diff options
| author | Charles L. Dorian <cldorian@gmail.com> | 2010-05-18 22:33:50 -0700 |
|---|---|---|
| committer | Charles L. Dorian <cldorian@gmail.com> | 2010-05-18 22:33:50 -0700 |
| commit | cedb54490a281d2fce83ef36f8b00bf8e08b8a53 (patch) | |
| tree | b2a8f1e374097b480bb08ddf06222cfb0ba06ba0 | |
| parent | 4518bb741791a5d7dc251e47abc1b89152e19261 (diff) | |
| download | golang-cedb54490a281d2fce83ef36f8b00bf8e08b8a53.tar.gz | |
math: amd64 versions of fdim, fmax, fmin
Uses the SSE2 max, min instructions. Also shorter sqrt_amd64.s
R=rsc
CC=golang-dev
http://codereview.appspot.com/1216042
Committer: Russ Cox <rsc@golang.org>
| -rw-r--r-- | src/pkg/math/Makefile | 1 | ||||
| -rw-r--r-- | src/pkg/math/fdim_amd64.s | 26 | ||||
| -rw-r--r-- | src/pkg/math/fdim_decl.go | 9 | ||||
| -rw-r--r-- | src/pkg/math/sqrt_amd64.s | 3 |
4 files changed, 37 insertions, 2 deletions
diff --git a/src/pkg/math/Makefile b/src/pkg/math/Makefile index e8edd3505..1447fc11d 100644 --- a/src/pkg/math/Makefile +++ b/src/pkg/math/Makefile @@ -7,6 +7,7 @@ include ../../Make.$(GOARCH) TARG=math OFILES_amd64=\ + fdim_amd64.$O\ sqrt_amd64.$O\ OFILES_386=\ diff --git a/src/pkg/math/fdim_amd64.s b/src/pkg/math/fdim_amd64.s new file mode 100644 index 000000000..1f45ef8b9 --- /dev/null +++ b/src/pkg/math/fdim_amd64.s @@ -0,0 +1,26 @@ +// Copyright 2010 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +// func Fdim(x, y float64) float64 +TEXT ·Fdim(SB),7,$0 + MOVSD x+0(FP), X0 + SUBSD y+8(FP), X0 + MOVSD $(0.0), X1 + MAXSD X1, X0 + MOVSD X0, r+16(FP) + RET + +// func Fmax(x, y float64) float64 +TEXT ·Fmax(SB),7,$0 + MOVSD x+0(FP), X0 + MAXSD y+8(FP), X0 + MOVSD X0, r+16(FP) + RET + +// func Fmin(x, y float64) float64 +TEXT ·Fmin(SB),7,$0 + MOVSD x+0(FP), X0 + MINSD y+8(FP), X0 + MOVSD X0, r+16(FP) + RET diff --git a/src/pkg/math/fdim_decl.go b/src/pkg/math/fdim_decl.go new file mode 100644 index 000000000..88dea3de4 --- /dev/null +++ b/src/pkg/math/fdim_decl.go @@ -0,0 +1,9 @@ +// Copyright 2010 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package math + +func Fdim(x, y float64) float64 +func Fmax(x, y float64) float64 +func Fmin(x, y float64) float64 diff --git a/src/pkg/math/sqrt_amd64.s b/src/pkg/math/sqrt_amd64.s index e98daebf9..f5b329e70 100644 --- a/src/pkg/math/sqrt_amd64.s +++ b/src/pkg/math/sqrt_amd64.s @@ -4,7 +4,6 @@ // func Sqrt(x float64) float64 TEXT ·Sqrt(SB),7,$0 - MOVSD x+0(FP), X0 - SQRTSD X0, X0 + SQRTSD x+0(FP), X0 MOVSD X0, r+8(FP) RET |