go/src/math/abs_amd64.s

// 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.

#include "textflag.h"

// func Abs(x float64) float64
TEXT ·Abs(SB),NOSPLIT,$0
	MOVQ   $(1<<63), BX
	MOVQ   BX, X0 // movsd $(-0.0), x0
	MOVSD  x+0(FP), X1
	ANDNPD X1, X0
	MOVSD  X0, ret+8(FP)
	RET
math: amd64 versions of exp and fabs Benchmark of exp to 28 ns/op from 64 ns/op, on 2.53GHz Intel Core 2 Duo. R=rsc CC=golang-dev https://golang.org/cl/1594041 2010-06-30 15:44:27 -06:00			`// 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.`

all: copy cmd/ld/textflag.h into pkg/GOOS_GOARCH The file is used by assembly code to define symbols like NOSPLIT. Having it hidden inside the cmd directory makes it hard to access outside the standard repository. Solution: As with a couple of other files used by cgo, copy the file into the pkg directory and add a -I argument to the assembler to access it. Thus one can write just #include "textflag.h" in .s files. The names in runtime are not updated because in the boot sequence the file has not been copied yet when runtime is built. All other .s files in the repository are updated. Changes to doc/asm.html, src/cmd/dist/build.c, and src/cmd/go/build.go are hand-made. The rest are just the renaming done by a global substitution. (Yay sam). LGTM=rsc R=rsc CC=golang-codereviews https://golang.org/cl/128050043 2014-08-12 18:04:45 -06:00			`#include "textflag.h"`
math: convert textflags from numbers to symbols R=golang-dev, bradfitz CC=golang-dev https://golang.org/cl/12773044 2013-08-12 11:25:18 -06:00
math: remove the leading F from Fabs etc. The letter is a holdover from C and unnecessary in Go. Gofix module included. Fixes #2306. R=golang-dev, gri, dsymonds CC=golang-dev https://golang.org/cl/5158043 2011-09-29 10:54:20 -06:00			`// func Abs(x float64) float64`
math: convert textflags from numbers to symbols R=golang-dev, bradfitz CC=golang-dev https://golang.org/cl/12773044 2013-08-12 11:25:18 -06:00			`TEXT ·Abs(SB),NOSPLIT,$0`
math: amd64 versions of exp and fabs Benchmark of exp to 28 ns/op from 64 ns/op, on 2.53GHz Intel Core 2 Duo. R=rsc CC=golang-dev https://golang.org/cl/1594041 2010-06-30 15:44:27 -06:00			`MOVQ $(1<<63), BX`
			`MOVQ BX, X0 // movsd $(-0.0), x0`
			`MOVSD x+0(FP), X1`
			`ANDNPD X1, X0`
build: update assembly variable names for vet R=golang-dev, r CC=golang-dev https://golang.org/cl/7834046 2013-03-22 10:57:55 -06:00			`MOVSD X0, ret+8(FP)`
math: amd64 versions of exp and fabs Benchmark of exp to 28 ns/op from 64 ns/op, on 2.53GHz Intel Core 2 Duo. R=rsc CC=golang-dev https://golang.org/cl/1594041 2010-06-30 15:44:27 -06:00			`RET`