Commit Graph

2 Commits

Author SHA1 Message Date
Davide Italiano c78885818a [InstCombine] Fold branches with irrelevant conditions to a constant.
InstCombine folds instructions with irrelevant conditions to undef.
This, as Nuno confirmed is a bug.
(see https://bugs.llvm.org/show_bug.cgi?id=33409#c1 )

Given the original motivation for the change is that of removing an
USE, we now fold to false instead (which reaches the same goal
without undesired side effects).

Fixes PR33409.

Differential Revision:  https://reviews.llvm.org/D36975

llvm-svn: 311540
2017-08-23 09:14:37 +00:00
Davide Italiano 579064e2c1 [InstCombine] Don't violate dominance when replacing instructions.
Differential Revision:  https://reviews.llvm.org/D35376

llvm-svn: 308144
2017-07-16 18:56:30 +00:00