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cmd/compile: ignore dead phis in fuse

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Happens occasionally for boolean phis was used as a control.

Change-Id: Ie0f2483e9004c1706751d8dfb25ee2e5106d917e
Reviewed-on: https://go-review.googlesource.com/21310
Run-TryBot: Alexandru Moșoi <alexandru@mosoi.ro>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
This commit is contained in:
Alexandru Moșoi 2016-03-30 16:19:10 +02:00 committed by Alexandru Moșoi
parent 152a08c531
commit d7f7ea6ea8
1 changed files with 1 additions and 1 deletions
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2
src/cmd/compile/internal/ssa/fuse.go
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@ -65,7 +65,7 @@ func fuseBlockIf(b *Block) bool {
b.Fatalf("invalid predecessors")
}
for _, v := range ss.Values {
if v.Op == OpPhi && v.Args[i0] != v.Args[i1] {
if v.Op == OpPhi && v.Uses > 0 && v.Args[i0] != v.Args[i1] {
return false
}
}