go/src/math/exp_386.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 Exp(x float64) float64
TEXT ·Exp(SB),NOSPLIT,$0
	// Used to use 387 assembly (FLDL2E+F2XM1) here,
	// but it was both slower and less accurate than the portable Go code.
	JMP ·exp(SB)
all: make copyright headers consistent with one space after period 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> 2016-03-01 15:57:46 -07:00			`// Copyright 2010 The Go Authors. All rights reserved.`
math: 386 FPU functions sin, cos, tan, asin, acos, atan, exp, log, log10, floor, ceil, and fabs R=rsc CC=golang-dev https://golang.org/cl/189083 2010-01-15 14:21:36 -07:00			`// 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: 386 FPU functions sin, cos, tan, asin, acos, atan, exp, log, log10, floor, ceil, and fabs R=rsc CC=golang-dev https://golang.org/cl/189083 2010-01-15 14:21:36 -07:00			`// func Exp(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 ·Exp(SB),NOSPLIT,$0`
math: use portable Exp instead of 387 instructions on 386 The 387 implementation is less accurate and slower. name old time/op new time/op delta Exp-8 29.7ns ± 2% 24.0ns ± 2% -19.08% (p=0.000 n=10+10) This makes Gamma more accurate too. Change-Id: Iad33b9cce0b087ccbce3e08ba7a6d285c4999d02 Reviewed-on: https://go-review.googlesource.com/30230 Run-TryBot: Russ Cox <rsc@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Quentin Smith <quentin@golang.org> Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org> 2016-10-03 20:33:49 -06:00			`// Used to use 387 assembly (FLDL2E+F2XM1) here,`
			`// but it was both slower and less accurate than the portable Go code.`
			`JMP ·exp(SB)`