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https://github.com/golang/go
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c007ce824d
Preparation was in CL 134570043. This CL contains only the effect of 'hg mv src/pkg/* src'. For more about the move, see golang.org/s/go14nopkg.
53 lines
1.0 KiB
ArmAsm
53 lines
1.0 KiB
ArmAsm
// Copyright 2010 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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#include "textflag.h"
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#define PosInf 0x7FF0000000000000
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#define NaN 0x7FF8000000000001
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// func Hypot(p, q float64) float64
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TEXT ·Hypot(SB),NOSPLIT,$0
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// test bits for special cases
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MOVQ p+0(FP), BX
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MOVQ $~(1<<63), AX
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ANDQ AX, BX // p = |p|
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MOVQ q+8(FP), CX
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ANDQ AX, CX // q = |q|
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MOVQ $PosInf, AX
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CMPQ AX, BX
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JLE isInfOrNaN
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CMPQ AX, CX
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JLE isInfOrNaN
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// hypot = max * sqrt(1 + (min/max)**2)
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MOVQ BX, X0
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MOVQ CX, X1
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ORQ CX, BX
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JEQ isZero
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MOVAPD X0, X2
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MAXSD X1, X0
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MINSD X2, X1
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DIVSD X0, X1
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MULSD X1, X1
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ADDSD $1.0, X1
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SQRTSD X1, X1
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MULSD X1, X0
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MOVSD X0, ret+16(FP)
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RET
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isInfOrNaN:
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CMPQ AX, BX
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JEQ isInf
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CMPQ AX, CX
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JEQ isInf
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MOVQ $NaN, AX
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MOVQ AX, ret+16(FP) // return NaN
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RET
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isInf:
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MOVQ AX, ret+16(FP) // return +Inf
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RET
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isZero:
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MOVQ $0, AX
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MOVQ AX, ret+16(FP) // return 0
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RET
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