[all-commits] [llvm/llvm-project] d3f1f7: [EarlyCSE] Use m_LogicalAnd/Or matchers to handle ...
Juneyoung Lee via All-commits
all-commits at lists.llvm.org
Sun Dec 27 12:41:16 PST 2020
Branch: refs/heads/master
Home: https://github.com/llvm/llvm-project
Commit: d3f1f7b6bca585b76d40422e8076d59113e3bb80
https://github.com/llvm/llvm-project/commit/d3f1f7b6bca585b76d40422e8076d59113e3bb80
Author: Juneyoung Lee <aqjune at gmail.com>
Date: 2020-12-28 (Mon, 28 Dec 2020)
Changed paths:
M llvm/lib/Transforms/Scalar/EarlyCSE.cpp
M llvm/test/Transforms/EarlyCSE/and_or.ll
Log Message:
-----------
[EarlyCSE] Use m_LogicalAnd/Or matchers to handle branch conditions
EarlyCSE's handleBranchCondition says:
```
// If the condition is AND operation, we can propagate its operands into the
// true branch. If it is OR operation, we can propagate them into the false
// branch.
```
This holds for the corresponding select patterns as well.
This is a part of an ongoing work for disabling buggy select->and/or transformations.
See llvm.org/pr48353 and D93065 for more context
Proof:
and: https://alive2.llvm.org/ce/z/MQWodU
or: https://alive2.llvm.org/ce/z/9GLbB_
Reviewed By: nikic
Differential Revision: https://reviews.llvm.org/D93842
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