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[dev.ssa] cmd/compile/internal/ssa: Phi inputs from dead blocks are not live

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Fixes #11676

Change-Id: I941f951633c89bb1454ce6d1d1b4124d46a7d9dd
Reviewed-on: https://go-review.googlesource.com/12091
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Keith Randall 2015-07-11 14:41:22 -07:00
parent 7a982e3c49
commit 050ce4390a
1 changed files with 4 additions and 1 deletions
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5
src/cmd/compile/internal/ssa/deadcode.go
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@ -44,7 +44,10 @@ func deadcode(f *Func) {
// pop a reachable value
v := q[len(q)-1]
q = q[:len(q)-1]
for _, x := range v.Args {
for i, x := range v.Args {
if v.Op == OpPhi && !reachable[v.Block.Preds[i].ID] {
continue
}
if !live[x.ID] {
live[x.ID] = true
q = append(q, x) // push