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| author | Keith Randall <khr@golang.org> | 2016-03-29 21:25:33 -0700 |
|---|---|---|
| committer | Keith Randall <khr@golang.org> | 2016-03-31 02:54:10 +0000 |
| commit | 4b209dbf0bf3e5fd4cffda1e11f11bf45ddf212d (patch) | |
| tree | a7af96647c02144a3e82b576eb72d1704bf2f6ff /src/runtime/runtime2.go | |
| parent | 1a9373bc570cf408cecdfab5d531e8041f354a54 (diff) | |
| download | go-4b209dbf0bf3e5fd4cffda1e11f11bf45ddf212d.tar.xz | |
runtime: don't use REP;MOVSB if CPUID doesn't say it is fast
Only use REP;MOVSB if:
1) The CPUID flag says it is fast, and
2) The pointers are unaligned
Otherwise, use REP;MOVSQ.
Update #14630
Change-Id: I946b28b87880c08e5eed1ce2945016466c89db66
Reviewed-on: https://go-review.googlesource.com/21300
Reviewed-by: Nigel Tao <nigeltao@golang.org>
Diffstat (limited to 'src/runtime/runtime2.go')
| -rw-r--r-- | src/runtime/runtime2.go | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/src/runtime/runtime2.go b/src/runtime/runtime2.go index e1b1c83453..457927c804 100644 --- a/src/runtime/runtime2.go +++ b/src/runtime/runtime2.go @@ -701,6 +701,7 @@ var ( // Set on startup in asm_{x86,amd64}.s. cpuid_ecx uint32 cpuid_edx uint32 + cpuid_ebx7 uint32 lfenceBeforeRdtsc bool support_avx bool support_avx2 bool |