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[dev.ssa] cmd/compile/internal/ssa: don't treat vardef/varkill as reads

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This makes deadstore elimination work reasonably again.

Change-Id: I3a8caced71f12dfb6c1d0c68b7a7d8d7a736ea23
Reviewed-on: https://go-review.googlesource.com/14536
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Keith Randall 2015-09-12 14:45:58 -07:00
parent 46ffb026b4
commit fda72e0375
1 changed files with 1 additions and 1 deletions
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2
src/cmd/compile/internal/ssa/deadstore.go
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@ -30,7 +30,7 @@ func dse(f *Func) {
for _, a := range v.Args {
if a.Block == b && a.Type.IsMemory() {
storeUse.add(a.ID)
if v.Op != OpStore && v.Op != OpZero {
if v.Op != OpStore && v.Op != OpZero && v.Op != OpVarDef && v.Op != OpVarKill {
// CALL, DUFFCOPY, etc. are both
// reads and writes.
loadUse.add(a.ID)