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[dev.ssa] cmd/compile: handle OpCopy loops in rewrite

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Change-Id: Icbaad6e5cbfc5430a651538fe90c0a9ee664faf4
Reviewed-on: https://go-review.googlesource.com/12360
Reviewed-by: Keith Randall <khr@golang.org>
This commit is contained in:
Josh Bleecher Snyder 2015-07-17 10:45:48 -06:00
parent c1593da817
commit f421735bb4
1 changed files with 4 additions and 1 deletions
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5
src/cmd/compile/internal/ssa/rewrite.go
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@ -42,7 +42,10 @@ func applyRewrite(f *Func, rb func(*Block) bool, rv func(*Value, *Config) bool)
if a.Op != OpCopy {
continue
}
for a.Op == OpCopy {
// Rewriting can generate OpCopy loops.
// They are harmless (see removePredecessor),
// but take care not to loop forever.
for a.Op == OpCopy && a != a.Args[0] {
a = a.Args[0]
}
v.Args[i] = a