| commit | 4e29225d159ad62fed5f0b7f8e11843b53e573fd | [log] [tgz] |
|---|---|---|
| author | Sanjay Patel <spatel@rotateright.com> | Fri Aug 04 15:42:47 2017 +0000 |
| committer | Sanjay Patel <spatel@rotateright.com> | Fri Aug 04 15:42:47 2017 +0000 |
| tree | 9711ea2c0341a1326fe69f8f9f48b064c8932c84 | |
| parent | 13725274b0728bc34917dcfa76d2026bb4d5f52d [diff] |
[InstCombine] narrow lshr with constant Name: narrow_shift Pre: C1 < 8 %zx = zext i8 %x to i32 %l = lshr i32 %zx, C1 => %narrowC = trunc i32 C1 to i8 %ns = lshr i8 %x, %narrowC %l = zext i8 %ns to i32 http://rise4fun.com/Alive/jIV This isn't directly applicable to PR34046 as written, but we need to have more narrowing folds like this to be sure that rotate patterns are recognized. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@310060 91177308-0d34-0410-b5e6-96231b3b80d8