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cmd/compile: add ZeroWB case in writebarrier

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It looks like it should be there, although I couldn't find a test
case that fails without it. ZeroWB is probably never generated now:
zeroing an initialized heap object is done by making an autotmp on
stack, zeroing it, and copying (typedmemmove) to heap.

Passes "toolstash -cmp" on std.

Change-Id: I702a59759e33fb8cc2a34a3b3029e7540aca080a
Reviewed-on: https://go-review.googlesource.com/35250
Reviewed-by: Austin Clements <austin@google.com>
Run-TryBot: Austin Clements <austin@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Cherry Zhang 2017-01-13 15:42:50 -05:00
parent 787125abab
commit 92ecd78933
1 changed files with 1 additions and 1 deletions
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2
src/cmd/compile/internal/ssa/writebarrier.go
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@ -35,7 +35,7 @@ func writebarrier(f *Func) {
valueLoop:
for i, v := range b.Values {
switch v.Op {
case OpStoreWB, OpMoveWB, OpMoveWBVolatile:
case OpStoreWB, OpMoveWB, OpMoveWBVolatile, OpZeroWB:
if IsStackAddr(v.Args[0]) {
switch v.Op {
case OpStoreWB: