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re PR go/56173 (Several libgo tests FAIL on Solaris/SPARC)

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PR go/56173
crypto/md5: fix for big-endian processors

From-SVN: r195867
This commit is contained in:
Ian Lance Taylor 2013-02-07 21:40:10 +00:00
parent f11c7048b9
commit af4acefcd7
1 changed files with 12 additions and 2 deletions
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14
libgo/go/crypto/md5/md5block.go
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@ -5,6 +5,16 @@ import (
"unsafe"
)
const x86 = runtime.GOARCH == "amd64" || runtime.GOARCH == "386"
var littleEndian bool
func init() {
x := uint32(0x04030201)
y := [4]byte{0x1, 0x2, 0x3, 0x4}
littleEndian = *(*[4]byte)(unsafe.Pointer(&x)) == y
}
func block(dig *digest, p []byte) {
a := dig.s[0]
b := dig.s[1]
@ -16,13 +26,13 @@ func block(dig *digest, p []byte) {
aa, bb, cc, dd := a, b, c, d
// This is a constant condition - it is not evaluated on each iteration.
if runtime.GOARCH == "amd64" || runtime.GOARCH == "386" {
if x86 {
// MD5 was designed so that x86 processors can just iterate
// over the block data directly as uint32s, and we generate
// less code and run 1.3x faster if we take advantage of that.
// My apologies.
X = (*[16]uint32)(unsafe.Pointer(&p[0]))
} else if uintptr(unsafe.Pointer(&p[0]))&(unsafe.Alignof(uint32(0))-1) == 0 {
} else if littleEndian && uintptr(unsafe.Pointer(&p[0]))&(unsafe.Alignof(uint32(0))-1) == 0 {
X = (*[16]uint32)(unsafe.Pointer(&p[0]))
} else {
X = &xbuf