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2 Commits

Author SHA1 Message Date
Roman Lebedev 136867931a [InstCombine] Canonicalize variable mask in masked merge 
Summary:
Masked merge has a pattern of: `((x ^ y) & M) ^ y`.
But, there is no difference between `((x ^ y) & M) ^ y` and `((x ^ y) & ~M) ^ x`,
We should canonicalize the pattern to non-inverted mask.

https://rise4fun.com/Alive/Yol

Reviewers: spatel, craig.topper

Reviewed By: spatel

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D45664

llvm-svn: 331112
 2018-04-28 15:45:07 +00:00
Roman Lebedev 6b1e66b188 [InstCombine][NFC] Add tests for variable mask canonicalization in masked merge 
Summary:
Masked merge has a pattern of: `((x ^ y) & M) ^ y`.
But, there is no difference between `((x ^ y) & M) ^ y` and `((x ^ y) & ~M) ^ x`,
We should canonicalize the pattern to non-inverted mask.

Differential Revision: https://reviews.llvm.org/D45663

llvm-svn: 331111
 2018-04-28 15:45:00 +00:00