Commit Graph

2 Commits

Author SHA1 Message Date
Roman Lebedev f50023d37c [InstCombine] foldICmpWithLowBitMaskedVal(): handle uncanonical ((-1 << y) >> y) mask
Summary:
The last low-bit-mask-pattern-producing-pattern i can think of.

https://rise4fun.com/Alive/UGzE <- non-canonical
But we can not canonicalize it because of extra uses.

https://bugs.llvm.org/show_bug.cgi?id=38123

Reviewers: spatel, craig.topper, RKSimon

Reviewed By: spatel

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D52148

llvm-svn: 342548
2018-09-19 13:35:46 +00:00
Roman Lebedev 6356864e6d [NFC][InstCombine] One more test pattern for comparisons with low-bit-mask.
https://rise4fun.com/Alive/UGzE <- non-canonical, but has extra uses.

https://bugs.llvm.org/show_bug.cgi?id=38123

llvm-svn: 342345
2018-09-16 12:51:09 +00:00