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runtime/bytes: fast Compare for byte arrays and strings.

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Uses SSE instructions to process 16 bytes at a time.

fixes #5354

R=bradfitz, google
CC=golang-dev
https://golang.org/cl/8853048
This commit is contained in:
Keith Randall 2013-05-14 16:05:51 -07:00
parent f1583bb956
commit b3946dc119
9 changed files with 568 additions and 64 deletions
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10
src/pkg/bytes/bytes_test.go
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@ -47,7 +47,7 @@ type BinOpTest struct {
i int
}
var compareTests = []struct {
var equalTests = []struct {
a, b []byte
i int
}{
@ -73,12 +73,8 @@ var compareTests = []struct {
{nil, []byte("a"), -1},
}
func TestCompare(t *testing.T) {
func TestEqual(t *testing.T) {
for _, tt := range compareTests {
cmp := Compare(tt.a, tt.b)
if cmp != tt.i {
t.Errorf(`Compare(%q, %q) = %v`, tt.a, tt.b, cmp)
}
eql := Equal(tt.a, tt.b)
if eql != (tt.i == 0) {
t.Errorf(`Equal(%q, %q) = %v`, tt.a, tt.b, eql)
@ -90,7 +86,7 @@ func TestCompare(t *testing.T) {
}
}
func TestEqual(t *testing.T) {
func TestEqualExhaustive(t *testing.T) {
var size = 128
if testing.Short() {
size = 32