crypto/cipher: xorBytes performance ppc64le/ppc64

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>

diff --git a/src/crypto/cipher/xor.go b/src/crypto/cipher/xor.go
index f88dc8914ac8c98fa8691947ee4721326930e292..020c9e1730e9bb8cc5767d3eafafa8143c8b76eb 100644 (file)
--- a/src/crypto/cipher/xor.go
+++ b/src/crypto/cipher/xor.go
@@ -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.