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| author | Keith Randall <khr@golang.org> | 2014-02-06 17:43:22 -0800 |
|---|---|---|
| committer | Keith Randall <khr@golang.org> | 2014-02-06 17:43:22 -0800 |
| commit | da7cf0ba5d5aed78f07c82508f0fa88e6dd69ea7 (patch) | |
| tree | 53946fc6bf0ab051d12b2804bc2d4dcb48fb401d /src/pkg/runtime/alg.c | |
| parent | aac872e11806b7a66ab51f5efab7496a36e4f3da (diff) | |
| download | go-da7cf0ba5d5aed78f07c82508f0fa88e6dd69ea7.tar.xz | |
runtime: faster memclr on x86.
Use explicit SSE writes instead of REP STOSQ.
benchmark old ns/op new ns/op delta
BenchmarkMemclr5 22 5 -73.62%
BenchmarkMemclr16 27 5 -78.49%
BenchmarkMemclr64 28 6 -76.43%
BenchmarkMemclr256 34 8 -74.94%
BenchmarkMemclr4096 112 84 -24.73%
BenchmarkMemclr65536 1902 1920 +0.95%
LGTM=dvyukov
R=golang-codereviews, dvyukov
CC=golang-codereviews
https://golang.org/cl/60090044
Diffstat (limited to 'src/pkg/runtime/alg.c')
| -rw-r--r-- | src/pkg/runtime/alg.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/src/pkg/runtime/alg.c b/src/pkg/runtime/alg.c index c3a8396955..623858f7c1 100644 --- a/src/pkg/runtime/alg.c +++ b/src/pkg/runtime/alg.c @@ -514,6 +514,11 @@ runtime·equal(Type *t, ...) t->alg->equal((bool*)ret, t->size, x, y); } +// Testing adapter for memclr +void runtime·memclrBytes(Slice s) { + runtime·memclr(s.array, s.len); +} + // Testing adapters for hash quality tests (see hash_test.go) void runtime·haveGoodHash(bool res) { res = use_aeshash; |