputs: []regMask{gp, gp}, outputs: gponly}
   121  		gp21sp         = regInfo{inputs: []regMask{gpsp, gp}, outputs: gponly}
   122  		gp21sb         = regInfo{inputs: []regMask{gpspsbg, gpsp}, outputs: gponly}
   123  		gp21shift      = regInfo{inputs: []regMask{gp, cx}, outputs: []regMask{gp}}
   124  		gp31shift      = regInfo{inputs: []regMask{gp, gp, cx}, outputs: []regMask{gp}}
   125  		gp11div        = regInfo{inputs: []regMask{ax, gpsp &^ dx}, outputs: []regMask{ax, dx}}
   126  		gp21hmul       = regInfo{inputs: []regMask{ax, gpsp}, outputs: []regMask{dx}, clobbers: ax}
   127  		gp21flags      = regInfo{inputs: []regMask{gp, gp}, outputs: []regMask{gp, 0}}
   128  		gp2flags1flags = regInfo{inputs: []regMask{gp, gp, 0}, outputs: []regMask{gp, 0}}
   129  
   130  		gp2flags     = regInfo{inputs: []regMask{gpsp, gpsp}}
   131  		gp1flags     = regInfo{inputs: []regMask{gpsp}}
   132  		gp0flagsLoad = regInfo{inputs: []regMask{gpspsbg, 0}}
   133  		gp1flagsLoad = regInfo{inputs: []regMask{gpspsbg, gpsp, 0}}
   134  		gp2flagsLoad = regInfo{inputs: []regMask{gpspsbg, gpsp, gpsp, 0}}
   135  		flagsgp      = regInfo{inputs: nil, outputs: gponly}
   136  
   137  		gp11flags      = regInfo{inputs: []regMask{gp}, outputs: []regMask{gp, 0}}
   138  		gp1flags1flags = regInfo{inputs: []regMask{gp, 0}, outputs: []regMask{gp, 0}}
   139  
   140  		readflags = regInfo{inputs: nil, outputs: gponly}
   141  
   142  		gpload         = regInfo{inputs: []regMask{gpspsbg, 0}, outputs: gponly}
   143  		gp21load       = regInfo{inputs: []regMask{gp, gpspsbg, 0}, outputs: gponly}
   144  		gploadidx      = regInfo{inputs: []regMask{gpspsbg, gpsp, 0}, outputs: gponly}
   145  		gp21loadidx    = regInfo{inputs: []regMask{gp, gpspsbg, gpsp, 0}, outputs: gponly}
   146  		gp21shxload    = regInfo{inputs: []regMask{gpspsbg, gp, 0}, outputs: gponly}
   147  		gp21shxloadidx = regInfo{inputs: []regMask{gpspsbg, gpsp, gp, 0}, outputs: gponly}
   148  
   149  		gpstore         = regInfo{inputs: []regMask{gpspsbg, gpsp, 0}}
   150  		gpstoreconst    = regInfo{inputs: []regMask{gpspsbg, 0}}
   151  		gpstoreidx      = regInfo{inputs: []regMask{gpspsbg, gpsp, gpsp, 0}}
   152  		gpstoreconstidx = regInfo{inputs: []regMask{gpspsbg, gpsp, 0}}
   153  		gpstorexchg     = regInfo{inputs: []regMask{gp, gpspsbg, 0}, outputs: []regMask{gp}}
   154  		cmpxchg         = regInfo{inputs: []regMask{gp, ax, gp, 0}, outputs: []regMask{gp, 0}, clobbers: ax}
   155  		atomicLogic     = regInfo{inputs: []regMask{gp &^ ax, gp &^ ax, 0}, outputs: []regMask{ax, 0}}
   156  
   157  		fp01        = regInfo{inputs: nil, outputs: fponly}
   158  		fp21        = regInfo{inputs: []regMask{fp, fp}, outputs: fponly}
   159  		fp31        = regInfo{inputs: []regMask{fp, fp, fp}, outputs: fponly}
   160  		fp21load    = regInfo{inputs: []regMask{fp, gpspsbg, 0}, outputs: fponly}
   161  		fp21loadidx = regInfo{inputs: []regMask{fp, gpspsbg, gpspsb, 0}, outputs: fponly}
   162  		fpgp        = regInfo{inputs: fponly, outputs: gponly}
   163  		gpfp        = regInfo{inputs: gponly, outputs: fponly}
   164  		fp11        = regInfo{inputs: fponly, outputs: fponly}
   165  		fp2flags    = regInfo{inputs: []regMask{fp, fp}}
   166  
   167  		fpload    = regInfo{inputs: []regMask{gpspsb, 0}, outputs: fponly}
   168  		fploadidx = regInfo{inputs: []regMask{gpspsb, gpsp, 0}, outputs: fponly}
   169  
   170  		fpstore    = regInfo{inputs: []regMask{gpspsb, fp, 0}}
   171  		fpstoreidx = regInfo{inputs: []regMask{gpspsb, gpsp, fp, 0}}
   172  
   173  		prefreg = regInfo{inputs: []regMask{gpspsbg}}
   174  	)
   175  
   176  	var AMD64ops = []opData{
   177  		// {ADD,SUB,MUL,DIV}Sx: floating-point arithmetic
   178  		// x==S for float32, x==D for float64
   179  		// computes arg0 OP arg1
   180  		{name: "ADDSS", argLength: 2, reg: fp21, asm: "ADDSS", commutative: true, resultInArg0: true},
   181  		{name: "ADDSD", argLength: 2, reg: fp21, asm: "ADDSD", commutative: true, resultInArg0: true},
   182  		{name: "SUBSS", argLength: 2, reg: fp21, asm: "SUBSS", resultInArg0: true},
   183  		{name: "SUBSD", argLength: 2, reg: fp21, asm: "SUBSD", resultInArg0: true},
   184  		{name: "MULSS", argLength: 2, reg: fp21, asm: "MULSS", commutative: true, resultInArg0: true},
   185  		{name: "MULSD", argLength: 2, reg: fp21, asm: "MULSD", commutative: true, resultInArg0: true},
   186  		{name: "DIVSS", argLength: 2, reg: fp21, asm: "DIVSS", resultInArg0: true},
   187  		{name: "DIVSD", argLength: 2, reg: fp21, asm: "DIVSD", resultInArg0: true},
   188  
   189  		// MOVSxload: floating-point loads
   190  		// x==S for float32, x==D for float64
   191  		// load from arg0+auxint+aux, arg1 = mem
   192  		{name: "MOVSSload", argLength: 2, reg: fpload, asm: "MOVSS", aux: "SymOff", faultOnNilArg0: true, symEffect: "Read"},
   193  		{name: "MOVSDload", argLength: 2, reg: fpload, asm: "MOVSD", aux: "SymOff", faultOnNilArg0: true, symEffect: "Read"},
   194  
   195  		// MOVSxconst: floatint-point constants
   196  		// x==S for float32, x==D for float64
   197  		{name: "MOVSSconst", reg: fp01, asm: "MOVSS", aux: "Float32", rematerializeable: true},
   198  		{name: "MOVSDconst", reg: fp01, asm: "MOVSD", aux: "Float64", rematerializeable: true},
   199  
   200  		// MOVSxloadidx: floating-point indexed loads
   201  		// x==S for float32, x==D for float64
   202  		// load from arg0 + scale*arg1+auxint+aux, arg2 = mem
   203  		{name: "MOVSSloadidx1", argLength: 3, reg: fploadidx, asm: "MOVSS", scale: 1, aux: "SymOff", symEffect: "Read"},
   204  		{name: "MOVSSloadidx4", argLength: 3, reg: fploadidx, asm: "MOVSS", scale: 4, aux: "SymOff", symEffect: "Read"},
   205  		{name: "MOVSDloadidx1", argLength: 3, reg: fploadidx, asm: "MOVSD", scale: 1, aux: "SymOff", symEffect: "Read"},
   206  		{name: "MOVSDloadidx8", argLength: 3, reg: fploadidx, asm: "MOVSD", scale: 8, aux: "SymOff", symEffect: "Read"},
   207  
   208  		// MOVSxstore: floating-point stores
   209  		// x==S for float32, x==D for float64
   210  		// does *(arg0+auxint+aux) = arg1, arg2 = mem
   211  		{name: "MOVSSstore", argLength: 3, reg: fpstore, asm: "MOVSS", aux: "SymOff", faultOnNilArg0: true, symEffect: "Write"},
   212  		{name: "MOVSDstore", argLength: 3, reg: fpstore, asm: "MOVSD", aux: "SymOff", faultOnNilArg0: true, symEffect: "Write"},
   213  
   214  		// MOVSxstoreidx: floating-point indexed stores
   215  		// x==S for float32, x==D for float64
   216  		// does *(arg0+scale*arg1+auxint+aux) = arg2, arg3 = mem
   217  		{name: "MOVSSstoreidx1", argLength: 4, reg: fpstoreidx, asm: "MOVSS", scale: 1, aux: "SymOff", symEffect: "Write"},
   218  		{name: "MOVSSstoreidx4", argLength: 4, reg: fpstoreidx, asm: "MOVSS", scale: 4, aux: "SymOff", symEffect: "Write"},
   219  		{name: "MOVSDstoreidx1", argLength: 4, reg: fpstoreidx, asm: "MOVSD", scale: 1, aux: "SymOff", symEffect: "Write"},
   220  		{name: "MOVSDstoreidx8", argLength: 4, reg: fpstoreidx, asm: "MOVSD", scale: 8, aux: "SymOff", symEffect: "Write"},
   221  
   222  		// {ADD,SUB,MUL,DIV}Sxload: floating-point load / op combo
   223  		// x==S for float32, x==D for float64
   224  		// computes arg0 OP *(arg1+auxint+aux), arg2=mem
   225  		{name: "ADDSSload", argLength: 3, reg: fp21load, asm: "ADDSS", aux: "SymOff", resultInArg0: true, faultOnNilArg1: true, symEffect: "Read"},
   226  		{name: "ADDSDload", argLength: 3, reg: fp21load, asm: "ADDSD", aux: "SymOff", resultInArg0: true, faultOnNilArg1: true, symEffect: "Read"},
   227  		{name: "SUBSSload", argLength: 3, reg: fp21load, asm: "SUBSS", aux: "SymOff", resultInArg0: true, faultOnNilArg1: true, symEffect: "Read"},
   228  		{name: "SUBSDload", argLength: 3, reg: fp21load, asm: "SUBSD", aux: "SymOff", resultInArg0: true, faultOnNilArg1: true, symEffect: "Read"},
   229  		{name: "MULSSload", argLength: 3, reg: fp21load, asm: "MULSS", aux: "SymOff", resultInArg0: true, faultOnNilArg1: true, symEffect: "Read"},
   230  		{name: "MULSDload", argLength: 3, reg: fp21load, asm: "MULSD", aux: "SymOff", resultInArg0: true, faultOnNilArg1: true, symEffect: "Read"},
   231  		{name: "DIVSSload", argLength: 3, reg: fp21load, asm: "DIVSS", aux: "SymOff", resultInArg0: true, faultOnNilArg1: true, symEffect: "Read"},
   232  		{name: "DIVSDload", argLength: 3, reg: fp21load, asm: "DIVSD", aux: "SymOff", resultInArg0: true, faultOnNilArg1: true, symEffect: "Read"},
   233  
   234  		// {ADD,SUB,MUL,DIV}Sxloadidx: floating-point indexed load / op combo
   235  		// x==S for float32, x==D for float64
   236  		// computes arg0 OP *(arg1+scale*arg2+auxint+aux), arg3=mem
   237  		{name: "ADDSSloadidx1", argLength: 4, reg: fp21loadidx, asm: "ADDSS", scale: 1, aux: "SymOff", resultInArg0: true, symEffect: "Read"},
   238  		{name: "ADDSSloadidx4", argLength: 4, reg: fp21loadidx, asm: "ADDSS", scale: 4, aux: "SymOff", resultInArg0: true, symEffect: "Read"},
   239  		{name: "ADDSDloadidx1", argLength: 4, reg: fp21loadidx, asm: "ADDSD", scale: 1, aux: "SymOff", resultInArg0: true, symEffect: "Read"},
   240  		{name: "ADDSDloadidx8", argLength: 4, reg: fp21loadidx, asm: "ADDSD", scale: 8, aux: "SymOff", resultInArg0: true, symEffect: "Read"},
   241  		{name: "SUBSSloadidx1", argLength: 4, reg: fp21loadidx, asm: "SUBSS", scale: 1, aux: "SymOff", resultInArg0: true, symEffect: "Read"},
   242  		{name: "SUBSSloadidx4", argLength: 4, reg: fp21loadidx, asm: "SUBSS", scale: 4, aux: "SymOff", resultInArg0: true, symEffect: "Read"},
   243  		{name: "SUBSDloadidx1", argLength: 4, reg: fp21loadidx, asm: "SUBSD", scale: 1, aux: "SymOff", resultInArg0: true, symEffect: "Read"},
   244  		{name: "SUBSDloadidx8", argLength: 4, reg: fp21loadidx, asm: "SUBSD", scale: 8, aux: "SymOff", resultInArg0: true, symEffect: "Read"},
   245  		{name: "MULSSloadidx1", argLength: 4, reg: fp21loadidx, asm: "MULSS", scale: 1, aux: "SymOff", resultInArg0: true, symEffect: "Read"},
   246  		{name: "MULSSloadidx4", argLength: 4, reg: fp21loadidx, asm: "MULSS", scale: 4, aux: "SymOff", resultInArg0: true, symEffect: "Read"},
   247  		{name: "MULSDloadidx1", argLength: 4, reg: fp21loadidx, asm: "MULSD", scale: 1, aux: "SymOff", resultInArg0: true, symEffect: "Read"},
   248  		{name: "MULSDloadidx8", argLength: 4, reg: fp21loadidx, asm: "MULSD", scale: 8, aux: "SymOff", resultInArg0: true, symEffect: "Read"},
   249  		{name: "DIVSSloadidx1", argLength: 4, reg: fp21loadidx, asm: "DIVSS", scale: 1, aux: "SymOff", resultInArg0: true, symEffect: "Read"},
   250  		{name: "DIVSSloadidx4", argLength: 4, reg: fp21loadidx, asm: "DIVSS", scale: 4, aux: "SymOff", resultInArg0: true, symEffect: "Read"},
   251  		{name: "DIVSDloadidx1", argLength: 4, reg: fp21loadidx, asm: "DIVSD", scale: 1, aux: "SymOff", resultInArg0: true, symEffect: "Read"},
   252  		{name: "DIVSDloadidx8", argLength: 4, reg: fp21loadidx, asm: "DIVSD", scale: 8, aux: "SymOff", resultInArg0: true, symEffect: "Read"},
   253  
   254  		// {ADD,SUB,MUL,DIV,AND,OR,XOR}x: binary integer ops
   255  		//   unadorned versions compute arg0 OP arg1
   256  		//       const versions compute arg0 OP auxint (auxint is a sign-extended 32-bit value)
   257  		// constmodify versions compute *(arg0+ValAndOff(AuxInt).Off().aux) OP= ValAndOff(AuxInt).Val(), arg1 = mem
   258  		// x==L operations zero the upper 4 bytes of the destination register (not meaningful for constmodify versions).
   259  		{name: "ADDQ", argLength: 2, reg: gp21sp, asm: "ADDQ", commutative: true, clobberFlags: true},
   260  		{name: "ADDL", argLength: 2, reg: gp21sp, asm: "ADDL", commutative: true, clobberFlags: true},
   261  		{name: "ADDQconst", argLength: 1, reg: gp11sp, asm: "ADDQ", aux: "Int32", typ: "UInt64", clobberFlags: true},
   262  		{name: "ADDLconst", argLength: 1, reg: gp11sp, asm: "ADDL", aux: "Int32", clobberFlags: true},
   263  		{name: "ADDQconstmodify", argLength: 2, reg: gpstoreconst, asm: "ADDQ", aux: "SymValAndOff", clobberFlags: true, faultOnNilArg0: true, symEffect: "Read,Write"},
   264  		{name: "ADDLconstmodify", argLength: 2, reg: gpstoreconst, asm: "ADDL", aux: "SymValAndOff", clobberFlags: true, faultOnNilArg0: true, symEffect: "Read,Write"},
   265  
   266  		{name: "SUBQ", argLength: 2, reg: gp21, asm: "SUBQ", resultInArg0: true, clobberFlags: true},
   267  		{name: "SUBL", argLength: 2, reg: gp21, asm: "SUBL", resultInArg0: true, clobberFlags: true},
   268  		{name: "SUBQconst", argLength: 1, reg: gp11, asm: "SUBQ", aux: "Int32", resultInArg0: true, clobberFlags: true},
   269  		{name: "SUBLconst", argLength: 1, reg: gp11, asm: "SUBL", aux: "Int32", resultInArg0: true, clobberFlags: true},
   270  
   271  		{name: "MULQ", argLength: 2, reg: gp21, asm: "IMULQ", commutative: true, resultInArg0: true, clobberFlags: true},
   272  		{name: "MULL", argLength: 2, reg: gp21, asm: "IMULL", commutative: true, resultInArg0: true, clobberFlags: true},
   273  		{name: "MULQconst", argLength: 1, reg: gp11, asm: "IMUL3Q", aux: "Int32", clobberFlags: true},
   274  		{name: "MULLconst", argLength: 1, reg: gp11, asm: "IMUL3L", aux: "Int32", clobberFlags: true},
   275  
   276  		// Let x = arg0*arg1 (full 32x32->64  unsigned multiply). Returns uint32(x), and flags set to overflow if uint32(x) != x.
   277  		{name: "MULLU", argLength: 2, reg: regInfo{inputs: []regMask{ax, gpsp}, outputs: []regMask{ax, 0}, clobbers: dx}, typ: "(UInt32,Flags)", asm: "MULL", commutative: true, clobberFlags: true},
   278  		// Let x = arg0*arg1 (full 64x64->128 unsigned multiply). Returns uint64(x), and flags set to overflow if uint64(x) != x.
   279  		{name: "MULQU", argLength: 2, reg: regInfo{inputs: []regMask{ax, gpsp}, outputs: []regMask{ax, 0}, clobbers: dx}, typ: "(UInt64,Flags)", asm: "MULQ", commutative: true, clobberFlags: true},
   280  
   281  		// HMULx[U]: computes the high bits of an integer multiply.
   282  		// computes arg0 * arg1 >> (x==L?32:64)
   283  		// The multiply is unsigned for the U versions, signed for the non-U versions.
   284  		// HMULx[U] are intentionally not marked as commutative, even though they are.
   285  		// This is because they have asymmetric register requirements.
   286  		// There are rewrite rules to try to place arguments in preferable slots.
   287  		{name: "HMULQ", argLength: 2, reg: gp21hmul, asm: "IMULQ", clobberFlags: true},
   288  		{name: "HMULL", argLength: 2, reg: gp21hmul, asm: "IMULL", clobberFlags: true},
   289  		{name: "HMULQU", argLength: 2, reg: gp21hmul, asm: "MULQ", clobberFlags: true},
   290  		{name: "HMULLU", argLength: 2, reg: gp21hmul, asm: "MULL", clobberFlags: true},
   291  
   292  		// (arg0 + arg1) / 2 as unsigned, all 64 result bits
   293  		{name: "AVGQU", argLength: 2, reg: gp21, commutative: true, resultInArg0: true, clobberFlags: true},
   294  
   295  		// DIVx[U] computes [arg0 / arg1, arg0 % arg1]
   296  		// For signed versions, AuxInt non-zero means that the divisor has been proved to be not -1.
   297  		{name: "DIVQ", argLength: 2, reg: gp11div, typ: "(Int64,Int64)", asm: "IDIVQ", aux: "Bool", clobberFlags: true},
   298  		{name: "DIVL", argLength: 2, reg: gp11div, typ: "(Int32,Int32)", asm: "IDIVL", aux: "Bool", clobberFlags: true},
   299  		{name: "DIVW", argLength: 2, reg: gp11div, typ: "(Int16,Int16)", asm: "IDIVW", aux: "Bool", clobberFlags: true},
   300  		{name: "DIVQU", argLength: 2, reg: gp11div, typ: "(UInt64,UInt64)", asm: "DIVQ", clobberFlags: true},
   301  		{name: "DIVLU", argLength: 2, reg: gp11div, typ: "(UInt32,UInt32)", asm: "DIVL", clobberFlags: true},
   302  		{name: "DIVWU", argLength: 2, reg: gp11div, typ: "(UInt16,UInt16)", asm: "DIVW", clobberFlags: true},
   303  
   304  		// computes -arg0, flags set for 0-arg0.
   305  		{name: "NEGLflags", argLength: 1, reg: gp11flags, typ: "(UInt32,Flags)", asm: "NEGL", resultInArg0: true},
   306  
   307  		// The following 4 add opcodes return the low 64 bits of the sum in the first result and
   308  		// the carry (the 65th bit) in the carry flag.
   309  		{name: "ADDQcarry", argLength: 2, reg: gp21flags, typ: "(UInt64,Flags)", asm: "ADDQ", commutative: true, resultInArg0: true}, // r = arg0+arg1
   310  		{name: "ADCQ", argLength: 3, reg: gp2flags1flags, typ: "(UInt64,Flags)", asm: "ADCQ", commutative: true, resultInArg0: true}, // r = arg0+arg1+carry(arg2)
   311  		{name: "ADDQconstcarry", argLength: 1, reg: gp11flags, typ: "(UInt64,Flags)", asm: "ADDQ", aux: "Int32", resultInArg0: true}, // r = arg0+auxint
   312  		{name: "ADCQconst", argLength: 2, reg: gp1flags1flags, typ: "(UInt64,Flags)", asm: "ADCQ", aux: "Int32", resultInArg0: true}, // r = arg0+auxint+carry(arg1)
   313  
   314  		// The following 4 add opcodes return the low 64 bits of the difference in the first result and
   315  		// the borrow (if the result is negative) in the carry flag.
   316  		{name: "SUBQborrow", argLength: 2, reg: gp21flags, typ: "(UInt64,Flags)", asm: "SUBQ", resultInArg0: true},                    // r = arg0-arg1
   317  		{name: "SBBQ", argLength: 3, reg: gp2flags1flags, typ: "(UInt64,Flags)", asm: "SBBQ", resultInArg0: true},                     // r = arg0-(arg1+carry(arg2))
   318  		{name: "SUBQconstborrow", argLength: 1, reg: gp11flags, typ: "(UInt64,Flags)", asm: "SUBQ", aux: "Int32", resultInArg0: true}, // r = arg0-auxint
   319  		{name: "SBBQconst", argLength: 2, reg: gp1flags1flags, typ: "(UInt64,Flags)", asm: "SBBQ", aux: "Int32", resultInArg0: true},  // r = arg0-(auxint+carry(arg1))
   320  
   321  		{name: "MULQU2", argLength: 2, reg: regInfo{inputs: []regMask{ax, gpsp}, outputs: []regMask{dx, ax}}, commutative: true, asm: "MULQ", clobberFlags: true}, // arg0 * arg1, returns (hi, lo)
   322  		{name: "DIVQU2", argLength: 3, reg: regInfo{inputs: []regMask{dx, ax, gpsp}, outputs: []regMask{ax, dx}}, asm: "DIVQ", clobberFlags: true},                // arg0:arg1 / arg2 (128-bit divided by 64-bit), returns (q, r)
   323  
   324  		{name: "ANDQ", argLength: 2, reg: gp21, asm: "ANDQ", commutative: true, resultInArg0: true, clobberFlags: true},                                                 // arg0 & arg1
   325  		{name: "ANDL", argLength: 2, reg: gp21, asm: "ANDL", commutative: true, resultInArg0: true, clobberFlags: true},                                                 // arg0 & arg1
   326  		{name: "ANDQconst", argLength: 1, reg: gp11, asm: "ANDQ", aux: "Int32", resultInArg0: true, clobberFlags: true},                                                 // arg0 & auxint
   327  		{name: "ANDLconst", argLength: 1, reg: gp11, asm: "ANDL", aux: "Int32", resultInArg0: true, clobberFlags: true},                                                 // arg0 & auxint
   328  		{name: "ANDQconstmodify", argLength: 2, reg: gpstoreconst, asm: "ANDQ", aux: "SymValAndOff", clobberFlags: true, faultOnNilArg0: true, symEffect: "Read,Write"}, // and ValAndOff(AuxInt).Val() to arg0+ValAndOff(AuxInt).Off()+aux, arg1=mem
   329  		{name: "ANDLconstmodify", argLength: 2, reg: gpstoreconst, asm: "ANDL", aux: "SymValAndOff", clobberFlags: true, faultOnNilArg0: true, symEffect: "Read,Write"}, // and ValAndOff(AuxInt).Val() to arg0+ValAndOff(AuxInt).Off()+aux, arg1=mem
   330  
   331  		{name: "ORQ", argLength: 2, reg: gp21, asm: "ORQ", commutative: true, resultInArg0: true, clobberFlags: true},                                                 // arg0 | arg1
   332  		{name: "ORL", argLength: 2, reg: gp21, asm: "ORL", commutative: true, resultInArg0: true, clobberFlags: true},                                                 // arg0 | arg1
   333  		{name: "ORQconst", argLength: 1, reg: gp11, asm: "ORQ", aux: "Int32", resultInArg0: true, clobberFlags: true},                                                 // arg0 | auxint
   334  		{name: "ORLconst", argLength: 1, reg: gp11, asm: "ORL", aux: "Int32", resultInArg0: true, clobberFlags: true},                                                 // arg0 | auxint
   335  		{name: "ORQconstmodify", argLength: 2, reg: gpstoreconst, asm: "ORQ", aux: "SymValAndOff", clobberFlags: true, faultOnNilArg0: true, symEffect: "Read,Write"}, // or ValAndOff(AuxInt).Val() to arg0+ValAndOff(AuxInt).Off()+aux, arg1=mem
   336  		{name: "ORLconstmodify", argLength: 2, reg: gpstoreconst, asm: "ORL", aux: "SymValAndOff", clobberFlags: true, faultOnNilArg0: true, symEffect: "Read,Write"}, // or ValAndOff(AuxInt).Val() to arg0+ValAndOff(AuxInt).Off()+aux, arg1=mem
   337  
   338  		{name: "XORQ", argLength: 2, reg: gp21, asm: "XORQ", commutative: true, resultInArg0: true, clobberFlags: true},                                                 // arg0 ^ arg1
   339  		{name: "XORL", argLength: 2, reg: gp21, asm: "XORL", commutative: true, resultInArg0: true, clobberFlags: true},                                                 // arg0 ^ arg1
   340  		{name: "XORQconst", argLength: 1, reg: gp11, asm: "XORQ", aux: "Int32", resultInArg0: true, clobberFlags: true},                                                 // arg0 ^ auxint
   341  		{name: "XORLconst", argLength: 1, reg: gp11, asm: "XORL", aux: "Int32", resultInArg0: true, clobberFlags: true},                                                 // arg0 ^ auxint
   342  		{name: "XORQconstmodify", argLength: 2, reg: gpstoreconst, asm: "XORQ", aux: "SymValAndOff", clobberFlags: true, faultOnNilArg0: true, symEffect: "Read,Write"}, // xor ValAndOff(AuxInt).Val() to arg0+ValAndOff(AuxInt).Off()+aux, arg1=mem
   343  		{name: "XORLconstmodify", argLength: 2, reg: gpstoreconst, asm: "XORL", aux: "SymValAndOff", clobberFlags: true, faultOnNilArg0: true, symEffect: "Read,Write"}, // xor ValAndOff(AuxInt).Val() to arg0+ValAndOff(AuxInt).Off()+aux, arg1=mem
   344  
   345  		// CMPx: compare arg0 to arg1.
   346  		{name: "CMPQ", argLength: 2, reg: gp2flags, asm: "CMPQ", typ: "Flags"},
   347  		{name: "CMPL", argLength: 2, reg: gp2flags, asm: "CMPL", typ: "Flags"},
   348  		{name: "CMPW", argLength: 2, reg: gp2flags, asm: "CMPW", typ: "Flags"},
   349  		{name: "CMPB", argLength: 2, reg: gp2flags, asm: "CMPB", typ: "Flags"},
   350  
   351  		// CMPxconst: compare arg0 to auxint.
   352  		{name: "CMPQconst", argLength: 1, reg: gp1flags, asm: "CMPQ", typ: "Flags", aux: "Int32"},
   353  		{name: "CMPLconst", argLength: 1, reg: gp1flags, asm: "CMPL", typ: "Flags", aux: "Int32"},
   354  		{name: "CMPWconst", argLength: 1, reg: gp1flags, asm: "CMPW", typ: "Flags", aux: "Int16"},
   355  		{name: "CMPBconst", argLength: 1, reg: gp1flags, asm: "CMPB", typ: "Flags", aux: "Int8"},
   356  
   357  		// CMPxload: compare *(arg0+auxint+aux) to arg1 (in that order). arg2=mem.
   358  		{name: "CMPQload", argLength: 3, reg: gp1flagsLoad, asm: "CMPQ", aux: "SymOff", typ: "Flags", symEffect: "Read", faultOnNilArg0: true},
   359  		{name: "CMPLload", argLength: 3, reg: gp1flagsLoad, asm: "CMPL", aux: "SymOff", typ: "Flags", symEffect: "Read", faultOnNilArg0: true},
   360  		{name: "CMPWload", argLength: 3, reg: gp1flagsLoad, asm: "CMPW", aux: "SymOff", typ: "Flags", symEffect: "Read", faultOnNilArg0: true},
   361  		{name: "CMPBload", argLength: 3, reg: gp1flagsLoad, asm: "CMPB", aux: "SymOff", typ: "Flags", symEffect: "Read", faultOnNilArg0: true},
   362  
   363  		// CMPxconstload: compare *(arg0+ValAndOff(AuxInt).Off()+aux) to ValAndOff(AuxInt).Val() (in that order). arg1=mem.
   364  		{name: "CMPQconstload", argLength: 2, reg: gp0flagsLoad, asm: "CMPQ", aux: "SymValAndOff", typ: "Flags", symEffect: "Read", faultOnNilArg0: true},
   365  		{name: "CMPLconstload", argLength: 2, reg: gp0flagsLoad, asm: "CMPL", aux: "SymValAndOff", typ: "Flags", symEffect: "Read", faultOnNilArg0: true},
   366  		{name: "CMPWconstload", argLength: 2, reg: gp0flagsLoad, asm: "CMPW", aux: "SymValAndOff", typ: "Flags", symEffect: "Read", faultOnNilArg0: true},
   367  		{name: "CMPBconstload", argLength: 2, reg: gp0flagsLoad, asm: "CMPB", aux: "SymValAndOff", typ: "Flags", symEffect: "Read", faultOnNilArg0: true},
   368  
   369  		// CMPxloadidx: compare *(arg0+N*arg1+auxint+aux) to arg2 (in that order). arg3=mem.
   370  		{name: "CMPQloadidx8", argLength: 4, reg: gp2flagsLoad, asm: "CMPQ", scale: 8, aux: "SymOff", typ: "Flags", symEffect: "Read"},
   371  		{name: "CMPQloadidx1", argLength: 4, reg: gp2flagsLoad, asm: "CMPQ", scale: 1, commutative: true, aux: "SymOff", typ: "Flags", symEffect: "Read"},
   372  		{name: "CMPLloadidx4", argLength: 4, reg: gp2flagsLoad, asm: "CMPL", scale: 4, aux: "SymOff", typ: "Flags", symEffect: "Read"},
   373  		{name: "CMPLloadidx1", argLength: 4, reg: gp2flagsLoad, asm: "CMPL", scale: 1, commutative: true, aux: "SymOff", typ: "Flags", symEffect: "Read"},
   374  		{name: "CMPWloadidx2", argLength: 4, reg: gp2flagsLoad, asm: "CMPW", scale: 2, aux: "SymOff", typ: "Flags", symEffect: "Read"},
   375  		{name: "CMPWloadidx1", argLength: 4, reg: gp2flagsLoad, asm: "CMPW", scale: 1, commutative: true, aux: "SymOff", typ: "Flags", symEffect: "Read"},
   376  		{name: "CMPBloadidx1", argLength: 4, reg: gp2flagsLoad, asm: "CMPB", scale: 1, commutative: true, aux: "SymOff", typ: "Flags", symEffect: "Read"},
   377  
   378  		// CMPxconstloadidx: compare *(arg0+N*arg1+ValAndOff(AuxInt).Off()+aux) to ValAndOff(AuxInt).Val() (in that order). arg2=mem.
   379  		{name: "CMPQconstloadidx8", argLength: 3, reg: gp1flagsLoad, asm: "CMPQ", scale: 8, aux: "SymValAndOff", typ: "Flags", symEffect: "Read"},
   380  		{name: "CMPQconstloadidx1", argLength: 3, reg: gp1flagsLoad, asm: "CMPQ", scale: 1, commutative: true, aux: "SymValAndOff", typ: "Flags", symEffect: "Read"},
   381  		{name: "CMPLconstloadidx4", argLength: 3, reg: gp1flagsLoad, asm: "CMPL", scale: 4, aux: "SymValAndOff", typ: "Flags", symEffect: "Read"},
   382  		{name: "CMPLconstloadidx1", argLength: 3, reg: gp1flagsLoad, asm: "CMPL", scale: 1, commutative: true, aux: "SymValAndOff", typ: "Flags", symEffect: "Read"},
   383  		{name: "CMPWconstloadidx2", argLength: 3, reg: gp1flagsLoad, asm: "CMPW", scale: 2, aux: "SymValAndOff", typ: "Flags", symEffect: "Read"},
   384  		{name: "CMPWconstloadidx1", argLength: 3, reg: gp1flagsLoad, asm: "CMPW", scale: 1, commutative: true, aux: "SymValAndOff", typ: "Flags", symEffect: "Read"},
   385  		{name: "CMPBconstloadidx1", argLength: 3, reg: gp1flagsLoad, asm: "CMPB", scale: 1, commutative: true, aux: "SymValAndOff", typ: "Flags", symEffect: "Read"},
   386  
   387  		// UCOMISx: floating-point compare arg0 to arg1
   388  		// x==S for float32, x==D for float64
   389  		{name: "UCOMISS", argLength: 2, reg: fp2flags, asm: "UCOMISS", typ: "Flags"},
   390  		{name: "UCOMISD", argLength: 2, reg: fp2flags, asm: "UCOMISD", typ: "Flags"},
   391  
   392  		// bit test/set/clear operations
   393  		{name: "BTL", argLength: 2, reg: gp2flags, asm: "BTL", typ: "Flags"},                                           // test whether bit arg0%32 in arg1 is set
   394  		{name: "BTQ", argLength: 2, reg: gp2flags, asm: "BTQ", typ: "Flags"},                                           // test whether bit arg0%64 in arg1 is set
   395  		{name: "BTCL", argLength: 2, reg: gp21, asm: "BTCL", resultInArg0: true, clobberFlags: true},                   // complement bit arg1%32 in arg0
   396  		{name: "BTCQ", argLength: 2, reg: gp21, asm: "BTCQ", resultInArg0: true, clobberFlags: true},                   // complement bit arg1%64 in arg0
   397  		{name: "BTRL", argLength: 2, reg: gp21, asm: "BTRL", resultInArg0: true, clobberFlags: true},                   // reset bit arg1%32 in arg0
   398  		{name: "BTRQ", argLength: 2, reg: gp21, asm: "BTRQ", resultInArg0: true, clobberFlags: true},                   // reset bit arg1%64 in arg0
   399  		{name: "BTSL", argLength: 2, reg: gp21, asm: "BTSL", resultInArg0: true, clobberFlags: true},                   // set bit arg1%32 in arg0
   400  		{name: "BTSQ", argLength: 2, reg: gp21, asm: "BTSQ", resultInArg0: true, clobberFlags: true},                   // set bit arg1%64 in arg0
   401  		{name: "BTLconst", argLength: 1, reg: gp1flags, asm: "BTL", typ: "Flags", aux: "Int8"},                         // test whether bit auxint in arg0 is set, 0 <= auxint < 32
   402  		{name: "BTQconst", argLength: 1, reg: gp1flags, asm: "BTQ", typ: "Flags", aux: "Int8"},                         // test whether bit auxint in arg0 is set, 0 <= auxint < 64
   403  		{name: "BTCQconst", argLength: 1, reg: gp11, asm: "BTCQ", resultInArg0: true, clobberFlags: true, aux: "Int8"}, // complement bit auxint in arg0, 31 <= auxint < 64
   404  		{name: "BTRQconst", argLength: 1, reg: gp11, asm: "BTRQ", resultInArg0: true, clobberFlags: true, aux: "Int8"}, // reset bit auxint in arg0, 31 <= auxint < 64
   405  		{name: "BTSQconst", argLength: 1, reg: gp11, asm: "BTSQ", resultInArg0: true, clobberFlags: true, aux: "Int8"}, // set bit auxint in arg0, 31 <= auxint < 64
   406  
   407  		// BT[SRC]Qconstmodify
   408  		//
   409  		//  S: set bit
   410  		//  R: reset (clear) bit
   411  		//  C: complement bit
   412  		//
   413  		// Apply operation to bit ValAndOff(AuxInt).Val() in the 64 bits at
   414  		// memory address arg0+ValAndOff(AuxInt).Off()+aux
   415  		// Bit index must be in range (31-63).
   416  		// (We use OR/AND/XOR for thinner targets and lower bit indexes.)
   417  		// arg1=mem, returns mem
   418  		//
   419  		// Note that there aren't non-const versions of these instructions.
   420  		// Well, there are such instructions, but they are slow and weird so we don't use them.
   421  		{name: "BTSQconstmodify", argLength: 2, reg: gpstoreconst, asm: "BTSQ", aux: "SymValAndOff", clobberFlags: true, faultOnNilArg0: true, symEffect: "Read,Write"},
   422  		{name: "BTRQconstmodify", argLength: 2, reg: gpstoreconst, asm: "BTRQ", aux: "SymValAndOff", clobberFlags: true, faultOnNilArg0: true, symEffect: "Read,Write"},
   423  		{name: "BTCQconstmodify", argLength: 2, reg: gpstoreconst, asm: "BTCQ", aux: "SymValAndOff", clobberFlags: true, faultOnNilArg0: true, symEffect: "Read,Write"},
   424  
   425  		// TESTx: compare (arg0 & arg1) to 0
   426  		{name: "TESTQ", argLength: 2, reg: gp2flags, commutative: true, asm: "TESTQ", typ: "Flags"},
   427  		{name: "TESTL", argLength: 2, reg: gp2flags, commutative: true, asm: "TESTL", typ: "Flags"},
   428  		{name: "TESTW", argLength: 2, reg: gp2flags, commutative: true, asm: "TESTW", typ: "Flags"},
   429  		{name: "TESTB", argLength: 2, reg: gp2flags, commutative: true, asm: "TESTB", typ: "Flags"},
   430  
   431  		// TESTxconst: compare (arg0 & auxint) to 0
   432  		{name: "TESTQconst", argLength: 1, reg: gp1flags, asm: "TESTQ", typ: "Flags", aux: "Int32"},
   433  		{name: "TESTLconst", argLength: 1, reg: gp1flags, asm: "TESTL", typ: "Flags", aux: "Int32"},
   434  		{name: "TESTWconst", argLength: 1, reg: gp1flags, asm: "TESTW", typ: "Flags", aux: "Int16"},
   435  		{name: "TESTBconst", argLength: 1, reg: gp1flags, asm: "TESTB", typ: "Flags", aux: "Int8"},
   436  
   437  		// S{HL, HR, AR}x: shift operations
   438  		// SHL: shift left
   439  		// SHR: shift right logical (0s are shifted in from beyond the word size)
   440  		// SAR: shift right arithmetic (sign bit is shifted in from beyond the word size)
   441  		// arg0 is the value being shifted
   442  		// arg1 is the amount to shift, interpreted mod (Q=64,L=32,W=32,B=32)
   443  		// (Note: x86 is weird, the 16 and 8 byte shifts still use all 5 bits of shift amount!)
   444  		// For *const versions, use auxint instead of arg1 as the shift amount. auxint must be in the range 0 to (Q=63,L=31,W=15,B=7) inclusive.
   445  		{name: "SHLQ", argLength: 2, reg: gp21shift, asm: "SHLQ", resultInArg0: true, clobberFlags: true},
   446  		{name: "SHLL", argLength: 2, reg: gp21shift, asm: "SHLL", resultInArg0: true, clobberFlags: true},
   447  		{name: "SHLQconst", argLength: 1, reg: gp11, asm: "SHLQ", aux: "Int8", resultInArg0: true, clobberFlags: true},
   448  		{name: "SHLLconst", argLength: 1, reg: gp11, asm: "SHLL", aux: "Int8", resultInArg0: true, clobberFlags: true},
   449  
   450  		{name: "SHRQ", argLength: 2, reg: gp21shift, asm: "SHRQ", resultInArg0: true, clobberFlags: true},
   451  		{name: "SHRL", argLength: 2, reg: gp21shift, asm: "SHRL", resultInArg0: true, clobberFlags: true},
   452  		{name: "SHRW", argLength: 2, reg: gp21shift, asm: "SHRW", resultInArg0: true, clobberFlags: true},
   453  		{name: "SHRB", argLength: 2, reg: gp21shift, asm: "SHRB", resultInArg0: true, clobberFlags: true},
   454  		{name: "SHRQconst", argLength: 1, reg: gp11, asm: "SHRQ", aux: "Int8", resultInArg0: true, clobberFlags: true},
   455  		{name: "SHRLconst", argLength: 1, reg: gp11, asm: "SHRL", aux: "Int8", resultInArg0: true, clobberFlags: true},
   456  		{name: "SHRWconst", argLength: 1, reg: gp11, asm: "SHRW", aux: "Int8", resultInArg0: true, clobberFlags: true},
   457  		{name: "SHRBconst", argLength: 1, reg: gp11, asm: "SHRB", aux: "Int8", resultInArg0: true, clobberFlags: true},
   458  
   459  		{name: "SARQ", argLength: 2, reg: gp21shift, asm: "SARQ", resultInArg0: true, clobberFlags: true},
   460  		{name: "SARL", argLength: 2, reg: gp21shift, asm: "SARL", resultInArg0: true, clobberFlags: true},
   461  		{name: "SARW", argLength: 2, reg: gp21shift, asm: "SARW", resultInArg0: true, clobberFlags: true},
   462  		{name: "SARB", argLength: 2, reg: gp21shift, asm: "SARB", resultInArg0: true, clobberFlags: true},
   463  		{name: "SARQconst", argLength: 1, reg: gp11, asm: "SARQ", aux: "Int8", resultInArg0: true, clobberFlags: true},
   464  		{name: "SARLconst", argLength: 1, reg: gp11, asm: "SARL", aux: "Int8", resultInArg0: true, clobberFlags: true},
   465  		{name: "SARWconst", argLength: 1, reg: gp11, asm: "SARW", aux: "Int8", resultInArg0: true, clobberFlags: true},
   466  		{name: "SARBconst", argLength: 1, reg: gp11, asm: "SARB", aux: "Int8", resultInArg0: true, clobberFlags: true},
   467  
   468  		// unsigned arg0 >> arg2, shifting in bits from arg1 (==(arg1<<64+arg0)>>arg2, keeping low 64 bits), shift amount is mod 64
   469  		{name: "SHRDQ", argLength: 3, reg: gp31shift, asm: "SHRQ", resultInArg0: true, clobberFlags: true},
   470  		// unsigned arg0 << arg2, shifting in bits from arg1 (==(arg0<<64+arg1)<<arg2, keeping high 64 bits), shift amount is mod 64
   471  		{name: "SHLDQ", argLength: 3, reg: gp31shift, asm: "SHLQ", resultInArg0: true, clobberFlags: true},
   472  
   473  		// RO{L,R}x: rotate instructions
   474  		// computes arg0 rotate (L=left,R=right) arg1 bits.
   475  		// Bits are rotated within the low (Q=64,L=32,W=16,B=8) bits of the register.
   476  		// For *const versions use auxint instead of arg1 as the rotate amount. auxint must be in the range 0 to (Q=63,L=31,W=15,B=7) inclusive.
   477  		// x==L versions zero the upper 32 bits of the destination register.
   478  		// x==W and x==B versions leave the upper bits unspecified.
   479  		{name: "ROLQ", argLength: 2, reg: gp21shift, asm: "ROLQ", resultInArg0: true, clobberFlags: true},
   480  		{name: "ROLL", argLength: 2, reg: gp21shift, asm: "ROLL", resultInArg0: true, clobberFlags: true},
   481  		{name: "ROLW", argLength: 2, reg: gp21shift, asm: "ROLW", resultInArg0: true, clobberFlags: true},
   482  		{name: "ROLB", argLength: 2, reg: gp21shift, asm: "ROLB", resultInArg0: true, clobberFlags: true},
   483  		{name: "RORQ", argLength: 2, reg: gp21shift, asm: "RORQ", resultInArg0: true, clobberFlags: true},
   484  		{name: "RORL", argLength: 2, reg: gp21shift, asm: "RORL", resultInArg0: true, clobberFlags: true},
   485  		{name: "RORW", argLength: 2, reg: gp21shift, asm: "RORW", resultInArg0: true, clobberFlags: true},
   486  		{name: "RORB", argLength: 2, reg: gp21shift, asm: "RORB", resultInArg0: true, clobberFlags: true},
   487  		{name: "ROLQconst", argLength: 1, reg: gp11, asm: "ROLQ", aux: "Int8", resultInArg0: true, clobberFlags: true},
   488  		{name: "ROLLconst", argLength: 1, reg: gp11, asm: "ROLL", aux: "Int8", resultInArg0: true, clobberFlags: true},
   489  		{name: "ROLWconst", argLength: 1, reg: gp11, asm: "ROLW", aux: "Int8", resultInArg0: true, clobberFlags: true},
   490  		{name: "ROLBconst", argLength: 1, reg: gp11, asm: "ROLB", aux: "Int8", resultInArg0: true, clobberFlags: true},
   491  
   492  		// [ADD,SUB,AND,OR]xload: integer load/op combo
   493  		// L = int32, Q = int64
   494  		// x==L operations zero the upper 4 bytes of the destination register.
   495  		// computes arg0 op *(arg1+auxint+aux), arg2=mem
   496  		{name: "ADDLload", argLength: 3, reg: gp21load, asm: "ADDL", aux: "SymOff", resultInArg0: true, clobberFlags: true, faultOnNilArg1: true, symEffect: "Read"},
   497  		{name: "ADDQload", argLength: 3, reg: gp21load, asm: "ADDQ", aux: "SymOff", resultInArg0: true, clobberFlags: true, faultOnNilArg1: true, symEffect: "Read"},
   498  		{name: "SUBQload", argLength: 3, reg: gp21load, asm: "SUBQ", aux: "SymOff", resultInArg0: true, clobberFlags: true, faultOnNilArg1: true, symEffect: "Read"},
   499  		{name: "SUBLload", argLength: 3, reg: gp21load, asm: "SUBL", aux: "SymOff", resultInArg0: true, clobberFlags: true, faultOnNilArg1: true, symEffect: "Read"},
   500  		{name: "ANDLload", argLength: 3, reg: gp21load, asm: "ANDL", aux: "SymOff", resultInArg0: true, clobberFlags: true, faultOnNilArg1: true, symEffect: "Read"},
   501  		{name: "ANDQload", argLength: 3, reg: gp21load, asm: "ANDQ", aux: "SymOff", resultInArg0: true, clobberFlags: true, faultOnNilArg1: true, symEffect: "Read"},
   502  		{name: "ORQload", argLength: 3, reg: gp21load, asm: "ORQ", aux: "SymOff", resultInArg0: true, clobberFlags: true, faultOnNilArg1: true, symEffect: "Read"},
   503  		{name: "ORLload", argLength: 3, reg: gp21load, asm: "ORL", aux: "SymOff", resultInArg0: true, clobberFlags: true, faultOnNilArg1: true, symEffect: "Read"},
   504  		{name: "XORQload", argLength: 3, reg: gp21load, asm: "XORQ", aux: "SymOff", resultInArg0: true, clobberFlags: true, faultOnNilArg1: true, symEffect: "Read"},
   505  		{name: "XORLload", argLength: 3, reg: gp21load, asm: "XORL", aux: "SymOff", resultInArg0: true, clobberFlags: true, faultOnNilArg1: true, symEffect: "Read"},
   506  
   507  		// integer indexed load/op combo
   508  		// L = int32, Q = int64
   509  		// L operations zero the upper 4 bytes of the destination register.
   510  		// computes arg0 op *(arg1+scale*arg2+auxint+aux), arg3=mem
   511  		{name: "ADDLloadidx1", argLength: 4, reg: gp21loadidx, asm: "ADDL", scale: 1, aux: "SymOff", resultInArg0: true, clobberFlags: true, symEffect: "Read"},
   512  		{name: "ADDLloadidx4", argLength: 4, reg: gp21loadidx, asm: "ADDL", scale: 4, aux: "SymOff", resultInArg0: true, clobberFlags: true, symEffect: "Read"},
   513  		{name: "ADDLloadidx8", argLength: 4, reg: gp21loadidx, asm: "ADDL", scale: 8, aux: "SymOff", resultInArg0: true, clobberFlags: true, symEffect: "Read"},
   514  		{name: "ADDQloadidx1", argLength: 4, reg: gp21loadidx, asm: "ADDQ", scale: 1, aux: "SymOff", resultInArg0: true, clobberFlags: true, symEffect: "Read"},
   515  		{name: "ADDQloadidx8", argLength: 4, reg: gp21loadidx, asm: "ADDQ", scale: 8, aux: "SymOff", resultInArg0: true, clobberFlags: true, symEffect: "Read"},
   516  		{name: "SUBLloadidx1", argLength: 4, reg: gp21loadidx, asm: "SUBL", scale: 1, aux: "SymOff", resultInArg0: true, clobberFlags: true, symEffect: "Read"},
   517  		{name: "SUBLloadidx4", argLength: 4, reg: gp21loadidx, asm: "SUBL", scale: 4, aux: "SymOff", resultInArg0: true, clobberFlags: true, symEffect: "Read"},
   518  		{name: "SUBLloadidx8", argLength: 4, reg: gp21loadidx, asm: "SUBL", scale: 8, aux: "SymOff", resultInArg0: true, clobberFlags: true, symEffect: "Read"},
   519  		{name: "SUBQloadidx1", argLength: 4, reg: gp21loadidx, asm: "SUBQ", scale: 1, aux: "SymOff", resultInArg0: true, clobberFlags: true, symEffect: "Read"},
   520  		{name: "SUBQloadidx8", argLength: 4, reg: gp21loadidx, asm: "SUBQ", scale: 8, aux: "SymOff", resultInArg0: true, clobberFlags: true, symEffect: "Read"},
   521  		{name: "ANDLloadidx1", argLength: 4, reg: gp21loadidx, asm: "ANDL", scale: 1, aux: "SymOff", resultInArg0: true, clobberFlags: true, symEffect: "Read"},
   522  		{name: "ANDLloadidx4", argLength: 4, reg: gp21loadidx, asm: "ANDL", scale: 4, aux: "SymOff", resultInArg0: true, clobberFlags: true, symEffect: "Read"},
   523  		{name: "ANDLloadidx8", argLength: 4, reg: gp21loadidx, asm: "ANDL", scale: 8, aux: "SymOff", resultInArg0: true, clobberFlags: true, symEffect: "Read"},
   524  		{name: "ANDQloadidx1", argLength: 4, reg: gp21loadidx, asm: "ANDQ", scale: 1, aux: "SymOff", resultInArg0: true, clobberFlags: true, symEffect: "Read"},
   525  		{name: "ANDQloadidx8", argLength: 4, reg: gp21loadidx, asm: "ANDQ", scale: 8, aux: "SymOff", resultInArg0: true, clobberFlags: true, symEffect: "Read"},
   526  		{name: "ORLloadidx1", argLength: 4, reg: gp21loadidx, asm: "ORL", scale: 1, aux: "SymOff", resultInArg0: true, clobberFlags: true, symEffect: "Read"},
   527  		{name: "ORLloadidx4", argLength: 4, reg: gp21loadidx, asm: "ORL", scale: 4, aux: "SymOff", resultInArg0: true, clobberFlags: true, symEffect: "Read"},
   528  		{name: "ORLloadidx8", argLength: 4, reg: gp21loadidx, asm: "ORL", scale: 8, aux: "SymOff", resultInArg0: true, clobberFlags: true, symEffect: "Read"},
   529  		{name: "ORQloadidx1", argLength: 4, reg: gp21loadidx, asm: "ORQ", scale: 1, aux: "SymOff", resultInArg0: true, clobberFlags: true, symEffect: "Read"},
   530  		{name: "ORQloadidx8", argLength: 4, reg: gp21loadidx, asm: "ORQ", scale: 8, aux: "SymOff", resultInArg0: true, clobberFlags: true, symEffect: "Read"},
   531  		{name: "XORLloadidx1", argLength: 4, reg: gp21loadidx, asm: "XORL", scale: 1, aux: "SymOff", resultInArg0: true, clobberFlags: true, symEffect: "Read"},
   532  		{name: "XORLloadidx4", argLength: 4, reg: gp21loadidx, asm: "XORL", scale: 4, aux: "SymOff", resultInArg0: true, clobberFlags: true, symEffect: "Read"},
   533  		{name: "XORLloadidx8", argLength: 4, reg: gp21loadidx, asm: "XORL", scale: 8, aux: "SymOff", resultInArg0: true, clobberFlags: true, symEffect: "Read"},
   534  		{name: "XORQloadidx1", argLength: 4, reg: gp21loadidx, asm: "XORQ", scale: 1, aux: "SymOff", resultInArg0: true, clobberFlags: true, symEffect: "Read"},
   535  		{name: "XORQloadidx8", argLength: 4, reg: gp21loadidx, asm: "XORQ", scale: 8, aux: "SymOff", resultInArg0: true, clobberFlags: true, symEffect: "Read"},
   536  
   537  		// direct binary op on memory (read-modify-write)
   538  		// L = int32, Q = int64
   539  		// does *(arg0+auxint+aux) op= arg1, arg2=mem
   540  		{name: "ADDQmodify", argLength: 3, reg: gpstore, asm: "ADDQ", aux: "SymOff", typ: "Mem", clobberFlags: true, faultOnNilArg0: true, symEffect: "Read,Write"},
   541  		{name: "SUBQmodify", argLength: 3, reg: gpstore, asm: "SUBQ", aux: "SymOff", typ: "Mem", clobberFlags: true, faultOnNilArg0: true, symEffect: "Read,Write"},
   542  		{name: "ANDQmodify", argLength: 3, reg: gpstore, asm: "ANDQ", aux: "SymOff", typ: "Mem", clobberFlags: true, faultOnNilArg0: true, symEffect: "Read,Write"},
   543  		{name: "ORQmodify", argLength: 3, reg: gpstore, asm: "ORQ", aux: "SymOff", typ: "Mem", clobberFlags: true, faultOnNilArg0: true, symEffect: "Read,Write"},
   544  		{name: "XORQmodify", argLength: 3, reg: gpstore, asm: "XORQ", aux: "SymOff", typ: "Mem", clobberFlags: true, faultOnNilArg0: true, symEffect: "Read,Write"},
   545  		{name: "ADDLmodify", argLength: 3, reg: gpstore, asm: "ADDL", aux: "SymOff", typ: "Mem", clobberFlags: true, faultOnNilArg0: true, symEffect: "Read,Write"},
   546  		{name: "SUBLmodify", argLength: 3, reg: gpstore, asm: "SUBL", aux: "SymOff", typ: "Mem", clobberFlags: true, faultOnNilArg0: true, symEffect: "Read,Write"},
   547  		{name: "ANDLmodify", argLength: 3, reg: gpstore, asm: "ANDL", aux: "SymOff", typ: "Mem", clobberFlags: true, faultOnNilArg0: true, symEffect: "Read,Write"},
   548  		{name: "ORLmodify", argLength: 3, reg: gpstore, asm: "ORL", aux: "SymOff", typ: "Mem", clobberFlags: true, faultOnNilArg0: true, symEffect: "Read,Write"},
   549  		{name: "XORLmodify", argLength: 3, reg: gpstore, asm: "XORL", aux: "SymOff", typ: "Mem", clobberFlags: true, faultOnNilArg0: true, symEffect: "Read,Write"},
   550  
   551  		// indexed direct binary op on memory.
   552  		// does *(arg0+scale*arg1+auxint+aux) op= arg2, arg3=mem
   553  		{name: "ADDQmodifyidx1", argLength: 4, reg: gpstoreidx, asm: "ADDQ", scale: 1, aux: "SymOff", typ: "Mem", clobberFlags: true, symEffect: "Read,Write"},
   554  		{name: "ADDQmodifyidx8", argLength: 4, reg: gpstoreidx, asm: "ADDQ", scale: 8, aux: "SymOff", typ: "Mem", clobberFlags: true, symEffect: "Read,Write"},
   555  		{name: "SUBQmodifyidx1", argLength: 4, reg: gpstoreidx, asm: "SUBQ", scale: 1, aux: "SymOff", typ: "Mem", clobberFlags: true, symEffect: "Read,Write"},
   556  		{name: "SUBQmodifyidx8", argLength: 4, reg: gpstoreidx, asm: "SUBQ", scale: 8, aux: "SymOff", typ: "Mem", clobberFlags: true, symEffect: "Read,Write"},
   557  		{name: "ANDQmodifyidx1", argLength: 4, reg: gpstoreidx, asm: "ANDQ", scale: 1, aux: "SymOff", typ: "Mem", clobberFlags: true, symEffect: "Read,Write"},
   558  		{name: "ANDQmodifyidx8", argLength: 4, reg: gpstoreidx, asm: "ANDQ", scale: 8, aux: "SymOff", typ: "Mem", clobberFlags: true, symEffect: "Read,Write"},
   559  		{name: "ORQmodifyidx1", argLength: 4, reg: gpstoreidx, asm: "ORQ", scale: 1, aux: "SymOff", typ: "Mem", clobberFlags: true, symEffect: "Read,Write"},
   560  		{name: "ORQmodifyidx8", argLength: 4, reg: gpstoreidx, asm: "ORQ", scale: 8, aux: "SymOff", typ: "Mem", clobberFlags: true, symEffect: "Read,Write"},
   561  		{name: "XORQmodifyidx1", argLength: 4, reg: gpstoreidx, asm: "XORQ", scale: 1, aux: "SymOff", typ: "Mem", clobberFlags: true, symEffect: "Read,Write"},
   562  		{name: "XORQmodifyidx8", argLength: 4, reg: gpstoreidx, asm: "XORQ", scale: 8, aux: "SymOff", typ: "Mem", clobberFlags: true, symEffect: "Read,Write"},
   563  		{name: "ADDLmodifyidx1", argLength: 4, reg: gpstoreidx, asm: "ADDL", scale: 1, aux: "SymOff", typ: "Mem", clobberFlags: true, symEffect: "Read,Write"},
   564  		{name: "ADDLmodifyidx4", argLength: 4, reg: gpstoreidx, asm: "ADDL", scale: 4, aux: "SymOff", typ: "Mem", clobberFlags: true, symEffect: "Read,Write"},
   565  		{name: "ADDLmodifyidx8", argLength: 4, reg: gpstoreidx, asm: "ADDL", scale: 8, aux: "SymOff", typ: "Mem", clobberFlags: true, symEffect: "Read,Write"},
   566  		{name: "SUBLmodifyidx1", argLength: 4, reg: gpstoreidx, asm: "SUBL", scale: 1, aux: "SymOff", typ: "Mem", clobberFlags: true, symEffect: "Read,Write"},
   567  		{name: "SUBLmodifyidx4", argLength: 4, reg: gpstoreidx, asm: "SUBL", scale: 4, aux: "SymOff", typ: "Mem", clobberFlags: true, symEffect: "Read,Write"},
   568  		{name: "SUBLmodifyidx8", argLength: 4, reg: gpstoreidx, asm: "SUBL", scale: 8, aux: "SymOff", typ: "Mem", clobberFlags: true, symEffect: "Read,Write"},
   569  		{name: "ANDLmodifyidx1", argLength: 4, reg: gpstoreidx, asm: "ANDL", scale: 1, aux: "SymOff", typ: "Mem", clobberFlags: true, symEffect: "Read,Write"},
   570  		{name: "ANDLmodifyidx4", argLength: 4, reg: gpstoreidx, asm: "ANDL", scale: 4, aux: "SymOff", typ: "Mem", clobberFlags: true, symEffect: "Read,Write"},
   571  		{name: "ANDLmodifyidx8", argLength: 4, reg: gpstoreidx, asm: "ANDL", scale: 8, aux: "SymOff", typ: "Mem", clobberFlags: true, symEffect: "Read,Write"},
   572  		{name: "ORLmodifyidx1", argLength: 4, reg: gpstoreidx, asm: "ORL", scale: 1, aux: "SymOff", typ: "Mem", clobberFlags: true, symEffect: "Read,Write"},
   573  		{name: "ORLmodifyidx4", argLength: 4, reg: gpstoreidx, asm: "ORL", scale: 4, aux: "SymOff", typ: "Mem", clobberFlags: true, symEffect: "Read,Write"},
   574  		{name: "ORLmodifyidx8", argLength: 4, reg: gpstoreidx, asm: "ORL", scale: 8, aux: "SymOff", typ: "Mem", clobberFlags: true, symEffect: "Read,Write"},
   575  		{name: "XORLmodifyidx1", argLength: 4, reg: gpstoreidx, asm: "XORL", scale: 1, aux: "SymOff", typ: "Mem", clobberFlags: true, symEffect: "Read,Write"},
   576  		{name: "XORLmodifyidx4", argLength: 4, reg: gpstoreidx, asm: "XORL", scale: 4, aux: "SymOff", typ: "Mem", clobberFlags: true, symEffect: "Read,Write"},
   577  		{name: "XORLmodifyidx8", argLength: 4, reg: gpstoreidx, asm: "XORL", scale: 8, aux: "SymOff", typ: "Mem", clobberFlags: true, symEffect: "Read,Write"},
   578  
   579  		// indexed direct binary op on memory with constant argument.
   580  		// does *(arg0+scale*arg1+ValAndOff(AuxInt).Off()+aux) op= ValAndOff(AuxInt).Val(), arg2=mem
   581  		{name: "ADDQconstmodifyidx1", argLength: 3, reg: gpstoreconstidx, asm: "ADDQ", scale: 1, aux: "SymValAndOff", typ: "Mem", clobberFlags: true, symEffect: "Read,Write"},
   582  		{name: "ADDQconstmodifyidx8", argLength: 3, reg: gpstoreconstidx, asm: "ADDQ", scale: 8, aux: "SymValAndOff", typ: "Mem", clobberFlags: true, symEffect: "Read,Write"},
   583  		{name: "ANDQconstmodifyidx1", argLength: 3, reg: gpstoreconstidx, asm: "ANDQ", scale: 1, aux: "SymValAndOff", typ: "Mem", clobberFlags: true, symEffect: "Read,Write"},
   584  		{name: "ANDQconstmodifyidx8", argLength: 3, reg: gpstoreconstidx, asm: "ANDQ", scale: 8, aux: "SymValAndOff", typ: "Mem", clobberFlags: true, symEffect: "Read,Write"},
   585  		{name: "ORQconstmodifyidx1", argLength: 3, reg: gpstoreconstidx, asm: "ORQ", scale: 1, aux: "SymValAndOff", typ: "Mem", clobberFlags: true, symEffect: "Read,Write"},
   586  		{name: "ORQconstmodifyidx8", argLength: 3, reg: gpstoreconstidx, asm: "ORQ", scale: 8, aux: "SymValAndOff", typ: "Mem", clobberFlags: true, symEffect: "Read,Write"},
   587  		{name: "XORQconstmodifyidx1", argLength: 3, reg: gpstoreconstidx, asm: "XORQ", scale: 1, aux: "SymValAndOff", typ: "Mem", clobberFlags: true, symEffect: "Read,Write"},
   588  		{name: "XORQconstmodifyidx8", argLength: 3, reg: gpstoreconstidx, asm: "XORQ", scale: 8, aux: "SymValAndOff", typ: "Mem", clobberFlags: true, symEffect: "Read,Write"},
   589  		{name: "ADDLconstmodifyidx1", argLength: 3, reg: gpstoreconstidx, asm: "ADDL", scale: 1, aux: "SymValAndOff", typ: "Mem", clobberFlags: true, symEffect: "Read,Write"},
   590  		{name: "ADDLconstmodifyidx4", argLength: 3, reg: gpstoreconstidx, asm: "ADDL", scale: 4, aux: "SymValAndOff", typ: "Mem", clobberFlags: true, symEffect: "Read,Write"},
   591  		{name: "ADDLconstmodifyidx8", argLength: 3, reg: gpstoreconstidx, asm: "ADDL", scale: 8, aux: "SymValAndOff", typ: "Mem", clobberFlags: true, symEffect: "Read,Write"},
   592  		{name: "ANDLconstmodifyidx1", argLength: 3, reg: gpstoreconstidx, asm: "ANDL", scale: 1, aux: "SymValAndOff", typ: "Mem", clobberFlags: true, symEffect: "Read,Write"},
   593  		{name: "ANDLconstmodifyidx4", argLength: 3, reg: gpstoreconstidx, asm: "ANDL", scale: 4, aux: "SymValAndOff", typ: "Mem", clobberFlags: true, symEffect: "Read,Write"},
   594  		{name: "ANDLconstmodifyidx8", argLength: 3, reg: gpstoreconstidx, asm: "ANDL", scale: 8, aux: "SymValAndOff", typ: "Mem", clobberFlags: true, symEffect: "Read,Write"},
   595  		{name: "ORLconstmodifyidx1", argLength: 3, reg: gpstoreconstidx, asm: "ORL", scale: 1, aux: "SymValAndOff", typ: "Mem", clobberFlags: true, symEffect: "Read,Write"},
   596  		{name: "ORLconstmodifyidx4", argLength: 3, reg: gpstoreconstidx, asm: "ORL", scale: 4, aux: "SymValAndOff", typ: "Mem", clobberFlags: true, symEffect: "Read,Write"},
   597  		{name: "ORLconstmodifyidx8", argLength: 3, reg: gpstoreconstidx, asm: "ORL", scale: 8, aux: "SymValAndOff", typ: "Mem", clobberFlags: true, symEffect: "Read,Write"},
   598  		{name: "XORLconstmodifyidx1", argLength: 3, reg: gpstoreconstidx, asm: "XORL", scale: 1, aux: "SymValAndOff", typ: "Mem", clobberFlags: true, symEffect: "Read,Write"},
   599  		{name: "XORLconstmodifyidx4", argLength: 3, reg: gpstoreconstidx, asm: "XORL", scale: 4, aux: "SymValAndOff", typ: "Mem", clobberFlags: true, symEffect: "Read,Write"},
   600  		{name: "XORLconstmodifyidx8", argLength: 3, reg: gpstoreconstidx, asm: "XORL", scale: 8, aux: "SymValAndOff", typ: "Mem", clobberFlags: true, symEffect: "Read,Write"},
   601  
   602  		// {NEG,NOT}x: unary ops
   603  		// computes [NEG:-,NOT:^]arg0
   604  		// L = int32, Q = int64
   605  		// L operations zero the upper 4 bytes of the destination register.
   606  		{name: "NEGQ", argLength: 1, reg: gp11, asm: "NEGQ", resultInArg0: true, clobberFlags: true},
   607  		{name: "NEGL", argLength: 1, reg: gp11, asm: "NEGL", resultInArg0: true, clobberFlags: true},
   608  		{name: "NOTQ", argLength: 1, reg: gp11, asm: "NOTQ", resultInArg0: true},
   609  		{name: "NOTL", argLength: 1, reg: gp11, asm: "NOTL", resultInArg0: true},
   610  
   611  		// BS{F,R}Q returns a tuple [result, flags]
   612  		// result is undefined if the input is zero.
   613  		// flags are set to "equal" if the input is zero, "not equal" otherwise.
   614  		// BS{F,R}L returns only the result.
   615  		{name: "BSFQ", argLength: 1, reg: gp11flags, asm: "BSFQ", typ: "(UInt64,Flags)"},        // # of low-order zeroes in 64-bit arg
   616  		{name: "BSFL", argLength: 1, reg: gp11, asm: "BSFL", typ: "UInt32", clobberFlags: true}, // # of low-order zeroes in 32-bit arg
   617  		{name: "BSRQ", argLength: 1, reg: gp11flags, asm: "BSRQ", typ: "(UInt64,Flags)"},        // # of high-order zeroes in 64-bit arg
   618  		{name: "BSRL", argLength: 1, reg: gp11, asm: "BSRL", typ: "UInt32", clobberFlags: true}, // # of high-order zeroes in 32-bit arg
   619  
   620  		// CMOV instructions: 64, 32 and 16-bit sizes.
   621  		// if arg2 encodes a true result, return arg1, else arg0
   622  		{name: "CMOVQEQ", argLength: 3, reg: gp21, asm: "CMOVQEQ", resultInArg0: true},
   623  		{name: "CMOVQNE", argLength: 3, reg: gp21, asm: "CMOVQNE", resultInArg0: true},
   624  		{name: "CMOVQLT", argLength: 3, reg: gp21, asm: "CMOVQLT", resultInArg0: true},
   625  		{name: "CMOVQGT", argLength: 3, reg: gp21, asm: "CMOVQGT", resultInArg0: true},
   626  		{name: "CMOVQLE", argLength: 3, reg: gp21, asm: "CMOVQLE", resultInArg0: true},
   627  		{name: "CMOVQGE", argLength: 3, reg: gp21, asm: "CMOVQGE", resultInArg0: true},
   628  		{name: "CMOVQLS", argLength: 3, reg: gp21, asm: "CMOVQLS", resultInArg0: true},
   629  		{name: "CMOVQHI", argLength: 3, reg: gp21, asm: "CMOVQHI", resultInArg0: true},
   630  		{name: "CMOVQCC", argLength: 3, reg: gp21, asm: "CMOVQCC", resultInArg0: true},
   631  		{name: "CMOVQCS", argLength: 3, reg: gp21, asm: "CMOVQCS", resultInArg0: true},
   632  
   633  		{name: "CMOVLEQ", argLength: 3, reg: gp21, asm: "CMOVLEQ", resultInArg0: true},
   634  		{name: "CMOVLNE", argLength: 3, reg: gp21, asm: "CMOVLNE", resultInArg0: true},
   635  		{name: "CMOVLLT", argLength: 3, reg: gp21, asm: "CMOVLLT", resultInArg0: true},
   636  		{name: "CMOVLGT", argLength: 3, reg: gp21, asm: "CMOVLGT", resultInArg0: true},
   637  		{name: "CMOVLLE", argLength: 3, reg: gp21, asm: "CMOVLLE", resultInArg0: true},
   638  		{name: "CMOVLGE", argLength: 3, reg: gp21, asm: "CMOVLGE", resultInArg0: true},
   639  		{name: "CMOVLLS", argLength: 3, reg: gp21, asm: "CMOVLLS", resultInArg0: true},
   640  		{name: "CMOVLHI", argLength: 3, reg: gp21, asm: "CMOVLHI", resultInArg0: true},
   641  		{name: "CMOVLCC", argLength: 3, reg: gp21, asm: "CMOVLCC", resultInArg0: true},
   642  		{name: "CMOVLCS", argLength: 3, reg: gp21, asm: "CMOVLCS", resultInArg0: true},
   643  
   644  		{name: "CMOVWEQ", argLength: 3, reg: gp21, asm: "CMOVWEQ", resultInArg0: true},
   645  		{name: "CMOVWNE", argLength: 3, reg: gp21, asm: "CMOVWNE", resultInArg0: true},
   646  		{name: "CMOVWLT", argLength: 3, reg: gp21, asm: "CMOVWLT", resultInArg0: true},
   647  		{name: "CMOVWGT", argLength: 3, reg: gp21, asm: "CMOVWGT", resultInArg0: true},
   648  		{name: "CMOVWLE", argLength: 3, reg: gp21, asm: "CMOVWLE", resultInArg0: true},
   649  		{name: "CMOVWGE", argLength: 3, reg: gp21, asm: "CMOVWGE", resultInArg0: true},
   650  		{name: "CMOVWLS", argLength: 3, reg: gp21, asm: "CMOVWLS", resultInArg0: true},
   651  		{name: "CMOVWHI", argLength: 3, reg: gp21, asm: "CMOVWHI", resultInArg0: true},
   652  		{name: "CMOVWCC", argLength: 3, reg: gp21, asm: "CMOVWCC", resultInArg0: true},
   653  		{name: "CMOVWCS", argLength: 3, reg: gp21, asm: "CMOVWCS", resultInArg0: true},
   654  
   655  		// CMOV with floating point instructions. We need separate pseudo-op to handle
   656  		// InvertFlags correctly, and to generate special code that handles NaN (unordered flag).
   657  		// NOTE: the fact that CMOV*EQF here is marked to generate CMOV*NE is not a bug. See
   658  		// code generation in amd64/ssa.go.
   659  		{name: "CMOVQEQF", argLength: 3, reg: gp21, asm: "CMOVQNE", resultInArg0: true, needIntTemp: true},
   660  		{name: "CMOVQNEF", argLength: 3, reg: gp21, asm: "CMOVQNE", resultInArg0: true},
   661  		{name: "CMOVQGTF", argLength: 3, reg: gp21, asm: "CMOVQHI", resultInArg0: true},
   662  		{name: "CMOVQGEF", argLength: 3, reg: gp21, asm: "CMOVQCC", resultInArg0: true},
   663  		{name: "CMOVLEQF", argLength: 3, reg: gp21, asm: "CMOVLNE", resultInArg0: true, needIntTemp: true},
   664  		{name: "CMOVLNEF", argLength: 3, reg: gp21, asm: "CMOVLNE", resultInArg0: true},
   665  		{name: "CMOVLGTF", argLength: 3, reg: gp21, asm: "CMOVLHI", resultInArg0: true},
   666  		{name: "CMOVLGEF", argLength: 3, reg: gp21, asm: "CMOVLCC", resultInArg0: true},
   667  		{name: "CMOVWEQF", argLength: 3, reg: gp21, asm: "CMOVWNE", resultInArg0: true, needIntTemp: true},
   668  		{name: "CMOVWNEF", argLength: 3, reg: gp21, asm: "CMOVWNE", resultInArg0: true},
   669  		{name: "CMOVWGTF", argLength: 3, reg: gp21, asm: "CMOVWHI", resultInArg0: true},
   670  		{name: "CMOVWGEF", argLength: 3, reg: gp21, asm: "CMOVWCC", resultInArg0: true},
   671  
   672  		// BSWAPx swaps the low-order (L=4,Q=8) bytes of arg0.
   673  		// Q: abcdefgh -> hgfedcba
   674  		// L: abcdefgh -> 0000hgfe (L zeros the upper 4 bytes)
   675  		{name: "BSWAPQ", argLength: 1, reg: gp11, asm: "BSWAPQ", resultInArg0: true},
   676  		{name: "BSWAPL", argLength: 1, reg: gp11, asm: "BSWAPL", resultInArg0: true},
   677  
   678  		// POPCNTx counts the number of set bits in the low-order (L=32,Q=64) bits of arg0.
   679  		// POPCNTx instructions are only guaranteed to be available if GOAMD64>=v2.
   680  		// For GOAMD64<v2, any use must be preceded by a successful runtime check of runtime.x86HasPOPCNT.
   681  		{name: "POPCNTQ", argLength: 1, reg: gp11, asm: "POPCNTQ", clobberFlags: true},
   682  		{name: "POPCNTL", argLength: 1, reg: gp11, asm: "POPCNTL", clobberFlags: true},
   683  
   684  		// SQRTSx computes sqrt(arg0)
   685  		// S = float32, D = float64
   686  		{name: "SQRTSD", argLength: 1, reg: fp11, asm: "SQRTSD"},
   687  		{name: "SQRTSS", argLength: 1, reg: fp11, asm: "SQRTSS"},
   688  
   689  		// ROUNDSD rounds arg0 to an integer depending on auxint
   690  		// 0 means math.RoundToEven, 1 means math.Floor, 2 math.Ceil, 3 math.Trunc
   691  		// (The result is still a float64.)
   692  		// ROUNDSD instruction is only guaraneteed to be available if GOAMD64>=v2.
   693  		// For GOAMD64<v2, any use must be preceded by a successful check of runtime.x86HasSSE41.
   694  		{name: "ROUNDSD", argLength: 1, reg: fp11, aux: "Int8", asm: "ROUNDSD"},
   695  
   696  		// VFMADD231SD only exists on platforms with the FMA3 instruction set.
   697  		// Any use must be preceded by a successful check of runtime.support_fma.
   698  		{name: "VFMADD231SD", argLength: 3, reg: fp31, resultInArg0: true, asm: "VFMADD231SD"},
   699  
   700  		// Note that these operations don't exactly match the semantics of Go's
   701  		// builtin min. In particular, these aren't commutative, because on various
   702  		// special cases the 2nd argument is preferred.
   703  		{name: "MINSD", argLength: 2, reg: fp21, resultInArg0: true, asm: "MINSD"}, // min(arg0,arg1)
   704  		{name: "MINSS", argLength: 2, reg: fp21, resultInArg0: true, asm: "MINSS"}, // min(arg0,arg1)
   705  
   706  		{name: "SBBQcarrymask", argLength: 1, reg: flagsgp, asm: "SBBQ"}, // (int64)(-1) if carry is set, 0 if carry is clear.
   707  		{name: "SBBLcarrymask", argLength: 1, reg: flagsgp, asm: "SBBL"}, // (int32)(-1) if carry is set, 0 if carry is clear.
   708  		// Note: SBBW and SBBB are subsumed by SBBL
   709  
   710  		{name: "SETEQ", argLength: 1, reg: readflags, asm: "SETEQ"}, // extract == condition from arg0
   711  		{name: "SETNE", argLength: 1, reg: readflags, asm: "SETNE"}, // extract != condition from arg0
   712  		{name: "SETL", argLength: 1, reg: readflags, asm: "SETLT"},  // extract signed < condition from arg0
   713  		{name: "SETLE", argLength: 1, reg: readflags, asm: "SETLE"}, // extract signed <= condition from arg0
   714  		{name: "SETG", argLength: 1, reg: readflags, asm: "SETGT"},  // extract signed > condition from arg0
   715  		{name: "SETGE", argLength: 1, reg: readflags, asm: "SETGE"}, // extract signed >= condition from arg0
   716  		{name: "SETB", argLength: 1, reg: readflags, asm: "SETCS"},  // extract unsigned < condition from arg0
   717  		{name: "SETBE", argLength: 1, reg: readflags, asm: "SETLS"}, // extract unsigned <= condition from arg0
   718  		{name: "SETA", argLength: 1, reg: readflags, asm: "SETHI"},  // extract unsigned > condition from arg0
   719  		{name: "SETAE", argLength: 1, reg: readflags, asm: "SETCC"}, // extract unsigned >= condition from arg0
   720  		{name: "SETO", argLength: 1, reg: readflags, asm: "SETOS"},  // extract if overflow flag is set from arg0
   721  		// Variants that store result to memory
   722  		{name: "SETEQstore", argLength: 3, reg: gpstoreconst, asm: "SETEQ", aux: "SymOff", typ: "Mem", faultOnNilArg0: true, symEffect: "Write"},               // extract == condition from arg1 to arg0+auxint+aux, arg2=mem
   723  		{name: "SETNEstore", argLength: 3, reg: gpstoreconst, asm: "SETNE", aux: "SymOff", typ: "Mem", faultOnNilArg0: true, symEffect: "Write"},               // extract != condition from arg1 to arg0+auxint+aux, arg2=mem
   724  		{name: "SETLstore", argLength: 3, reg: gpstoreconst, asm: "SETLT", aux: "SymOff", typ: "Mem", faultOnNilArg0: true, symEffect: "Write"},                // extract signed < condition from arg1 to arg0+auxint+aux, arg2=mem
   725  		{name: "SETLEstore", argLength: 3, reg: gpstoreconst, asm: "SETLE", aux: "SymOff", typ: "Mem", faultOnNilArg0: true, symEffect: "Write"},               // extract signed <= condition from arg1 to arg0+auxint+aux, arg2=mem
   726  		{name: "SETGstore", argLength: 3, reg: gpstoreconst, asm: "SETGT", aux: "SymOff", typ: "Mem", faultOnNilArg0: true, symEffect: "Write"},                // extract signed > condition from arg1 to arg0+auxint+aux, arg2=mem
   727  		{name: "SETGEstore", argLength: 3, reg: gpstoreconst, asm: "SETGE", aux: "SymOff", typ: "Mem", faultOnNilArg0: true, symEffect: "Write"},               // extract signed >= condition from arg1 to arg0+auxint+aux, arg2=mem
   728  		{name: "SETBstore", argLength: 3, reg: gpstoreconst, asm: "SETCS", aux: "SymOff", typ: "Mem", faultOnNilArg0: true, symEffect: "Write"},                // extract unsigned < condition from arg1 to arg0+auxint+aux, arg2=mem
   729  		{name: "SETBEstore", argLength: 3, reg: gpstoreconst, asm: "SETLS", aux: "SymOff", typ: "Mem", faultOnNilArg0: true, symEffect: "Write"},               // extract unsigned <= condition from arg1 to arg0+auxint+aux, arg2=mem
   730  		{name: "SETAstore", argLength: 3, reg: gpstoreconst, asm: "SETHI", aux: "SymOff", typ: "Mem", faultOnNilArg0: true, symEffect: "Write"},                // extract unsigned > condition from arg1 to arg0+auxint+aux, arg2=mem
   731  		{name: "SETAEstore", argLength: 3, reg: gpstoreconst, asm: "SETCC", aux: "SymOff", typ: "Mem", faultOnNilArg0: true, symEffect: "Write"},               // extract unsigned >= condition from arg1 to arg0+auxint+aux, arg2=mem
   732  		{name: "SETEQstoreidx1", argLength: 4, reg: gpstoreconstidx, asm: "SETEQ", aux: "SymOff", typ: "Mem", scale: 1, commutative: true, symEffect: "Write"}, // extract == condition from arg2 to arg0+arg1+auxint+aux, arg3=mem
   733  		{name: "SETNEstoreidx1", argLength: 4, reg: gpstoreconstidx, asm: "SETNE", aux: "SymOff", typ: "Mem", scale: 1, commutative: true, symEffect: "Write"}, // extract != condition from arg2 to arg0+arg1+auxint+aux, arg3=mem
   734  		{name: "SETLstoreidx1", argLength: 4, reg: gpstoreconstidx, asm: "SETLT", aux: "SymOff", typ: "Mem", scale: 1, commutative: true, symEffect: "Write"},  // extract signed < condition from arg2 to arg0+arg1+auxint+aux, arg3=mem
   735  		{name: "SETLEstoreidx1", argLength: 4, reg: gpstoreconstidx, asm: "SETLE", aux: "SymOff", typ: "Mem", scale: 1, commutative: true, symEffect: "Write"}, // extract signed <= condition from arg2 to arg0+arg1+auxint+aux, arg3=mem
   736  		{name: "SETGstoreidx1", argLength: 4, reg: gpstoreconstidx, asm: "SETGT", aux: "SymOff", typ: "Mem", scale: 1, commutative: true, symEffect: "Write"},  // extract signed > condition from arg2 to arg0+arg1+auxint+aux, arg3=mem
   737  		{name: "SETGEstoreidx1", argLength: 4, reg: gpstoreconstidx, asm: "SETGE", aux: "SymOff", typ: "Mem", scale: 1, commutative: true, symEffect: "Write"}, // extract signed >= condition from arg2 to arg0+arg1+auxint+aux, arg3=mem
   738  		{name: "SETBstoreidx1", argLength: 4, reg: gpstoreconstidx, asm: "SETCS", aux: "SymOff", typ: "Mem", scale: 1, commutative: true, symEffect: "Write"},  // extract unsigned < condition from arg2 to arg0+arg1+auxint+aux, arg3=mem
   739  		{name: "SETBEstoreidx1", argLength: 4, reg: gpstoreconstidx, asm: "SETLS", aux: "SymOff", typ: "Mem", scale: 1, commutative: true, symEffect: "Write"}, // extract unsigned <= condition from arg2 to arg0+arg1+auxint+aux, arg3=mem
   740  		{name: "SETAstoreidx1", argLength: 4, reg: gpstoreconstidx, asm: "SETHI", aux: "SymOff", typ: "Mem", scale: 1, commutative: true, symEffect: "Write"},  // extract unsigned > condition from arg2 to arg0+arg1+auxint+aux, arg3=mem
   741  		{name: "SETAEstoreidx1", argLength: 4, reg: gpstoreconstidx, asm: "SETCC", aux: "SymOff", typ: "Mem", scale: 1, commutative: true, symEffect: "Write"}, // extract unsigned >= condition from arg2 to arg0+arg1+auxint+aux, arg3=mem
   742  
   743  		// Need different opcodes for floating point conditions because
   744  		// any comparison involving a NaN is always FALSE and thus
   745  		// the patterns for inverting conditions cannot be used.
   746  		{name: "SETEQF", argLength: 1, reg: flagsgp, asm: "SETEQ", clobberFlags: true, needIntTemp: true}, // extract == condition from arg0
   747  		{name: "SETNEF", argLength: 1, reg: flagsgp, asm: "SETNE", clobberFlags: true, needIntTemp: true}, // extract != condition from arg0
   748  		{name: "SETORD", argLength: 1, reg: flagsgp, asm: "SETPC"},                                        // extract "ordered" (No Nan present) condition from arg0
   749  		{name: "SETNAN", argLength: 1, reg: flagsgp, asm: "SETPS"},                                        // extract "unordered" (Nan present) condition from arg0
   750  
   751  		{name: "SETGF", argLength: 1, reg: flagsgp, asm: "SETHI"},  // extract floating > condition from arg0
   752  		{name: "SETGEF", argLength: 1, reg: flagsgp, asm: "SETCC"}, // extract floating >= condition from arg0
   753  
   754  		{name: "MOVBQSX", argLength: 1, reg: gp11, asm: "MOVBQSX"}, // sign extend arg0 from int8 to int64
   755  		{name: "MOVBQZX", argLength: 1, reg: gp11, asm: "MOVBLZX"}, // zero extend arg0 from int8 to int64
   756  		{name: "MOVWQSX", argLength: 1, reg: gp11, asm: "MOVWQSX"}, // sign extend arg0 from int16 to int64
   757  		{name: "MOVWQZX", argLength: 1, reg: gp11, asm: "MOVWLZX"}, // zero extend arg0 from int16 to int64
   758  		{name: "MOVLQSX", argLength: 1, reg: gp11, asm: "MOVLQSX"}, // sign extend arg0 from int32 to int64
   759  		{name: "MOVLQZX", argLength: 1, reg: gp11, asm: "MOVL"},    // zero extend arg0 from int32 to int64
   760  
   761  		{name: "MOVLconst", reg: gp01, asm: "MOVL", typ: "UInt32", aux: "Int32", rematerializeable: true}, // 32 low bits of auxint
   762  		{name: "MOVQconst", reg: gp01, asm: "MOVQ", typ: "UInt64", aux: "Int64", rematerializeable: true}, // auxint
   763  
   764  		{name: "CVTTSD2SL", argLength: 1, reg: fpgp, asm: "CVTTSD2SL"}, // convert float64 to int32
   765  		{name: "CVTTSD2SQ", argLength: 1, reg: fpgp, asm: "CVTTSD2SQ"}, // convert float64 to int64
   766  		{name: "CVTTSS2SL", argLength: 1, reg: fpgp, asm: "CVTTSS2SL"}, // convert float32 to int32
   767  		{name: "CVTTSS2SQ", argLength: 1, reg: fpgp, asm: "CVTTSS2SQ"}, // convert float32 to int64
   768  		{name: "CVTSL2SS", argLength: 1, reg: gpfp, asm: "CVTSL2SS"},   // convert int32 to float32
   769  		{name: "CVTSL2SD", argLength: 1, reg: gpfp, asm: "CVTSL2SD"},   // convert int32 to float64
   770  		{name: "CVTSQ2SS", argLength: 1, reg: gpfp, asm: "CVTSQ2SS"},   // convert int64 to float32
   771  		{name: "CVTSQ2SD", argLength: 1, reg: gpfp, asm: "CVTSQ2SD"},   // convert int64 to float64
   772  		{name: "CVTSD2SS", argLength: 1, reg: fp11, asm: "CVTSD2SS"},   // convert float64 to float32
   773  		{name: "CVTSS2SD", argLength: 1, reg: fp11, asm: "CVTSS2SD"},   // convert float32 to float64
   774  
   775  		// Move values between int and float registers, with no conversion.
   776  		// TODO: should we have generic versions of these?
   777  		{name: "MOVQi2f", argLength: 1, reg: gpfp, typ: "Float64"}, // move 64 bits from int to float reg
   778  		{name: "MOVQf2i", argLength: 1, reg: fpgp, typ: "UInt64"},  // move 64 bits from float to int reg
   779  		{name: "MOVLi2f", argLength: 1, reg: gpfp, typ: "Float32"}, // move 32 bits from int to float reg
   780  		{name: "MOVLf2i", argLength: 1, reg: fpgp, typ: "UInt32"},  // move 32 bits from float to int reg, zero extend
   781  
   782  		{name: "PXOR", argLength: 2, reg: fp21, asm: "PXOR", commutative: true, resultInArg0: true}, // exclusive or, applied to X regs (for float negation).
   783  		{name: "POR", argLength: 2, reg: fp21, asm: "POR", commutative: true, resultInArg0: true},   // inclusive or, applied to X regs (for float min/max).
   784  
   785  		{name: "LEAQ", argLength: 1, reg: gp11sb, asm: "LEAQ", aux: "SymOff", rematerializeable: true, symEffect: "Addr"}, // arg0 + auxint + offset encoded in aux
   786  		{name: "LEAL", argLength: 1, reg: gp11sb, asm: "LEAL", aux: "SymOff", rematerializeable: true, symEffect: "Addr"}, // arg0 + auxint + offset encoded in aux
   787  		{name: "LEAW", argLength: 1, reg: gp11sb, asm: "LEAW", aux: "SymOff", rematerializeable: true, symEffect: "Addr"}, // arg0 + auxint + offset encoded in aux
   788  
   789  		// LEAxn computes arg0 + n*arg1 + auxint + aux
   790  		// x==L zeroes the upper 4 bytes.
   791  		{name: "LEAQ1", argLength: 2, reg: gp21sb, asm: "LEAQ", scale: 1, commutative: true, aux: "SymOff", symEffect: "Addr"}, // arg0 + arg1 + auxint + aux
   792  		{name: "LEAL1", argLength: 2, reg: gp21sb, asm: "LEAL", scale: 1, commutative: true, aux: "SymOff", symEffect: "Addr"}, // arg0 + arg1 + auxint + aux
   793  		{name: "LEAW1", argLength: 2, reg: gp21sb, asm: "LEAW", scale: 1, commutative: true, aux: "SymOff", symEffect: "Addr"}, // arg0 + arg1 + auxint + aux
   794  		{name: "LEAQ2", argLength: 2, reg: gp21sb, asm: "LEAQ", scale: 2, aux: "SymOff", symEffect: "Addr"},                    // arg0 + 2*arg1 + auxint + aux
   795  		{name: "LEAL2", argLength: 2, reg: gp21sb, asm: "LEAL", scale: 2, aux: "SymOff", symEffect: "Addr"},                    // arg0 + 2*arg1 + auxint + aux
   796  		{name: "LEAW2", argLength: 2, reg: gp21sb, asm: "LEAW", scale: 2, aux: "SymOff", symEffect: "Addr"},                    // arg0 + 2*arg1 + auxint + aux
   797  		{name: "LEAQ4", argLength: 2, reg: gp21sb, asm: "LEAQ", scale: 4, aux: "SymOff", symEffect: "Addr"},                    // arg0 + 4*arg1 + auxint + aux
   798  		{name: "LEAL4", argLength: 2, reg: gp21sb, asm: "LEAL", scale: 4, aux: "SymOff", symEffect: "Addr"},                    // arg0 + 4*arg1 + auxint + aux
   799  		{name: "LEAW4", argLength: 2, reg: gp21sb, asm: "LEAW", scale: 4, aux: "SymOff", symEffect: "Addr"},                    // arg0 + 4*arg1 + auxint + aux
   800  		{name: "LEAQ8", argLength: 2, reg: gp21sb, asm: "LEAQ", scale: 8, aux: "SymOff", symEffect: "Addr"},                    // arg0 + 8*arg1 + auxint + aux
   801  		{name: "LEAL8", argLength: 2, reg: gp21sb, asm: "LEAL", scale: 8, aux: "SymOff", symEffect: "Addr"},                    // arg0 + 8*arg1 + auxint + aux
   802  		{name: "LEAW8", argLength: 2, reg: gp21sb, asm: "LEAW", scale: 8, aux: "SymOff", symEffect: "Addr"},                    // arg0 + 8*arg1 + auxint + aux
   803  		// Note: LEAx{1,2,4,8} must not have OpSB as either argument.
   804  
   805  		// MOVxload: loads
   806  		// Load (Q=8,L=4,W=2,B=1) bytes from (arg0+auxint+aux), arg1=mem.
   807  		// "+auxint+aux" == add auxint and the offset of the symbol in aux (if any) to the effective address
   808  		// Standard versions zero extend the result. SX versions sign extend the result.
   809  		{name: "MOVBload", argLength: 2, reg: gpload, asm: "MOVBLZX", aux: "SymOff", typ: "UInt8", faultOnNilArg0: true, symEffect: "Read"},
   810  		{name: "MOVBQSXload", argLength: 2, reg: gpload, asm: "MOVBQSX", aux: "SymOff", faultOnNilArg0: true, symEffect: "Read"},
   811  		{name: "MOVWload", argLength: 2, reg: gpload, asm: "MOVWLZX", aux: "SymOff", typ: "UInt16", faultOnNilArg0: true, symEffect: "Read"},
   812  		{name: "MOVWQSXload", argLength: 2, reg: gpload, asm: "MOVWQSX", aux: "SymOff", faultOnNilArg0: true, symEffect: "Read"},
   813  		{name: "MOVLload", argLength: 2, reg: gpload, asm: "MOVL", aux: "SymOff", typ: "UInt32", faultOnNilArg0: true, symEffect: "Read"},
   814  		{name: "MOVLQSXload", argLength: 2, reg: gpload, asm: "MOVLQSX", aux: "SymOff", faultOnNilArg0: true, symEffect: "Read"},
   815  		{name: "MOVQload", argLength: 2, reg: gpload, asm: "MOVQ", aux: "SymOff", typ: "UInt64", faultOnNilArg0: true, symEffect: "Read"},
   816  
   817  		// MOVxstore: stores
   818  		// Store (Q=8,L=4,W=2,B=1) low bytes of arg1.
   819  		// Does *(arg0+auxint+aux) = arg1, arg2=mem.
   820  		{name: "MOVBstore", argLength: 3, reg: gpstore, asm: "MOVB", aux: "SymOff", typ: "Mem", faultOnNilArg0: true, symEffect: "Write"},
   821  		{name: "MOVWstore", argLength: 3, reg: gpstore, asm: "MOVW", aux: "SymOff", typ: "Mem", faultOnNilArg0: true, symEffect: "Write"},
   822  		{name: "MOVLstore", argLength: 3, reg: gpstore, asm: "MOVL", aux: "SymOff", typ: "Mem", faultOnNilArg0: true, symEffect: "Write"},
   823  		{name: "MOVQstore", argLength: 3, reg: gpstore, asm: "MOVQ", aux: "SymOff", typ: "Mem", faultOnNilArg0: true, symEffect: "Write"},
   824  
   825  		// MOVOload/store: 16 byte load/store
   826  		// These operations are only used to move data around: there is no *O arithmetic, for example.
   827  		{name: "MOVOload", argLength: 2, reg: fpload, asm: "MOVUPS", aux: "SymOff", typ: "Int128", faultOnNilArg0: true, symEffect: "Read"}, // load 16 bytes from arg0+auxint+aux. arg1=mem
   828  		{name: "MOVOstore", argLength: 3, reg: fpstore, asm: "MOVUPS", aux: "SymOff", typ: "Mem", faultOnNilArg0: true, symEffect: "Write"}, // store 16 bytes in arg1 to arg0+auxint+aux. arg2=mem
   829  
   830  		// MOVxloadidx: indexed loads
   831  		// load (Q=8,L=4,W=2,B=1) bytes from (arg0+scale*arg1+auxint+aux), arg2=mem.
   832  		// Results are zero-extended. (TODO: sign-extending indexed loads)
   833  		{name: "MOVBloadidx1", argLength: 3, reg: gploadidx, commutative: true, asm: "MOVBLZX", scale: 1, aux: "SymOff", typ: "UInt8", symEffect: "Read"},
   834  		{name: "MOVWloadidx1", argLength: 3, reg: gploadidx, commutative: true, asm: "MOVWLZX", scale: 1, aux: "SymOff", typ: "UInt16", symEffect: "Read"},
   835  		{name: "MOVWloadidx2", argLength: 3, reg: gploadidx, asm: "MOVWLZX", scale: 2, aux: "SymOff", typ: "UInt16", symEffect: "Read"},
   836  		{name: "MOVLloadidx1", argLength: 3, reg: gploadidx, commutative: true, asm: "MOVL", scale: 1, aux: "SymOff", typ: "UInt32", symEffect: "Read"},
   837  		{name: "MOVLloadidx4", argLength: 3, reg: gploadidx, asm: "MOVL", scale: 4, aux: "SymOff", typ: "UInt32", symEffect: "Read"},
   838  		{name: "MOVLloadidx8", argLength: 3, reg: gploadidx, asm: "MOVL", scale: 8, aux: "SymOff", typ: "UInt32", symEffect: "Read"},
   839  		{name: "MOVQloadidx1", argLength: 3, reg: gploadidx, commutative: true, asm: "MOVQ", scale: 1, aux: "SymOff", typ: "UInt64", symEffect: "Read"},
   840  		{name: "MOVQloadidx8", argLength: 3, reg: gploadidx, asm: "MOVQ", scale: 8, aux: "SymOff", typ: "UInt64", symEffect: "Read"},
   841  
   842  		// MOVxstoreidx: indexed stores
   843  		// Store (Q=8,L=4,W=2,B=1) low bytes of arg2.
   844  		// Does *(arg0+scale*arg1+auxint+aux) = arg2, arg3=mem.
   845  		{name: "MOVBstoreidx1", argLength: 4, reg: gpstoreidx, commutative: true, asm: "MOVB", scale: 1, aux: "SymOff", symEffect: "Write"},
   846  		{name: "MOVWstoreidx1", argLength: 4, reg: gpstoreidx, commutative: true, asm: "MOVW", scale: 1, aux: "SymOff", symEffect: "Write"},
   847  		{name: "MOVWstoreidx2", argLength: 4, reg: gpstoreidx, asm: "MOVW", scale: 2, aux: "SymOff", symEffect: "Write"},
   848  		{name: "MOVLstoreidx1", argLength: 4, reg: gpstoreidx, commutative: true, asm: "MOVL", scale: 1, aux: "SymOff", symEffect: "Write"},
   849  		{name: "MOVLstoreidx4", argLength: 4, reg: gpstoreidx, asm: "MOVL", scale: 4, aux: "SymOff", symEffect: "Write"},
   850  		{name: "MOVLstoreidx8", argLength: 4, reg: gpstoreidx, asm: "MOVL", scale: 8, aux: "SymOff", symEffect: "Write"},
   851  		{name: "MOVQstoreidx1", argLength: 4, reg: gpstoreidx, commutative: true, asm: "MOVQ", scale: 1, aux: "SymOff", symEffect: "Write"},
   852  		{name: "MOVQstoreidx8", argLength: 4, reg: gpstoreidx, asm: "MOVQ", scale: 8, aux: "SymOff", symEffect: "Write"},
   853  
   854  		// TODO: add size-mismatched indexed loads/stores, like MOVBstoreidx4?
   855  
   856  		// MOVxstoreconst: constant stores
   857  		// Store (O=16,Q=8,L=4,W=2,B=1) constant bytes.
   858  		// Does *(arg0+ValAndOff(AuxInt).Off()+aux) = ValAndOff(AuxInt).Val(), arg1=mem.
   859  		// O version can only store the constant 0.
   860  		{name: "MOVBstoreconst", argLength: 2, reg: gpstoreconst, asm: "MOVB", aux: "SymValAndOff", typ: "Mem", faultOnNilArg0: true, symEffect: "Write"},
   861  		{name: "MOVWstoreconst", argLength: 2, reg: gpstoreconst, asm: "MOVW", aux: "SymValAndOff", typ: "Mem", faultOnNilArg0: true, symEffect: "Write"},
   862  		{name: "MOVLstoreconst", argLength: 2, reg: gpstoreconst, asm: "MOVL", aux: "SymValAndOff", typ: "Mem", faultOnNilArg0: true, symEffect: "Write"},
   863  		{name: "MOVQstoreconst", argLength: 2, reg: gpstoreconst, asm: "MOVQ", aux: "SymValAndOff", typ: "Mem", faultOnNilArg0: true, symEffect: "Write"},
   864  		{name: "MOVOstoreconst", argLength: 2, reg: gpstoreconst, asm: "MOVUPS", aux: "SymValAndOff", typ: "Mem", faultOnNilArg0: true, symEffect: "Write"},
   865  
   866  		// MOVxstoreconstidx: constant indexed stores
   867  		// Store (Q=8,L=4,W=2,B=1) constant bytes.
   868  		// Does *(arg0+scale*arg1+ValAndOff(AuxInt).Off()+aux) = ValAndOff(AuxInt).Val(), arg2=mem.
   869  		{name: "MOVBstoreconstidx1", argLength: 3, reg: gpstoreconstidx, commutative: true, asm: "MOVB", scale: 1, aux: "SymValAndOff", typ: "Mem", symEffect: "Write"},
   870  		{name: "MOVWstoreconstidx1", argLength: 3, reg: gpstoreconstidx, commutative: true, asm: "MOVW", scale: 1, aux: "SymValAndOff", typ: "Mem", symEffect: "Write"},
   871  		{name: "MOVWstoreconstidx2", argLength: 3, reg: gpstoreconstidx, asm: "MOVW", scale: 2, aux: "SymValAndOff", typ: "Mem", symEffect: "Write"},
   872  		{name: "MOVLstoreconstidx1", argLength: 3, reg: gpstoreconstidx, commutative: true, asm: "MOVL", scale: 1, aux: "SymValAndOff", typ: "Mem", symEffect: "Write"},
   873  		{name: "MOVLstoreconstidx4", argLength: 3, reg: gpstoreconstidx, asm: "MOVL", scale: 4, aux: "SymValAndOff", typ: "Mem", symEffect: "Write"},
   874  		{name: "MOVQstoreconstidx1", argLength: 3, reg: gpstoreconstidx, commutative: true, asm: "MOVQ", scale: 1, aux: "SymValAndOff", typ: "Mem", symEffect: "Write"},
   875  		{name: "MOVQstoreconstidx8", argLength: 3, reg: gpstoreconstidx, asm: "MOVQ", scale: 8, aux: "SymValAndOff", typ: "Mem", symEffect: "Write"},
   876  
   877  		// arg0 = pointer to start of memory to zero
   878  		// arg1 = mem
   879  		// auxint = # of bytes to zero
   880  		// returns mem
   881  		{
   882  			name:      "DUFFZERO",
   883  			aux:       "Int64",
   884  			argLength: 2,
   885  			reg: regInfo{
   886  				inputs:   []regMask{buildReg("DI")},
   887  				clobbers: buildReg("DI"),
   888  			},
   889  			faultOnNilArg0: true,
   890  			unsafePoint:    true, // FP maintenance around DUFFCOPY can be clobbered by interrupts
   891  		},
   892  
   893  		// arg0 = address of memory to zero
   894  		// arg1 = # of 8-byte words to zero
   895  		// arg2 = value to store (will always be zero)
   896  		// arg3 = mem
   897  		// returns mem
   898  		{
   899  			name:      "REPSTOSQ",
   900  			argLength: 4,
   901  			reg: regInfo{
   902  				inputs:   []regMask{buildReg("DI"), buildReg("CX"), buildReg("AX")},
   903  				clobbers: buildReg("DI CX"),
   904  			},
   905  			faultOnNilArg0: true,
   906  		},
   907  
   908  		// With a register ABI, the actual register info for these instructions (i.e., what is used in regalloc) is augmented with per-call-site bindings of additional arguments to specific in and out registers.
   909  		{name: "CALLstatic", argLength: -1, reg: regInfo{clobbers: callerSave}, aux: "CallOff", clobberFlags: true, call: true},                                              // call static function aux.(*obj.LSym).  last arg=mem, auxint=argsize, returns mem
   910  		{name: "CALLtail", argLength: -1, reg: regInfo{clobbers: callerSave}, aux: "CallOff", clobberFlags: true, call: true, tailCall: true},                                // tail call static function aux.(*obj.LSym).  last arg=mem, auxint=argsize, returns mem
   911  		{name: "CALLclosure", argLength: -1, reg: regInfo{inputs: []regMask{gpsp, buildReg("DX"), 0}, clobbers: callerSave}, aux: "CallOff", clobberFlags: true, call: true}, // call function via closure.  arg0=codeptr, arg1=closure, last arg=mem, auxint=argsize, returns mem
   912  		{name: "CALLinter", argLength: -1, reg: regInfo{inputs: []regMask{gp}, clobbers: callerSave}, aux: "CallOff", clobberFlags: true, call: true},                        // call fn by pointer.  arg0=codeptr, last arg=mem, auxint=argsize, returns mem
   913  
   914  		// arg0 = destination pointer
   915  		// arg1 = source pointer
   916  		// arg2 = mem
   917  		// auxint = # of bytes to copy, must be multiple of 16
   918  		// returns memory
   919  		{
   920  			name:      "DUFFCOPY",
   921  			aux:       "Int64",
   922  			argLength: 3,
   923  			reg: regInfo{
   924  				inputs:   []regMask{buildReg("DI"), buildReg("SI")},
   925  				clobbers: buildReg("DI SI X0"), // uses X0 as a temporary
   926  			},
   927  			clobberFlags:   true,
   928  			faultOnNilArg0: true,
   929  			faultOnNilArg1: true,
   930  			unsafePoint:    true, // FP maintenance around DUFFCOPY can be clobbered by interrupts
   931  		},
   932  
   933  		// arg0 = destination pointer
   934  		// arg1 = source pointer
   935  		// arg2 = # of 8-byte words to copy
   936  		// arg3 = mem
   937  		// returns memory
   938  		{
   939  			name:      "REPMOVSQ",
   940  			argLength: 4,
   941  			reg: regInfo{
   942  				inputs:   []regMask{buildReg("DI"), buildReg("SI"), buildReg("CX")},
   943  				clobbers: buildReg("DI SI CX"),
   944  			},
   945  			faultOnNilArg0: true,
   946  			faultOnNilArg1: true,
   947  		},
   948  
   949  		// (InvertFlags (CMPQ a b)) == (CMPQ b a)
   950  		// So if we want (SETL (CMPQ a b)) but we can't do that because a is a constant,
   951  		// then we do (SETL (InvertFlags (CMPQ b a))) instead.
   952  		// Rewrites will convert this to (SETG (CMPQ b a)).
   953  		// InvertFlags is a pseudo-op which can't appear in assembly output.
   954  		{name: "InvertFlags", argLength: 1}, // reverse direction of arg0
   955  
   956  		// Pseudo-ops
   957  		{name: "LoweredGetG", argLength: 1, reg: gp01}, // arg0=mem
   958  		// Scheduler ensures LoweredGetClosurePtr occurs only in entry block,
   959  		// and sorts it to the very beginning of the block to prevent other
   960  		// use of DX (the closure pointer)
   961  		{name: "LoweredGetClosurePtr", reg: regInfo{outputs: []regMask{buildReg("DX")}}, zeroWidth: true},
   962  		// LoweredGetCallerPC evaluates to the PC to which its "caller" will return.
   963  		// I.e., if f calls g "calls" sys.GetCallerPC,
   964  		// the result should be the PC within f that g will return to.
   965  		// See runtime/stubs.go for a more detailed discussion.
   966  		{name: "LoweredGetCallerPC", reg: gp01, rematerializeable: true},
   967  		// LoweredGetCallerSP returns the SP of the caller of the current function. arg0=mem
   968  		{name: "LoweredGetCallerSP", argLength: 1, reg: gp01, rematerializeable: true},
   969  		//arg0=ptr,arg1=mem, returns void.  Faults if ptr is nil.
   970  		{name: "LoweredNilCheck", argLength: 2, reg: regInfo{inputs: []regMask{gpsp}}, clobberFlags: true, nilCheck: true, faultOnNilArg0: true},
   971  		// LoweredWB invokes runtime.gcWriteBarrier{auxint}. arg0=mem, auxint=# of buffer entries needed.
   972  		// It saves all GP registers if necessary, but may clobber others.
   973  		// Returns a pointer to a write barrier buffer in R11.
   974  		{name: "LoweredWB", argLength: 1, reg: regInfo{clobbers: callerSave &^ (gp | g), outputs: []regMask{buildReg("R11")}}, clobberFlags: true, aux: "Int64"},
   975  
   976  		{name: "LoweredHasCPUFeature", argLength: 0, reg: gp01, rematerializeable: true, typ: "UInt64", aux: "Sym", symEffect: "None"},
   977  
   978  		// There are three of these functions so that they can have three different register inputs.
   979  		// When we check 0 <= c <= cap (A), then 0 <= b <= c (B), then 0 <= a <= b (C), we want the
   980  		// default registers to match so we don't need to copy registers around unnecessarily.
   981  		{name: "LoweredPanicBoundsA", argLength: 3, aux: "Int64", reg: regInfo{inputs: []regMask{dx, bx}}, typ: "Mem", call: true}, // arg0=idx, arg1=len, arg2=mem, returns memory. AuxInt contains report code (see PanicBounds in generic.go).
   982  		{name: "LoweredPanicBoundsB", argLength: 3, aux: "Int64", reg: regInfo{inputs: []regMask{cx, dx}}, typ: "Mem", call: true}, // arg0=idx, arg1=len, arg2=mem, returns memory. AuxInt contains report code (see PanicBounds in generic.go).
   983  		{name: "LoweredPanicBoundsC", argLength: 3, aux: "Int64", reg: regInfo{inputs: []regMask{ax, cx}}, typ: "Mem", call: true}, // arg0=idx, arg1=len, arg2=mem, returns memory. AuxInt contains report code (see PanicBounds in generic.go).
   984  
   985  		// Constant flag values. For any comparison, there are 5 possible
   986  		// outcomes: the three from the signed total order (<,==,>) and the
   987  		// three from the unsigned total order. The == cases overlap.
   988  		// Note: there's a sixth "unordered" outcome for floating-point
   989  		// comparisons, but we don't use such a beast yet.
   990  		// These ops are for temporary use by rewrite rules. They
   991  		// cannot appear in the generated assembly.
   992  		{name: "FlagEQ"},     // equal
   993  		{name: "FlagLT_ULT"}, // signed < and unsigned <
   994  		{name: "FlagLT_UGT"}, // signed < and unsigned >
   995  		{name: "FlagGT_UGT"}, // signed > and unsigned >
   996  		{name: "FlagGT_ULT"}, // signed > and unsigned <
   997  
   998  		// Atomic loads.  These are just normal loads but return <value,memory> tuples
   999  		// so they can be properly ordered with other loads.
  1000  		// load from arg0+auxint+aux.  arg1=mem.
  1001  		{name: "MOVBatomicload", argLength: 2, reg: gpload, asm: "MOVB", aux: "SymOff", faultOnNilArg0: true, symEffect: "Read"},
  1002  		{name: "MOVLatomicload", argLength: 2, reg: gpload, asm: "MOVL", aux: "SymOff", faultOnNilArg0: true, symEffect: "Read"},
  1003  		{name: "MOVQatomicload", argLength: 2, reg: gpload, asm: "MOVQ", aux: "SymOff", faultOnNilArg0: true, symEffect: "Read"},
  1004  
  1005  		// Atomic stores and exchanges.  Stores use XCHG to get the right memory ordering semantics.
  1006  		// store arg0 to arg1+auxint+aux, arg2=mem.
  1007  		// These ops return a tuple of <old contents of *(arg1+auxint+aux), memory>.
  1008  		// Note: arg0 and arg1 are backwards compared to MOVLstore (to facilitate resultInArg0)!
  1009  		{name: "XCHGB", argLength: 3, reg: gpstorexchg, asm: "XCHGB", aux: "SymOff", resultInArg0: true, faultOnNilArg1: true, hasSideEffects: true, symEffect: "RdWr"},
  1010  		{name: "XCHGL", argLength: 3, reg: gpstorexchg, asm: "XCHGL", aux: "SymOff", resultInArg0: true, faultOnNilArg1: true, hasSideEffects: true, symEffect: "RdWr"},
  1011  		{name: "XCHGQ", argLength: 3, reg: gpstorexchg, asm: "XCHGQ", aux: "SymOff", resultInArg0: true, faultOnNilArg1: true, hasSideEffects: true, symEffect: "RdWr"},
  1012  
  1013  		// Atomic adds.
  1014  		// *(arg1+auxint+aux) += arg0.  arg2=mem.
  1015  		// Returns a tuple of <old contents of *(arg1+auxint+aux), memory>.
  1016  		// Note: arg0 and arg1 are backwards compared to MOVLstore (to facilitate resultInArg0)!
  1017  		{name: "XADDLlock", argLength: 3, reg: gpstorexchg, asm: "XADDL", typ: "(UInt32,Mem)", aux: "SymOff", resultInArg0: true, clobberFlags: true, faultOnNilArg1: true, hasSideEffects: true, symEffect: "RdWr"},
  1018  		{name: "XADDQlock", argLength: 3, reg: gpstorexchg, asm: "XADDQ", typ: "(UInt64,Mem)", aux: "SymOff", resultInArg0: true, clobberFlags: true, faultOnNilArg1: true, hasSideEffects: true, symEffect: "RdWr"},
  1019  		{name: "AddTupleFirst32", argLength: 2}, // arg1=tuple <x,y>.  Returns <x+arg0,y>.
  1020  		{name: "AddTupleFirst64", argLength: 2}, // arg1=tuple <x,y>.  Returns <x+arg0,y>.
  1021  
  1022  		// Compare and swap.
  1023  		// arg0 = pointer, arg1 = old value, arg2 = new value, arg3 = memory.
  1024  		// if *(arg0+auxint+aux) == arg1 {
  1025  		//   *(arg0+auxint+aux) = arg2
  1026  		//   return (true, memory)
  1027  		// } else {
  1028  		//   return (false, memory)
  1029  		// }
  1030  		// Note that these instructions also return the old value in AX, but we ignore it.
  1031  		// TODO: have these return flags instead of bool.  The current system generates:
  1032  		//    CMPXCHGQ ...
  1033  		//    SETEQ AX
  1034  		//    CMPB  AX, $0
  1035  		//    JNE ...
  1036  		// instead of just
  1037  		//    CMPXCHGQ ...
  1038  		//    JEQ ...
  1039  		// but we can't do that because memory-using ops can't generate flags yet
  1040  		// (flagalloc wants to move flag-generating instructions around).
  1041  		{name: "CMPXCHGLlock", argLength: 4, reg: cmpxchg, asm: "CMPXCHGL", aux: "SymOff", clobberFlags: true, faultOnNilArg0: true, hasSideEffects: true, symEffect: "RdWr"},
  1042  		{name: "CMPXCHGQlock", argLength: 4, reg: cmpxchg, asm: "CMPXCHGQ", aux: "SymOff", clobberFlags: true, faultOnNilArg0: true, hasSideEffects: true, symEffect: "RdWr"},
  1043  
  1044  		// Atomic memory updates using logical operations.
  1045  		// Old style that just returns the memory state.
  1046  		{name: "ANDBlock", argLength: 3, reg: gpstore, asm: "ANDB", aux: "SymOff", clobberFlags: true, faultOnNilArg0: true, hasSideEffects: true, symEffect: "RdWr"}, // *(arg0+auxint+aux) &= arg1
  1047  		{name: "ANDLlock", argLength: 3, reg: gpstore, asm: "ANDL", aux: "SymOff", clobberFlags: true, faultOnNilArg0: true, hasSideEffects: true, symEffect: "RdWr"}, // *(arg0+auxint+aux) &= arg1
  1048  		{name: "ANDQlock", argLength: 3, reg: gpstore, asm: "ANDQ", aux: "SymOff", clobberFlags: true, faultOnNilArg0: true, hasSideEffects: true, symEffect: "RdWr"}, // *(arg0+auxint+aux) &= arg1
  1049  		{name: "ORBlock", argLength: 3, reg: gpstore, asm: "ORB", aux: "SymOff", clobberFlags: true, faultOnNilArg0: true, hasSideEffects: true, symEffect: "RdWr"},   // *(arg0+auxint+aux) |= arg1
  1050  		{name: "ORLlock", argLength: 3, reg: gpstore, asm: "ORL", aux: "SymOff", clobberFlags: true, faultOnNilArg0: true, hasSideEffects: true, symEffect: "RdWr"},   // *(arg0+auxint+aux) |= arg1
  1051  		{name: "ORQlock", argLength: 3, reg: gpstore, asm: "ORQ", aux: "SymOff", clobberFlags: true, faultOnNilArg0: true, hasSideEffects: true, symEffect: "RdWr"},   // *(arg0+auxint+aux) |= arg1
  1052  
  1053  		// Atomic memory updates using logical operations.
  1054  		// *(arg0+auxint+aux) op= arg1. arg2=mem.
  1055  		// New style that returns a tuple of <old contents of *(arg0+auxint+aux), memory>.
  1056  		{name: "LoweredAtomicAnd64", argLength: 3, reg: atomicLogic, resultNotInArgs: true, asm: "ANDQ", aux: "SymOff", clobberFlags: true, faultOnNilArg0: true, hasSideEffects: true, symEffect: "RdWr", unsafePoint: true, needIntTemp: true},
  1057  		{name: "LoweredAtomicAnd32", argLength: 3, reg: atomicLogic, resultNotInArgs: true, asm: "ANDL", aux: "SymOff", clobberFlags: true, faultOnNilArg0: true, hasSideEffects: true, symEffect: "RdWr", unsafePoint: true, needIntTemp: true},
  1058  		{name: "LoweredAtomicOr64", argLength: 3, reg: atomicLogic, resultNotInArgs: true, asm: "ORQ", aux: "SymOff", clobberFlags: true, faultOnNilArg0: true, hasSideEffects: true, symEffect: "RdWr", unsafePoint: true, needIntTemp: true},
  1059  		{name: "LoweredAtomicOr32", argLength: 3, reg: atomicLogic, resultNotInArgs: true, asm: "ORL", aux: "SymOff", clobberFlags: true, faultOnNilArg0: true, hasSideEffects: true, symEffect: "RdWr", unsafePoint: true, needIntTemp: true},
  1060  
  1061  		// Prefetch instructions
  1062  		// Do prefetch arg0 address. arg0=addr, arg1=memory. Instruction variant selects locality hint
  1063  		{name: "PrefetchT0", argLength: 2, reg: prefreg, asm: "PREFETCHT0", hasSideEffects: true},
  1064  		{name: "PrefetchNTA", argLength: 2, reg: prefreg, asm: "PREFETCHNTA", hasSideEffects: true},
  1065  
  1066  		// CPUID feature: BMI1.
  1067  		{name: "ANDNQ", argLength: 2, reg: gp21, asm: "ANDNQ", clobberFlags: true},         // arg0 &^ arg1
  1068  		{name: "ANDNL", argLength: 2, reg: gp21, asm: "ANDNL", clobberFlags: true},         // arg0 &^ arg1
  1069  		{name: "BLSIQ", argLength: 1, reg: gp11, asm: "BLSIQ", clobberFlags: true},         // arg0 & -arg0
  1070  		{name: "BLSIL", argLength: 1, reg: gp11, asm: "BLSIL", clobberFlags: true},         // arg0 & -arg0
  1071  		{name: "BLSMSKQ", argLength: 1, reg: gp11, asm: "BLSMSKQ", clobberFlags: true},     // arg0 ^ (arg0 - 1)
  1072  		{name: "BLSMSKL", argLength: 1, reg: gp11, asm: "BLSMSKL", clobberFlags: true},     // arg0 ^ (arg0 - 1)
  1073  		{name: "BLSRQ", argLength: 1, reg: gp11flags, asm: "BLSRQ", typ: "(UInt64,Flags)"}, // arg0 & (arg0 - 1)
  1074  		{name: "BLSRL", argLength: 1, reg: gp11flags, asm: "BLSRL", typ: "(UInt32,Flags)"}, // arg0 & (arg0 - 1)
  1075  		// count the number of trailing zero bits, prefer TZCNTQ over BSFQ, as TZCNTQ(0)==64
  1076  		// and BSFQ(0) is undefined. Same for TZCNTL(0)==32
  1077  		{name: "TZCNTQ", argLength: 1, reg: gp11, asm: "TZCNTQ", clobberFlags: true},
  1078  		{name: "TZCNTL", argLength: 1, reg: gp11, asm: "TZCNTL", clobberFlags: true},
  1079  
  1080  		// CPUID feature: LZCNT.
  1081  		// count the number of leading zero bits.
  1082  		{name: "LZCNTQ", argLength: 1, reg: gp11, asm: "LZCNTQ", typ: "UInt64", clobberFlags: true},
  1083  		{name: "LZCNTL", argLength: 1, reg: gp11, asm: "LZCNTL", typ: "UInt32", clobberFlags: true},
  1084  
  1085  		// CPUID feature: MOVBE
  1086  		// MOVBEWload does not satisfy zero extended, so only use MOVBEWstore
  1087  		{name: "MOVBEWstore", argLength: 3, reg: gpstore, asm: "MOVBEW", aux: "SymOff", typ: "Mem", faultOnNilArg0: true, symEffect: "Write"}, // swap and store 2 bytes in arg1 to arg0+auxint+aux. arg2=mem
  1088  		{name: "MOVBELload", argLength: 2, reg: gpload, asm: "MOVBEL", aux: "SymOff", typ: "UInt32", faultOnNilArg0: true, symEffect: "Read"}, // load and swap 4 bytes from arg0+auxint+aux. arg1=mem.  Zero extend.
  1089  		{name: "MOVBELstore", argLength: 3, reg: gpstore, asm: "MOVBEL", aux: "SymOff", typ: "Mem", faultOnNilArg0: true, symEffect: "Write"}, // swap and store 4 bytes in arg1 to arg0+auxint+aux. arg2=mem
  1090  		{name: "MOVBEQload", argLength: 2, reg: gpload, asm: "MOVBEQ", aux: "SymOff", typ: "UInt64", faultOnNilArg0: true, symEffect: "Read"}, // load and swap 8 bytes from arg0+auxint+aux. arg1=mem
  1091  		{name: "MOVBEQstore", argLength: 3, reg: gpstore, asm: "MOVBEQ", aux: "SymOff", typ: "Mem", faultOnNilArg0: true, symEffect: "Write"}, // swap and store 8 bytes in arg1 to arg0+auxint+aux. arg2=mem
  1092  		// indexed MOVBE loads
  1093  		{name: "MOVBELloadidx1", argLength: 3, reg: gploadidx, commutative: true, asm: "MOVBEL", scale: 1, aux: "SymOff", typ: "UInt32", symEffect: "Read"}, // load and swap 4 bytes from arg0+arg1+auxint+aux. arg2=mem. Zero extend.
  1094  		{name: "MOVBELloadidx4", argLength: 3, reg: gploadidx, asm: "MOVBEL", scale: 4, aux: "SymOff", typ: "UInt32", symEffect: "Read"},                    // load and swap 4 bytes from arg0+4*arg1+auxint+aux. arg2=mem. Zero extend.
  1095  		{name: "MOVBELloadidx8", argLength: 3, reg: gploadidx, asm: "MOVBEL", scale: 8, aux: "SymOff", typ: "UInt32", symEffect: "Read"},                    // load and swap 4 bytes from arg0+8*arg1+auxint+aux. arg2=mem. Zero extend.
  1096  		{name: "MOVBEQloadidx1", argLength: 3, reg: gploadidx, commutative: true, asm: "MOVBEQ", scale: 1, aux: "SymOff", typ: "UInt64", symEffect: "Read"}, // load and swap 8 bytes from arg0+arg1+auxint+aux. arg2=mem
  1097  		{name: "MOVBEQloadidx8", argLength: 3, reg: gploadidx, asm: "MOVBEQ", scale: 8, aux: "SymOff", typ: "UInt64", symEffect: "Read"},                    // load and swap 8 bytes from arg0+8*arg1+auxint+aux. arg2=mem
  1098  		// indexed MOVBE stores
  1099  		{name: "MOVBEWstoreidx1", argLength: 4, reg: gpstoreidx, commutative: true, asm: "MOVBEW", scale: 1, aux: "SymOff", symEffect: "Write"}, // swap and store 2 bytes in arg2 to arg0+arg1+auxint+aux. arg3=mem
  1100  		{name: "MOVBEWstoreidx2", argLength: 4, reg: gpstoreidx, asm: "MOVBEW", scale: 2, aux: "SymOff", symEffect: "Write"},                    // swap and store 2 bytes in arg2 to arg0+2*arg1+auxint+aux. arg3=mem
  1101  		{name: "MOVBELstoreidx1", argLength: 4, reg: gpstoreidx, commutative: true, asm: "MOVBEL", scale: 1, aux: "SymOff", symEffect: "Write"}, // swap and store 4 bytes in arg2 to arg0+arg1+auxint+aux. arg3=mem
  1102  		{name: "MOVBELstoreidx4", argLength: 4, reg: gpstoreidx, asm: "MOVBEL", scale: 4, aux: "SymOff", symEffect: "Write"},                    // swap and store 4 bytes in arg2 to arg0+4*arg1+auxint+aux. arg3=mem
  1103  		{name: "MOVBELstoreidx8", argLength: 4, reg: gpstoreidx, asm: "MOVBEL", scale: 8, aux: "SymOff", symEffect: "Write"},                    // swap and store 4 bytes in arg2 to arg0+8*arg1+auxint+aux. arg3=mem
  1104  		{name: "MOVBEQstoreidx1", argLength: 4, reg: gpstoreidx, commutative: true, asm: "MOVBEQ", scale: 1, aux: "SymOff", symEffect: "Write"}, // swap and store 8 bytes in arg2 to arg0+arg1+auxint+aux. arg3=mem
  1105  		{name: "MOVBEQstoreidx8", argLength: 4, reg: gpstoreidx, asm: "MOVBEQ", scale: 8, aux: "SymOff", symEffect: "Write"},                    // swap and store 8 bytes in arg2 to arg0+8*arg1+auxint+aux. arg3=mem
  1106  
  1107  		// CPUID feature: BMI2.
  1108  		{name: "SARXQ", argLength: 2, reg: gp21, asm: "SARXQ"}, // signed arg0 >> arg1, shift amount is mod 64
  1109  		{name: "SARXL", argLength: 2, reg: gp21, asm: "SARXL"}, // signed int32(arg0) >> arg1, shift amount is mod 32
  1110  		{name: "SHLXQ", argLength: 2, reg: gp21, asm: "SHLXQ"}, // arg0 << arg1, shift amount is mod 64
  1111  		{name: "SHLXL", argLength: 2, reg: gp21, asm: "SHLXL"}, // arg0 << arg1, shift amount is mod 32
  1112  		{name: "SHRXQ", argLength: 2, reg: gp21, asm: "SHRXQ"}, // unsigned arg0 >> arg1, shift amount is mod 64
  1113  		{name: "SHRXL", argLength: 2, reg: gp21, asm: "SHRXL"}, // unsigned uint32(arg0) >> arg1, shift amount is mod 32
  1114  
  1115  		{name: "SARXLload", argLength: 3, reg: gp21shxload, asm: "SARXL", aux: "SymOff", typ: "Uint32", faultOnNilArg0: true, symEffect: "Read"}, // signed *(arg0+auxint+aux) >> arg1, arg2=mem, shift amount is mod 32
  1116  		{name: "SARXQload", argLength: 3, reg: gp21shxload, asm: "SARXQ", aux: "SymOff", typ: "Uint64", faultOnNilArg0: true, symEffect: "Read"}, // signed *(arg0+auxint+aux) >> arg1, arg2=mem, shift amount is mod 64
  1117  		{name: "SHLXLload", argLength: 3, reg: gp21shxload, asm: "SHLXL", aux: "SymOff", typ: "Uint32", faultOnNilArg0: true, symEffect: "Read"}, // *(arg0+auxint+aux) << arg1, arg2=mem, shift amount is mod 32
  1118  		{name: "SHLXQload", argLength: 3, reg: gp21shxload, asm: "SHLXQ", aux: "SymOff", typ: "Uint64", faultOnNilArg0: true, symEffect: "Read"}, // *(arg0+auxint+aux) << arg1, arg2=mem, shift amount is mod 64
  1119  		{name: "SHRXLload", argLength: 3, reg: gp21shxload, asm: "SHRXL", aux: "SymOff", typ: "Uint32", faultOnNilArg0: true, symEffect: "Read"}, // unsigned *(arg0+auxint+aux) >> arg1, arg2=mem, shift amount is mod 32
  1120  		{name: "SHRXQload", argLength: 3, reg: gp21shxload, asm: "SHRXQ", aux: "SymOff", typ: "Uint64", faultOnNilArg0: true, symEffect: "Read"}, // unsigned *(arg0+auxint+aux) >> arg1, arg2=mem, shift amount is mod 64
  1121  
  1122  		{name: "SARXLloadidx1", argLength: 4, reg: gp21shxloadidx, asm: "SARXL", scale: 1, aux: "SymOff", typ: "Uint32", faultOnNilArg0: true, symEffect: "Read"}, // signed *(arg0+1*arg1+auxint+aux) >> arg2, arg3=mem, shift amount is mod 32
  1123  		{name: "SARXLloadidx4", argLength: 4, reg: gp21shxloadidx, asm: "SARXL", scale: 4, aux: "SymOff", typ: "Uint32", faultOnNilArg0: true, symEffect: "Read"}, // signed *(arg0+4*arg1+auxint+aux) >> arg2, arg3=mem, shift amount is mod 32
  1124  		{name: "SARXLloadidx8", argLength: 4, reg: gp21shxloadidx, asm: "SARXL", scale: 8, aux: "SymOff", typ: "Uint32", faultOnNilArg0: true, symEffect: "Read"}, // signed *(arg0+8*arg1+auxint+aux) >> arg2, arg3=mem, shift amount is mod 32
  1125  		{name: "SARXQloadidx1", argLength: 4, reg: gp21shxloadidx, asm: "SARXQ", scale: 1, aux: "SymOff", typ: "Uint64", faultOnNilArg0: true, symEffect: "Read"}, // signed *(arg0+1*arg1+auxint+aux) >> arg2, arg3=mem, shift amount is mod 64
  1126  		{name: "SARXQloadidx8", argLength: 4, reg: gp21shxloadidx, asm: "SARXQ", scale: 8, aux: "SymOff", typ: "Uint64", faultOnNilArg0: true, symEffect: "Read"}, // signed *(arg0+8*arg1+auxint+aux) >> arg2, arg3=mem, shift amount is mod 64
  1127  		{name: "SHLXLloadidx1", argLength: 4, reg: gp21shxloadidx, asm: "SHLXL", scale: 1, aux: "SymOff", typ: "Uint32", faultOnNilArg0: true, symEffect: "Read"}, // *(arg0+1*arg1+auxint+aux) << arg2, arg3=mem, shift amount is mod 32
  1128  		{name: "SHLXLloadidx4", argLength: 4, reg: gp21shxloadidx, asm: "SHLXL", scale: 4, aux: "SymOff", typ: "Uint32", faultOnNilArg0: true, symEffect: "Read"}, // *(arg0+4*arg1+auxint+aux) << arg2, arg3=mem, shift amount is mod 32
  1129  		{name: "SHLXLloadidx8", argLength: 4, reg: gp21shxloadidx, asm: "SHLXL", scale: 8, aux: "SymOff", typ: "Uint32", faultOnNilArg0: true, symEffect: "Read"}, // *(arg0+8*arg1+auxint+aux) << arg2, arg3=mem, shift amount is mod 32
  1130  		{name: "SHLXQloadidx1", argLength: 4, reg: gp21shxloadidx, asm: "SHLXQ", scale: 1, aux: "SymOff", typ: "Uint64", faultOnNilArg0: true, symEffect: "Read"}, // *(arg0+1*arg1+auxint+aux) << arg2, arg3=mem, shift amount is mod 64
  1131  		{name: "SHLXQloadidx8", argLength: 4, reg: gp21shxloadidx, asm: "SHLXQ", scale: 8, aux: "SymOff", typ: "Uint64", faultOnNilArg0: true, symEffect: "Read"}, // *(arg0+8*arg1+auxint+aux) << arg2, arg3=mem, shift amount is mod 64
  1132  		{name: "SHRXLloadidx1", argLength: 4, reg: gp21shxloadidx, asm: "SHRXL", scale: 1, aux: "SymOff", typ: "Uint32", faultOnNilArg0: true, symEffect: "Read"}, // unsigned *(arg0+1*arg1+auxint+aux) >> arg2, arg3=mem, shift amount is mod 32
  1133  		{name: "SHRXLloadidx4", argLength: 4, reg: gp21shxloadidx, asm: "SHRXL", scale: 4, aux: "SymOff", typ: "Uint32", faultOnNilArg0: true, symEffect: "Read"}, // unsigned *(arg0+4*arg1+auxint+aux) >> arg2, arg3=mem, shift amount is mod 32
  1134  		{name: "SHRXLloadidx8", argLength: 4, reg: gp21shxloadidx, asm: "SHRXL", scale: 8, aux: "SymOff", typ: "Uint32", faultOnNilArg0: true, symEffect: "Read"}, // unsigned *(arg0+8*arg1+auxint+aux) >> arg2, arg3=mem, shift amount is mod 32
  1135  		{name: "SHRXQloadidx1", argLength: 4, reg: gp21shxloadidx, asm: "SHRXQ", scale: 1, aux: "SymOff", typ: "Uint64", faultOnNilArg0: true, symEffect: "Read"}, // unsigned *(arg0+1*arg1+auxint+aux) >> arg2, arg3=mem, shift amount is mod 64
  1136  		{name: "SHRXQloadidx8", argLength: 4, reg: gp21shxloadidx, asm: "SHRXQ", scale: 8, aux: "SymOff", typ: "Uint64", faultOnNilArg0: true, symEffect: "Read"}, // unsigned *(arg0+8*arg1+auxint+aux) >> arg2, arg3=mem, shift amount is mod 64
  1137  	}
  1138  
  1139  	var AMD64blocks = []blockData{
  1140  		{name: "EQ", controls: 1},
  1141  		{name: "NE", controls: 1},
  1142  		{name: "LT", controls: 1},
  1143  		{name: "LE", controls: 1},
  1144  		{name: "GT", controls: 1},
  1145  		{name: "GE", controls: 1},
  1146  		{name: "OS", controls: 1},
  1147  		{name: "OC", controls: 1},
  1148  		{name: "ULT", controls: 1},
  1149  		{name: "ULE", controls: 1},
  1150  		{name: "UGT", controls: 1},
  1151  		{name: "UGE", controls: 1},
  1152  		{name: "EQF", controls: 1},
  1153  		{name: "NEF", controls: 1},
  1154  		{name: "ORD", controls: 1}, // FP, ordered comparison (parity zero)
  1155  		{name: "NAN", controls: 1}, // FP, unordered comparison (parity one)
  1156  
  1157  		// JUMPTABLE implements jump tables.
  1158  		// Aux is the symbol (an *obj.LSym) for the jump table.
  1159  		// control[0] is the index into the jump table.
  1160  		// control[1] is the address of the jump table (the address of the symbol stored in Aux).
  1161  		{name: "JUMPTABLE", controls: 2, aux: "Sym"},
  1162  	}
  1163  
  1164  	archs = append(archs, arch{
  1165  		name:               "AMD64",
  1166  		pkg:                "cmd/internal/obj/x86",
  1167  		genfile:            "../../amd64/ssa.go",
  1168  		ops:                AMD64ops,
  1169  		blocks:             AMD64blocks,
  1170  		regnames:           regNamesAMD64,
  1171  		ParamIntRegNames:   "AX BX CX DI SI R8 R9 R10 R11",
  1172  		ParamFloatRegNames: "X0 X1 X2 X3 X4 X5 X6 X7 X8 X9 X10 X11 X12 X13 X14",
  1173  		gpregmask:          gp,
  1174  		fpregmask:          fp,
  1175  		specialregmask:     x15,
  1176  		framepointerreg:    int8(num["BP"]),
  1177  		linkreg:            -1, // not used
  1178  	})
  1179  }
  1180  

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