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519474451a
This is a subset of https://golang.org/cl/20022 with only the copyright header lines, so the next CL will be smaller and more reviewable. Go policy has been single space after periods in comments for some time. The copyright header template at: https://golang.org/doc/contribute.html#copyright also uses a single space. Make them all consistent. Change-Id: Icc26c6b8495c3820da6b171ca96a74701b4a01b0 Reviewed-on: https://go-review.googlesource.com/20111 Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org> Reviewed-by: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org>
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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