| commit | ab07556fab4baef2e0d96fa190a8a99dac926073 | [log] [tgz] |
|---|---|---|
| author | Huihui Zhang <huihuiz@quicinc.com> | Tue Jun 25 20:44:52 2019 +0000 |
| committer | Huihui Zhang <huihuiz@quicinc.com> | Tue Jun 25 20:44:52 2019 +0000 |
| tree | a0dd6a90804716631c5a07d840c8ab3a6eae0106 | |
| parent | 8e5ac908e973d5c1a0424793b4bc6e52cdbb85f0 [diff] |
[InstCombine] Simplify icmp ult/uge (shl %x, C2), C1 iff C1 is power of two -> icmp eq/ne (and %x, (lshr -C1, C2)), 0. Simplify 'shl' inequality test into 'and' equality test. This pattern happens in the middle-end while simplifying bitfield access, Exposed in https://reviews.llvm.org/D63505 https://rise4fun.com/Alive/6uz Reviewers: lebedev.ri, efriedma Reviewed By: lebedev.ri Subscribers: spatel, hiraditya, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D63675 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@364348 91177308-0d34-0410-b5e6-96231b3b80d8