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| author | Nikita Popov <nikita.ppv@gmail.com> | 2019-12-07 12:21:22 +0100 |
|---|---|---|
| committer | Nikita Popov <nikita.ppv@gmail.com> | 2019-12-31 16:17:14 +0100 |
| commit | 27a0795943fee0f30b995fe5165428afc2dfd402 (patch) | |
| tree | 078a02a51d3766d64e07039d5cb174ffaa313b04 /llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp | |
| parent | f5b7dd3c9ec041480d28d203f22929f0f0809d6e (diff) | |
| download | llvm-27a0795943fee0f30b995fe5165428afc2dfd402.zip llvm-27a0795943fee0f30b995fe5165428afc2dfd402.tar.gz llvm-27a0795943fee0f30b995fe5165428afc2dfd402.tar.bz2 | |
[InstCombine] Fix infinite loop due to bitcast <-> phi transforms
Fix for https://bugs.llvm.org/show_bug.cgi?id=44245.
The optimizeBitCastFromPhi() and FoldPHIArgOpIntoPHI() end up
fighting against each other, because optimizeBitCastFromPhi()
assumes that bitcasts of loads will get folded. This doesn't happen
here, because a dangling phi node prevents the one-use fold in
https://github.com/llvm/llvm-project/blob/master/llvm/lib/Transforms/InstCombine/InstCombineLoadStoreAlloca.cpp#L620-L628 from triggering.
This patch fixes the issue by adding manually removing the old phis.
Differential Revision: https://reviews.llvm.org/D71164
Diffstat (limited to 'llvm/lib/CodeGen/TargetLoweringObjectFileImpl.cpp')
0 files changed, 0 insertions, 0 deletions