diff options
Diffstat (limited to 'libgo/go/crypto/md5/gen.go')
| -rw-r--r-- | libgo/go/crypto/md5/gen.go | 19 |
1 files changed, 17 insertions, 2 deletions
diff --git a/libgo/go/crypto/md5/gen.go b/libgo/go/crypto/md5/gen.go index 966bdae..275b4ae 100644 --- a/libgo/go/crypto/md5/gen.go +++ b/libgo/go/crypto/md5/gen.go @@ -161,6 +161,11 @@ var data = Data{ } var program = ` +// DO NOT EDIT. +// Generate with: go run gen.go{{if .Full}} -full{{end}} | gofmt >md5block.go + +// +build !amd64 + package md5 import ( @@ -186,6 +191,16 @@ import ( } {{end}} +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] @@ -197,13 +212,13 @@ 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 |