mirror of
https://github.com/golang/go
synced 2024-10-04 11:11:21 -06:00
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>
28 lines
860 B
ArmAsm
28 lines
860 B
ArmAsm
// 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 Log1p(x float64) float64
|
|
TEXT ·Log1p(SB),NOSPLIT,$0
|
|
FMOVD $(2.928932188134524e-01), F0
|
|
FMOVD x+0(FP), F0 // F0=x, F1=1-sqrt(2)/2 = 0.29289321881345247559915564
|
|
FABS // F0=|x|, F1=1-sqrt(2)/2
|
|
FUCOMPP F0, F1 // compare F0 to F1
|
|
FSTSW AX
|
|
FLDLN2 // F0=log(2)
|
|
ANDW $0x0100, AX
|
|
JEQ use_fyl2x // jump if F0 >= F1
|
|
FMOVD x+0(FP), F0 // F0=x, F1=log(2)
|
|
FYL2XP1 // F0=log(1+x)=log2(1+x)*log(2)
|
|
FMOVDP F0, ret+8(FP)
|
|
RET
|
|
use_fyl2x:
|
|
FLD1 // F0=1, F2=log(2)
|
|
FADDD x+0(FP), F0 // F0=1+x, F1=log(2)
|
|
FYL2X // F0=log(1+x)=log2(1+x)*log(2)
|
|
FMOVDP F0, ret+8(FP)
|
|
RET
|
|
|