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runtime: short-circuit typedmemmove when dst==src

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Change-Id: I855268a4c0d07ad602ec90f5da66422d3d87c5f2
Reviewed-on: https://go-review.googlesource.com/94595
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Keith Randall <khr@golang.org>
This commit is contained in:
Josh Bleecher Snyder 2017-11-12 21:36:20 -08:00
parent 68def82008
commit 486caa26d7
1 changed files with 3 additions and 0 deletions
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3
src/runtime/mbarrier.go
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@ -154,6 +154,9 @@ import (
// //
//go:nosplit //go:nosplit
func typedmemmove(typ *_type, dst, src unsafe.Pointer) { func typedmemmove(typ *_type, dst, src unsafe.Pointer) {
if dst == src {
return
}
if typ.kind&kindNoPointers == 0 { if typ.kind&kindNoPointers == 0 {
bulkBarrierPreWrite(uintptr(dst), uintptr(src), typ.size) bulkBarrierPreWrite(uintptr(dst), uintptr(src), typ.size)
} }