f8093b8f24
Add a check to make sure value arguments dominate the value. Phi elim output used to fail this test. When eliminating redundant phis, phi elim was using one of the args and not the ultimate source. For example: b1: x = ... -> b2 b3 b2: y = Copy x b3: z = Copy x -> b4 -> b4 b4: w = phi y z Phi elim eliminates w, but it used to replace w with (Copy y). That's bad as b2 does not dominate b4. Instead we should replace w with (Copy x). Fixes #12347 Change-Id: I9f340cdabcda8e2e90359fb4f9250877b1fffe98 Reviewed-on: https://go-review.googlesource.com/13986 Reviewed-by: David Chase <drchase@google.com> |
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