dim_s390x.s

     1  // Copyright 2016 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  // Based on dim_amd64.s
     6  
     7  #include "textflag.h"
     8  
     9  #define PosInf 0x7FF0000000000000
    10  #define NaN    0x7FF8000000000001
    11  #define NegInf 0xFFF0000000000000
    12  
    13  // func ·Max(x, y float64) float64
    14  TEXT ·archMax(SB),NOSPLIT,$0
    15  	// +Inf special cases
    16  	MOVD    $PosInf, R4
    17  	MOVD    x+0(FP), R8
    18  	CMPUBEQ R4, R8, isPosInf
    19  	MOVD    y+8(FP), R9
    20  	CMPUBEQ R4, R9, isPosInf
    21  	// NaN special cases
    22  	MOVD    $~(1<<63), R5 // bit mask
    23  	MOVD    $PosInf, R4
    24  	MOVD    R8, R2
    25  	AND     R5, R2 // x = |x|
    26  	CMPUBLT R4, R2, isMaxNaN
    27  	MOVD    R9, R3
    28  	AND     R5, R3 // y = |y|
    29  	CMPUBLT R4, R3, isMaxNaN
    30  	// ±0 special cases
    31  	OR      R3, R2
    32  	BEQ     isMaxZero
    33  
    34  	FMOVD   x+0(FP), F1
    35  	FMOVD   y+8(FP), F2
    36  	FCMPU   F2, F1
    37  	BGT     +3(PC)
    38  	FMOVD   F1, ret+16(FP)
    39  	RET
    40  	FMOVD   F2, ret+16(FP)
    41  	RET
    42  isMaxNaN: // return NaN
    43  	MOVD	$NaN, R4
    44  isPosInf: // return +Inf
    45  	MOVD    R4, ret+16(FP)
    46  	RET
    47  isMaxZero:
    48  	MOVD    $(1<<63), R4 // -0.0
    49  	CMPUBEQ R4, R8, +3(PC)
    50  	MOVD    R8, ret+16(FP) // return 0
    51  	RET
    52  	MOVD    R9, ret+16(FP) // return other 0
    53  	RET
    54  
    55  // func archMin(x, y float64) float64
    56  TEXT ·archMin(SB),NOSPLIT,$0
    57  	// -Inf special cases
    58  	MOVD    $NegInf, R4
    59  	MOVD    x+0(FP), R8
    60  	CMPUBEQ R4, R8, isNegInf
    61  	MOVD    y+8(FP), R9
    62  	CMPUBEQ R4, R9, isNegInf
    63  	// NaN special cases
    64  	MOVD    $~(1<<63), R5
    65  	MOVD    $PosInf, R4
    66  	MOVD    R8, R2
    67  	AND     R5, R2 // x = |x|
    68  	CMPUBLT R4, R2, isMinNaN
    69  	MOVD    R9, R3
    70  	AND     R5, R3 // y = |y|
    71  	CMPUBLT R4, R3, isMinNaN
    72  	// ±0 special cases
    73  	OR      R3, R2
    74  	BEQ     isMinZero
    75  
    76  	FMOVD   x+0(FP), F1
    77  	FMOVD   y+8(FP), F2
    78  	FCMPU   F2, F1
    79  	BLT     +3(PC)
    80  	FMOVD   F1, ret+16(FP)
    81  	RET
    82  	FMOVD   F2, ret+16(FP)
    83  	RET
    84  isMinNaN: // return NaN
    85  	MOVD	$NaN, R4
    86  isNegInf: // return -Inf
    87  	MOVD    R4, ret+16(FP)
    88  	RET
    89  isMinZero:
    90  	MOVD    $(1<<63), R4 // -0.0
    91  	CMPUBEQ R4, R8, +3(PC)
    92  	MOVD    R9, ret+16(FP) // return other 0
    93  	RET
    94  	MOVD    R8, ret+16(FP) // return -0
    95  	RET
    96  
    97
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