mirror of
https://github.com/golang/go
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133 lines
2.7 KiB
ArmAsm
133 lines
2.7 KiB
ArmAsm
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// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Based on dim_amd64.s
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#include "textflag.h"
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#define PosInf 0x7FF0000000000000
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#define NaN 0x7FF8000000000001
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#define NegInf 0xFFF0000000000000
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// func Dim(x, y float64) float64
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TEXT ·Dim(SB),NOSPLIT,$0
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// (+Inf, +Inf) special case
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MOVD x+0(FP), R2
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MOVD y+8(FP), R3
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MOVD $PosInf, R4
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CMPUBNE R4, R2, dim2
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CMPUBEQ R4, R3, bothInf
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dim2: // (-Inf, -Inf) special case
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MOVD $NegInf, R4
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CMPUBNE R4, R2, dim3
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CMPUBEQ R4, R3, bothInf
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dim3: // (NaN, x) or (x, NaN)
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MOVD $~(1<<63), R5
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MOVD $PosInf, R4
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AND R5, R2 // x = |x|
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CMPUBLT R4, R2, isDimNaN
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AND R5, R3 // y = |y|
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CMPUBLT R4, R3, isDimNaN
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FMOVD x+0(FP), F1
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FMOVD y+8(FP), F2
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FSUB F2, F1
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FMOVD $(0.0), F2
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FCMPU F2, F1
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BGE +3(PC)
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FMOVD F1, ret+16(FP)
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RET
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FMOVD F2, ret+16(FP)
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RET
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bothInf: // Dim(-Inf, -Inf) or Dim(+Inf, +Inf)
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isDimNaN:
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MOVD $NaN, R4
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MOVD R4, ret+16(FP)
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RET
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// func ·Max(x, y float64) float64
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TEXT ·Max(SB),NOSPLIT,$0
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// +Inf special cases
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MOVD $PosInf, R4
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MOVD x+0(FP), R8
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CMPUBEQ R4, R8, isPosInf
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MOVD y+8(FP), R9
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CMPUBEQ R4, R9, isPosInf
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// NaN special cases
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MOVD $~(1<<63), R5 // bit mask
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MOVD $PosInf, R4
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MOVD R8, R2
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AND R5, R2 // x = |x|
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CMPUBLT R4, R2, isMaxNaN
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MOVD R9, R3
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AND R5, R3 // y = |y|
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CMPUBLT R4, R3, isMaxNaN
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// ±0 special cases
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OR R3, R2
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BEQ isMaxZero
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FMOVD x+0(FP), F1
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FMOVD y+8(FP), F2
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FCMPU F2, F1
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BGT +3(PC)
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FMOVD F1, ret+16(FP)
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RET
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FMOVD F2, ret+16(FP)
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RET
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isMaxNaN: // return NaN
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MOVD $NaN, R4
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isPosInf: // return +Inf
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MOVD R4, ret+16(FP)
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RET
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isMaxZero:
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MOVD $(1<<63), R4 // -0.0
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CMPUBEQ R4, R8, +3(PC)
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MOVD R8, ret+16(FP) // return 0
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RET
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MOVD R9, ret+16(FP) // return other 0
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RET
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// func Min(x, y float64) float64
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TEXT ·Min(SB),NOSPLIT,$0
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// -Inf special cases
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MOVD $NegInf, R4
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MOVD x+0(FP), R8
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CMPUBEQ R4, R8, isNegInf
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MOVD y+8(FP), R9
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CMPUBEQ R4, R9, isNegInf
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// NaN special cases
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MOVD $~(1<<63), R5
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MOVD $PosInf, R4
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MOVD R8, R2
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AND R5, R2 // x = |x|
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CMPUBLT R4, R2, isMinNaN
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MOVD R9, R3
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AND R5, R3 // y = |y|
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CMPUBLT R4, R3, isMinNaN
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// ±0 special cases
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OR R3, R2
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BEQ isMinZero
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FMOVD x+0(FP), F1
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FMOVD y+8(FP), F2
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FCMPU F2, F1
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BLT +3(PC)
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FMOVD F1, ret+16(FP)
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RET
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FMOVD F2, ret+16(FP)
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RET
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isMinNaN: // return NaN
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MOVD $NaN, R4
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isNegInf: // return -Inf
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MOVD R4, ret+16(FP)
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RET
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isMinZero:
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MOVD $(1<<63), R4 // -0.0
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CMPUBEQ R4, R8, +3(PC)
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MOVD R9, ret+16(FP) // return other 0
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RET
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MOVD R8, ret+16(FP) // return -0
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RET
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