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runtime: use unaligned loads on ppc64

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benchmark                      old ns/op     new ns/op     delta
BenchmarkAlignedLoad-160       8.67          7.42          -14.42%
BenchmarkUnalignedLoad-160     8.63          7.37          -14.60%

Change-Id: Id4609d7b4038c4d2ec332efc4fe6f1adfb61b82b
Reviewed-on: https://go-review.googlesource.com/20812
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Keith Randall 2016-03-17 13:28:04 -07:00
parent 982322769c
commit 15ea61146e
4 changed files with 27 additions and 2 deletions
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3
src/runtime/export_test.go
View File

@ -193,3 +193,6 @@ func SetTracebackEnv(level string) {
setTraceback(level)
traceback_env = traceback_cache
}
var ReadUnaligned32 = readUnaligned32
var ReadUnaligned64 = readUnaligned64

22
src/runtime/hash_test.go
View File

@ -11,6 +11,7 @@ import (
. "runtime"
"strings"
"testing"
"unsafe"
)
// Smhasher is a torture test for hash functions.
@ -658,3 +659,24 @@ func TestStructHash(t *testing.T) {
t.Errorf("too many allocs %f - hash not balanced", n)
}
}
var sink uint64
func BenchmarkAlignedLoad(b *testing.B) {
var buf [16]byte
p := unsafe.Pointer(&buf[0])
var s uint64
for i := 0; i < b.N; i++ {
s += ReadUnaligned64(p)
}
sink = s
}
func BenchmarkUnalignedLoad(b *testing.B) {
var buf [16]byte
p := unsafe.Pointer(&buf[1])
var s uint64
for i := 0; i < b.N; i++ {
s += ReadUnaligned64(p)
}
sink = s
}

2
src/runtime/unaligned1.go
View File

@ -2,7 +2,7 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build 386 amd64 amd64p32 arm64
// +build 386 amd64 amd64p32 arm64 ppc64 ppc64le
package runtime

2
src/runtime/unaligned2.go
View File

@ -2,7 +2,7 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build arm ppc64 ppc64le mips64 mips64le
// +build arm mips64 mips64le
package runtime