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crypto/cipher: xorBytes performance ppc64le/ppc64

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Update supportsUnaligned in xor.go to be true for
GOARCH values ppc64le and ppc64.  This allows the
xor of long buffers to be done on double words
(8 bytes) instead of a single byte at a time, which
significantly improves performance.

Fixes #14350

Change-Id: Iccc6b9d3df2e604a55f4c1e4890bdd3bb0d77ab0
Reviewed-on: https://go-review.googlesource.com/19519
Reviewed-by: Minux Ma <minux@golang.org>
This commit is contained in:
Lynn Boger 2016-02-16 16:05:56 -06:00 committed by Minux Ma
parent eb6ee75add
commit 8b51ee8315
1 changed files with 1 additions and 1 deletions
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2
src/crypto/cipher/xor.go
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@ -10,7 +10,7 @@ import (
)
const wordSize = int(unsafe.Sizeof(uintptr(0)))
const supportsUnaligned = runtime.GOARCH == "386" || runtime.GOARCH == "amd64"
const supportsUnaligned = runtime.GOARCH == "386" || runtime.GOARCH == "amd64" || runtime.GOARCH == "ppc64" || runtime.GOARCH == "ppc64le"
// fastXORBytes xors in bulk. It only works on architectures that
// support unaligned read/writes.