Josh Bleecher Snyder 5272a2cdc5 cmd/compile: avoid infinite loops in dead blocks during phi insertion ... Now that we no longer generate dead code, it is possible to follow block predecessors into infinite loops with no variable definitions, causing an infinite loop during phi insertion. To fix that, check explicitly whether the predecessor is dead in lookupVarOutgoing, and if so, bail. The loop in lookupVarOutgoing is very hot code, so I am wary of adding anything to it. However, a long, CPU-only benchmarking run shows no performance impact at all. Fixes #19783 Change-Id: I8ef8d267e0b20a29b5cb0fecd7084f76c6f98e47 Reviewed-on: https://go-review.googlesource.com/38913 Reviewed-by: David Chase <drchase@google.com>		2017-03-30 17:06:08 +00:00
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alias3.dir
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fixedbugs	cmd/compile: avoid infinite loops in dead blocks during phi insertion	2017-03-30 17:06:08 +00:00
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