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math: implement asm modf for ppc64x 

This change adds an asm implementations modf for ppc64x.

Improvements:

BenchmarkModf-16               7.48          6.26          -16.31%

Updates: #21390

Change-Id: I9c4f3213688e3e8842d050840dc04fc9c0bf6ce4
Reviewed-on: https://go-review.googlesource.com/74411
Run-TryBot: Lynn Boger <laboger@linux.vnet.ibm.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Michael Munday <mike.munday@ibm.com>
This commit is contained in:
Lynn Boger 2017-10-30 10:36:15 -04:00
parent 0d101d1a9f
commit 3860478b42
2 changed files with 17 additions and 3 deletions
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17
src/math/modf_ppc64x.s Normal file
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@ -0,0 +1,17 @@
// Copyright 2017 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.
// +build ppc64 ppc64le
#include "textflag.h"
// func Modf(f float64) (int float64, frac float64)
TEXT ·Modf(SB),NOSPLIT,$0
FMOVD f+0(FP), F0
FRIZ F0, F1
FMOVD F1, int+8(FP)
FSUB F1, F0, F2
FCPSGN F2, F0, F2
FMOVD F2, frac+16(FP)
RET

3
src/math/stubs_ppc64x.s
View File

@ -72,9 +72,6 @@ TEXT ·Log1p(SB),NOSPLIT,$0
TEXT ·Log(SB),NOSPLIT,$0
BR ·log(SB)
TEXT ·Modf(SB),NOSPLIT,$0
BR ·modf(SB)
TEXT ·Mod(SB),NOSPLIT,$0
BR ·mod(SB)