WasmOps.go

     1  // Copyright 2018 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  var regNamesWasm = []string{
    10  	"R0",
    11  	"R1",
    12  	"R2",
    13  	"R3",
    14  	"R4",
    15  	"R5",
    16  	"R6",
    17  	"R7",
    18  	"R8",
    19  	"R9",
    20  	"R10",
    21  	"R11",
    22  	"R12",
    23  	"R13",
    24  	"R14",
    25  	"R15",
    26  
    27  	"F0",
    28  	"F1",
    29  	"F2",
    30  	"F3",
    31  	"F4",
    32  	"F5",
    33  	"F6",
    34  	"F7",
    35  	"F8",
    36  	"F9",
    37  	"F10",
    38  	"F11",
    39  	"F12",
    40  	"F13",
    41  	"F14",
    42  	"F15",
    43  
    44  	"F16",
    45  	"F17",
    46  	"F18",
    47  	"F19",
    48  	"F20",
    49  	"F21",
    50  	"F22",
    51  	"F23",
    52  	"F24",
    53  	"F25",
    54  	"F26",
    55  	"F27",
    56  	"F28",
    57  	"F29",
    58  	"F30",
    59  	"F31",
    60  
    61  	"SP",
    62  	"g",
    63  
    64  	// pseudo-registers
    65  	"SB",
    66  }
    67  
    68  func init() {
    69  	// Make map from reg names to reg integers.
    70  	if len(regNamesWasm) > 64 {
    71  		panic("too many registers")
    72  	}
    73  	num := map[string]int{}
    74  	for i, name := range regNamesWasm {
    75  		num[name] = i
    76  	}
    77  	buildReg := func(s string) regMask {
    78  		m := regMask(0)
    79  		for _, r := range strings.Split(s, " ") {
    80  			if n, ok := num[r]; ok {
    81  				m |= regMask(1) << uint(n)
    82  				continue
    83  			}
    84  			panic("register " + r + " not found")
    85  		}
    86  		return m
    87  	}
    88  
    89  	var (
    90  		gp     = buildReg("R0 R1 R2 R3 R4 R5 R6 R7 R8 R9 R10 R11 R12 R13 R14 R15")
    91  		fp32   = buildReg("F0 F1 F2 F3 F4 F5 F6 F7 F8 F9 F10 F11 F12 F13 F14 F15")
    92  		fp64   = buildReg("F16 F17 F18 F19 F20 F21 F22 F23 F24 F25 F26 F27 F28 F29 F30 F31")
    93  		gpsp   = gp | buildReg("SP")
    94  		gpspsb = gpsp | buildReg("SB")
    95  		// The "registers", which are actually local variables, can get clobbered
    96  		// if we're switching goroutines, because it unwinds the WebAssembly stack.
    97  		callerSave = gp | fp32 | fp64 | buildReg("g")
    98  	)
    99  
   100  	// Common regInfo
   101  	var (
   102  		gp01      = regInfo{inputs: nil, outputs: []regMask{gp}}
   103  		gp11      = regInfo{inputs: []regMask{gpsp}, outputs: []regMask{gp}}
   104  		gp21      = regInfo{inputs: []regMask{gpsp, gpsp}, outputs: []regMask{gp}}
   105  		gp31      = regInfo{inputs: []regMask{gpsp, gpsp, gpsp}, outputs: []regMask{gp}}
   106  		fp32_01   = regInfo{inputs: nil, outputs: []regMask{fp32}}
   107  		fp32_11   = regInfo{inputs: []regMask{fp32}, outputs: []regMask{fp32}}
   108  		fp32_21   = regInfo{inputs: []regMask{fp32, fp32}, outputs: []regMask{fp32}}
   109  		fp32_21gp = regInfo{inputs: []regMask{fp32, fp32}, outputs: []regMask{gp}}
   110  		fp64_01   = regInfo{inputs: nil, outputs: []regMask{fp64}}
   111  		fp64_11   = regInfo{inputs: []regMask{fp64}, outputs: []regMask{fp64}}
   112  		fp64_21   = regInfo{inputs: []regMask{fp64, fp64}, outputs: []regMask{fp64}}
   113  		fp64_21gp = regInfo{inputs: []regMask{fp64, fp64}, outputs: []regMask{gp}}
   114  		gpload    = regInfo{inputs: []regMask{gpspsb, 0}, outputs: []regMask{gp}}
   115  		gpstore   = regInfo{inputs: []regMask{gpspsb, gpsp, 0}}
   116  		fp32load  = regInfo{inputs: []regMask{gpspsb, 0}, outputs: []regMask{fp32}}
   117  		fp32store = regInfo{inputs: []regMask{gpspsb, fp32, 0}}
   118  		fp64load  = regInfo{inputs: []regMask{gpspsb, 0}, outputs: []regMask{fp64}}
   119  		fp64store = regInfo{inputs: []regMask{gpspsb, fp64, 0}}
   120  	)
   121  
   122  	var WasmOps = []opData{
   123  		{name: "LoweredStaticCall", argLength: 1, reg: regInfo{clobbers: callerSave}, aux: "CallOff", call: true},                                // call static function aux.(*obj.LSym). arg0=mem, auxint=argsize, returns mem
   124  		{name: "LoweredTailCall", argLength: 1, reg: regInfo{clobbers: callerSave}, aux: "CallOff", call: true, tailCall: true},                  // tail call static function aux.(*obj.LSym). arg0=mem, auxint=argsize, returns mem
   125  		{name: "LoweredClosureCall", argLength: 3, reg: regInfo{inputs: []regMask{gp, gp, 0}, clobbers: callerSave}, aux: "CallOff", call: true}, // call function via closure. arg0=codeptr, arg1=closure, arg2=mem, auxint=argsize, returns mem
   126  		{name: "LoweredInterCall", argLength: 2, reg: regInfo{inputs: []regMask{gp}, clobbers: callerSave}, aux: "CallOff", call: true},          // call fn by pointer. arg0=codeptr, arg1=mem, auxint=argsize, returns mem
   127  
   128  		{name: "LoweredAddr", argLength: 1, reg: gp11, aux: "SymOff", rematerializeable: true, symEffect: "Addr"}, // returns base+aux+auxint, arg0=base
   129  		{name: "LoweredMove", argLength: 3, reg: regInfo{inputs: []regMask{gp, gp}}, aux: "Int64"},                // large move. arg0=dst, arg1=src, arg2=mem, auxint=len, returns mem
   130  		{name: "LoweredZero", argLength: 2, reg: regInfo{inputs: []regMask{gp}}, aux: "Int64"},                    // large zeroing. arg0=start, arg1=mem, auxint=len, returns mem
   131  
   132  		{name: "LoweredGetClosurePtr", reg: gp01},                                                                          // returns wasm.REG_CTXT, the closure pointer
   133  		{name: "LoweredGetCallerPC", reg: gp01, rematerializeable: true},                                                   // returns the PC of the caller of the current function
   134  		{name: "LoweredGetCallerSP", argLength: 1, reg: gp01, rematerializeable: true},                                     // returns the SP of the caller of the current function. arg0=mem.
   135  		{name: "LoweredNilCheck", argLength: 2, reg: regInfo{inputs: []regMask{gp}}, nilCheck: true, faultOnNilArg0: true}, // panic if arg0 is nil. arg1=mem
   136  		{name: "LoweredWB", argLength: 1, reg: regInfo{clobbers: callerSave, outputs: []regMask{gp}}, aux: "Int64"},        // invokes runtime.gcWriteBarrier{auxint}. arg0=mem, auxint=# of buffer entries needed. Returns a pointer to a write barrier buffer.
   137  
   138  		// LoweredConvert converts between pointers and integers.
   139  		// We have a special op for this so as to not confuse GCCallOff
   140  		// (particularly stack maps). It takes a memory arg so it
   141  		// gets correctly ordered with respect to GC safepoints.
   142  		// arg0=ptr/int arg1=mem, output=int/ptr
   143  		//
   144  		// TODO(neelance): LoweredConvert should not be necessary any more, since OpConvert does not need to be lowered any more (CL 108496).
   145  		{name: "LoweredConvert", argLength: 2, reg: regInfo{inputs: []regMask{gp}, outputs: []regMask{gp}}},
   146  
   147  		// The following are native WebAssembly instructions, see https://webassembly.github.io/spec/core/syntax/instructions.html
   148  
   149  		{name: "Select", asm: "Select", argLength: 3, reg: gp31}, // returns arg0 if arg2 != 0, otherwise returns arg1
   150  
   151  		{name: "I64Load8U", asm: "I64Load8U", argLength: 2, reg: gpload, aux: "Int64", typ: "UInt8"},    // read unsigned 8-bit integer from address arg0+aux, arg1=mem
   152  		{name: "I64Load8S", asm: "I64Load8S", argLength: 2, reg: gpload, aux: "Int64", typ: "Int8"},     // read signed 8-bit integer from address arg0+aux, arg1=mem
   153  		{name: "I64Load16U", asm: "I64Load16U", argLength: 2, reg: gpload, aux: "Int64", typ: "UInt16"}, // read unsigned 16-bit integer from address arg0+aux, arg1=mem
   154  		{name: "I64Load16S", asm: "I64Load16S", argLength: 2, reg: gpload, aux: "Int64", typ: "Int16"},  // read signed 16-bit integer from address arg0+aux, arg1=mem
   155  		{name: "I64Load32U", asm: "I64Load32U", argLength: 2, reg: gpload, aux: "Int64", typ: "UInt32"}, // read unsigned 32-bit integer from address arg0+aux, arg1=mem
   156  		{name: "I64Load32S", asm: "I64Load32S", argLength: 2, reg: gpload, aux: "Int64", typ: "Int32"},  // read signed 32-bit integer from address arg0+aux, arg1=mem
   157  		{name: "I64Load", asm: "I64Load", argLength: 2, reg: gpload, aux: "Int64", typ: "UInt64"},       // read 64-bit integer from address arg0+aux, arg1=mem
   158  		{name: "I64Store8", asm: "I64Store8", argLength: 3, reg: gpstore, aux: "Int64", typ: "Mem"},     // store 8-bit integer arg1 at address arg0+aux, arg2=mem, returns mem
   159  		{name: "I64Store16", asm: "I64Store16", argLength: 3, reg: gpstore, aux: "Int64", typ: "Mem"},   // store 16-bit integer arg1 at address arg0+aux, arg2=mem, returns mem
   160  		{name: "I64Store32", asm: "I64Store32", argLength: 3, reg: gpstore, aux: "Int64", typ: "Mem"},   // store 32-bit integer arg1 at address arg0+aux, arg2=mem, returns mem
   161  		{name: "I64Store", asm: "I64Store", argLength: 3, reg: gpstore, aux: "Int64", typ: "Mem"},       // store 64-bit integer arg1 at address arg0+aux, arg2=mem, returns mem
   162  
   163  		{name: "F32Load", asm: "F32Load", argLength: 2, reg: fp32load, aux: "Int64", typ: "Float32"}, // read 32-bit float from address arg0+aux, arg1=mem
   164  		{name: "F64Load", asm: "F64Load", argLength: 2, reg: fp64load, aux: "Int64", typ: "Float64"}, // read 64-bit float from address arg0+aux, arg1=mem
   165  		{name: "F32Store", asm: "F32Store", argLength: 3, reg: fp32store, aux: "Int64", typ: "Mem"},  // store 32-bit float arg1 at address arg0+aux, arg2=mem, returns mem
   166  		{name: "F64Store", asm: "F64Store", argLength: 3, reg: fp64store, aux: "Int64", typ: "Mem"},  // store 64-bit float arg1 at address arg0+aux, arg2=mem, returns mem
   167  
   168  		{name: "I64Const", reg: gp01, aux: "Int64", rematerializeable: true, typ: "Int64"},        // returns the constant integer aux
   169  		{name: "F32Const", reg: fp32_01, aux: "Float32", rematerializeable: true, typ: "Float32"}, // returns the constant float aux
   170  		{name: "F64Const", reg: fp64_01, aux: "Float64", rematerializeable: true, typ: "Float64"}, // returns the constant float aux
   171  
   172  		{name: "I64Eqz", asm: "I64Eqz", argLength: 1, reg: gp11, typ: "Bool"}, // arg0 == 0
   173  		{name: "I64Eq", asm: "I64Eq", argLength: 2, reg: gp21, typ: "Bool"},   // arg0 == arg1
   174  		{name: "I64Ne", asm: "I64Ne", argLength: 2, reg: gp21, typ: "Bool"},   // arg0 != arg1
   175  		{name: "I64LtS", asm: "I64LtS", argLength: 2, reg: gp21, typ: "Bool"}, // arg0 < arg1 (signed)
   176  		{name: "I64LtU", asm: "I64LtU", argLength: 2, reg: gp21, typ: "Bool"}, // arg0 < arg1 (unsigned)
   177  		{name: "I64GtS", asm: "I64GtS", argLength: 2, reg: gp21, typ: "Bool"}, // arg0 > arg1 (signed)
   178  		{name: "I64GtU", asm: "I64GtU", argLength: 2, reg: gp21, typ: "Bool"}, // arg0 > arg1 (unsigned)
   179  		{name: "I64LeS", asm: "I64LeS", argLength: 2, reg: gp21, typ: "Bool"}, // arg0 <= arg1 (signed)
   180  		{name: "I64LeU", asm: "I64LeU", argLength: 2, reg: gp21, typ: "Bool"}, // arg0 <= arg1 (unsigned)
   181  		{name: "I64GeS", asm: "I64GeS", argLength: 2, reg: gp21, typ: "Bool"}, // arg0 >= arg1 (signed)
   182  		{name: "I64GeU", asm: "I64GeU", argLength: 2, reg: gp21, typ: "Bool"}, // arg0 >= arg1 (unsigned)
   183  
   184  		{name: "F32Eq", asm: "F32Eq", argLength: 2, reg: fp32_21gp, typ: "Bool"}, // arg0 == arg1
   185  		{name: "F32Ne", asm: "F32Ne", argLength: 2, reg: fp32_21gp, typ: "Bool"}, // arg0 != arg1
   186  		{name: "F32Lt", asm: "F32Lt", argLength: 2, reg: fp32_21gp, typ: "Bool"}, // arg0 < arg1
   187  		{name: "F32Gt", asm: "F32Gt", argLength: 2, reg: fp32_21gp, typ: "Bool"}, // arg0 > arg1
   188  		{name: "F32Le", asm: "F32Le", argLength: 2, reg: fp32_21gp, typ: "Bool"}, // arg0 <= arg1
   189  		{name: "F32Ge", asm: "F32Ge", argLength: 2, reg: fp32_21gp, typ: "Bool"}, // arg0 >= arg1
   190  
   191  		{name: "F64Eq", asm: "F64Eq", argLength: 2, reg: fp64_21gp, typ: "Bool"}, // arg0 == arg1
   192  		{name: "F64Ne", asm: "F64Ne", argLength: 2, reg: fp64_21gp, typ: "Bool"}, // arg0 != arg1
   193  		{name: "F64Lt", asm: "F64Lt", argLength: 2, reg: fp64_21gp, typ: "Bool"}, // arg0 < arg1
   194  		{name: "F64Gt", asm: "F64Gt", argLength: 2, reg: fp64_21gp, typ: "Bool"}, // arg0 > arg1
   195  		{name: "F64Le", asm: "F64Le", argLength: 2, reg: fp64_21gp, typ: "Bool"}, // arg0 <= arg1
   196  		{name: "F64Ge", asm: "F64Ge", argLength: 2, reg: fp64_21gp, typ: "Bool"}, // arg0 >= arg1
   197  
   198  		{name: "I64Add", asm: "I64Add", argLength: 2, reg: gp21, typ: "Int64"},                    // arg0 + arg1
   199  		{name: "I64AddConst", asm: "I64Add", argLength: 1, reg: gp11, aux: "Int64", typ: "Int64"}, // arg0 + aux
   200  		{name: "I64Sub", asm: "I64Sub", argLength: 2, reg: gp21, typ: "Int64"},                    // arg0 - arg1
   201  		{name: "I64Mul", asm: "I64Mul", argLength: 2, reg: gp21, typ: "Int64"},                    // arg0 * arg1
   202  		{name: "I64DivS", asm: "I64DivS", argLength: 2, reg: gp21, typ: "Int64"},                  // arg0 / arg1 (signed)
   203  		{name: "I64DivU", asm: "I64DivU", argLength: 2, reg: gp21, typ: "Int64"},                  // arg0 / arg1 (unsigned)
   204  		{name: "I64RemS", asm: "I64RemS", argLength: 2, reg: gp21, typ: "Int64"},                  // arg0 % arg1 (signed)
   205  		{name: "I64RemU", asm: "I64RemU", argLength: 2, reg: gp21, typ: "Int64"},                  // arg0 % arg1 (unsigned)
   206  		{name: "I64And", asm: "I64And", argLength: 2, reg: gp21, typ: "Int64"},                    // arg0 & arg1
   207  		{name: "I64Or", asm: "I64Or", argLength: 2, reg: gp21, typ: "Int64"},                      // arg0 | arg1
   208  		{name: "I64Xor", asm: "I64Xor", argLength: 2, reg: gp21, typ: "Int64"},                    // arg0 ^ arg1
   209  		{name: "I64Shl", asm: "I64Shl", argLength: 2, reg: gp21, typ: "Int64"},                    // arg0 << (arg1 % 64)
   210  		{name: "I64ShrS", asm: "I64ShrS", argLength: 2, reg: gp21, typ: "Int64"},                  // arg0 >> (arg1 % 64) (signed)
   211  		{name: "I64ShrU", asm: "I64ShrU", argLength: 2, reg: gp21, typ: "Int64"},                  // arg0 >> (arg1 % 64) (unsigned)
   212  
   213  		{name: "F32Neg", asm: "F32Neg", argLength: 1, reg: fp32_11, typ: "Float32"}, // -arg0
   214  		{name: "F32Add", asm: "F32Add", argLength: 2, reg: fp32_21, typ: "Float32"}, // arg0 + arg1
   215  		{name: "F32Sub", asm: "F32Sub", argLength: 2, reg: fp32_21, typ: "Float32"}, // arg0 - arg1
   216  		{name: "F32Mul", asm: "F32Mul", argLength: 2, reg: fp32_21, typ: "Float32"}, // arg0 * arg1
   217  		{name: "F32Div", asm: "F32Div", argLength: 2, reg: fp32_21, typ: "Float32"}, // arg0 / arg1
   218  
   219  		{name: "F64Neg", asm: "F64Neg", argLength: 1, reg: fp64_11, typ: "Float64"}, // -arg0
   220  		{name: "F64Add", asm: "F64Add", argLength: 2, reg: fp64_21, typ: "Float64"}, // arg0 + arg1
   221  		{name: "F64Sub", asm: "F64Sub", argLength: 2, reg: fp64_21, typ: "Float64"}, // arg0 - arg1
   222  		{name: "F64Mul", asm: "F64Mul", argLength: 2, reg: fp64_21, typ: "Float64"}, // arg0 * arg1
   223  		{name: "F64Div", asm: "F64Div", argLength: 2, reg: fp64_21, typ: "Float64"}, // arg0 / arg1
   224  
   225  		{name: "I64TruncSatF64S", asm: "I64TruncSatF64S", argLength: 1, reg: regInfo{inputs: []regMask{fp64}, outputs: []regMask{gp}}, typ: "Int64"}, // truncates the float arg0 to a signed integer (saturating)
   226  		{name: "I64TruncSatF64U", asm: "I64TruncSatF64U", argLength: 1, reg: regInfo{inputs: []regMask{fp64}, outputs: []regMask{gp}}, typ: "Int64"}, // truncates the float arg0 to an unsigned integer (saturating)
   227  		{name: "I64TruncSatF32S", asm: "I64TruncSatF32S", argLength: 1, reg: regInfo{inputs: []regMask{fp32}, outputs: []regMask{gp}}, typ: "Int64"}, // truncates the float arg0 to a signed integer (saturating)
   228  		{name: "I64TruncSatF32U", asm: "I64TruncSatF32U", argLength: 1, reg: regInfo{inputs: []regMask{fp32}, outputs: []regMask{gp}}, typ: "Int64"}, // truncates the float arg0 to an unsigned integer (saturating)
   229  		{name: "F32ConvertI64S", asm: "F32ConvertI64S", argLength: 1, reg: regInfo{inputs: []regMask{gp}, outputs: []regMask{fp32}}, typ: "Float32"}, // converts the signed integer arg0 to a float
   230  		{name: "F32ConvertI64U", asm: "F32ConvertI64U", argLength: 1, reg: regInfo{inputs: []regMask{gp}, outputs: []regMask{fp32}}, typ: "Float32"}, // converts the unsigned integer arg0 to a float
   231  		{name: "F64ConvertI64S", asm: "F64ConvertI64S", argLength: 1, reg: regInfo{inputs: []regMask{gp}, outputs: []regMask{fp64}}, typ: "Float64"}, // converts the signed integer arg0 to a float
   232  		{name: "F64ConvertI64U", asm: "F64ConvertI64U", argLength: 1, reg: regInfo{inputs: []regMask{gp}, outputs: []regMask{fp64}}, typ: "Float64"}, // converts the unsigned integer arg0 to a float
   233  		{name: "F32DemoteF64", asm: "F32DemoteF64", argLength: 1, reg: regInfo{inputs: []regMask{fp64}, outputs: []regMask{fp32}}, typ: "Float32"},
   234  		{name: "F64PromoteF32", asm: "F64PromoteF32", argLength: 1, reg: regInfo{inputs: []regMask{fp32}, outputs: []regMask{fp64}}, typ: "Float64"},
   235  
   236  		{name: "I64Extend8S", asm: "I64Extend8S", argLength: 1, reg: gp11, typ: "Int64"},   // sign-extend arg0 from 8 to 64 bit
   237  		{name: "I64Extend16S", asm: "I64Extend16S", argLength: 1, reg: gp11, typ: "Int64"}, // sign-extend arg0 from 16 to 64 bit
   238  		{name: "I64Extend32S", asm: "I64Extend32S", argLength: 1, reg: gp11, typ: "Int64"}, // sign-extend arg0 from 32 to 64 bit
   239  
   240  		{name: "F32Sqrt", asm: "F32Sqrt", argLength: 1, reg: fp32_11, typ: "Float32"},         // sqrt(arg0)
   241  		{name: "F32Trunc", asm: "F32Trunc", argLength: 1, reg: fp32_11, typ: "Float32"},       // trunc(arg0)
   242  		{name: "F32Ceil", asm: "F32Ceil", argLength: 1, reg: fp32_11, typ: "Float32"},         // ceil(arg0)
   243  		{name: "F32Floor", asm: "F32Floor", argLength: 1, reg: fp32_11, typ: "Float32"},       // floor(arg0)
   244  		{name: "F32Nearest", asm: "F32Nearest", argLength: 1, reg: fp32_11, typ: "Float32"},   // round(arg0)
   245  		{name: "F32Abs", asm: "F32Abs", argLength: 1, reg: fp32_11, typ: "Float32"},           // abs(arg0)
   246  		{name: "F32Copysign", asm: "F32Copysign", argLength: 2, reg: fp32_21, typ: "Float32"}, // copysign(arg0, arg1)
   247  
   248  		{name: "F64Sqrt", asm: "F64Sqrt", argLength: 1, reg: fp64_11, typ: "Float64"},         // sqrt(arg0)
   249  		{name: "F64Trunc", asm: "F64Trunc", argLength: 1, reg: fp64_11, typ: "Float64"},       // trunc(arg0)
   250  		{name: "F64Ceil", asm: "F64Ceil", argLength: 1, reg: fp64_11, typ: "Float64"},         // ceil(arg0)
   251  		{name: "F64Floor", asm: "F64Floor", argLength: 1, reg: fp64_11, typ: "Float64"},       // floor(arg0)
   252  		{name: "F64Nearest", asm: "F64Nearest", argLength: 1, reg: fp64_11, typ: "Float64"},   // round(arg0)
   253  		{name: "F64Abs", asm: "F64Abs", argLength: 1, reg: fp64_11, typ: "Float64"},           // abs(arg0)
   254  		{name: "F64Copysign", asm: "F64Copysign", argLength: 2, reg: fp64_21, typ: "Float64"}, // copysign(arg0, arg1)
   255  
   256  		{name: "I64Ctz", asm: "I64Ctz", argLength: 1, reg: gp11, typ: "Int64"},       // ctz(arg0)
   257  		{name: "I64Clz", asm: "I64Clz", argLength: 1, reg: gp11, typ: "Int64"},       // clz(arg0)
   258  		{name: "I32Rotl", asm: "I32Rotl", argLength: 2, reg: gp21, typ: "Int32"},     // rotl(arg0, arg1)
   259  		{name: "I64Rotl", asm: "I64Rotl", argLength: 2, reg: gp21, typ: "Int64"},     // rotl(arg0, arg1)
   260  		{name: "I64Popcnt", asm: "I64Popcnt", argLength: 1, reg: gp11, typ: "Int64"}, // popcnt(arg0)
   261  	}
   262  
   263  	archs = append(archs, arch{
   264  		name:            "Wasm",
   265  		pkg:             "cmd/internal/obj/wasm",
   266  		genfile:         "../../wasm/ssa.go",
   267  		ops:             WasmOps,
   268  		blocks:          nil,
   269  		regnames:        regNamesWasm,
   270  		gpregmask:       gp,
   271  		fpregmask:       fp32 | fp64,
   272  		fp32regmask:     fp32,
   273  		fp64regmask:     fp64,
   274  		framepointerreg: -1, // not used
   275  		linkreg:         -1, // not used
   276  	})
   277  }
   278
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