| commit | 16150b39473b1a27488cd8b7ec72e7067b6eaadf | [log] [tgz] |
|---|---|---|
| author | Sanjay Patel <spatel@rotateright.com> | Fri Sep 16 22:16:18 2016 +0000 |
| committer | Sanjay Patel <spatel@rotateright.com> | Fri Sep 16 22:16:18 2016 +0000 |
| tree | e43bcbdf9e8fbe6ad05494df9f08c3ff1cd2d97f | |
| parent | 8f824feb124d4cd7827f1924d98a67718fc2db26 [diff] |
[InstCombine] canonicalize vector select with constant vector condition to shuffle As discussed on llvm-dev ( http://lists.llvm.org/pipermail/llvm-dev/2016-August/104210.html ): turn a vector select with constant condition operand into a shuffle as a canonicalization step. Shuffles may be easier to reason about in conjunction with other shuffles and insert/extract. Possible known (minor?) regressions from this change are filed as: https://llvm.org/bugs/show_bug.cgi?id=28530 https://llvm.org/bugs/show_bug.cgi?id=28531 https://llvm.org/bugs/show_bug.cgi?id=30371 If something terrible happens to perf after this commit, feel free to revert until a backend fix is in place. Differential Revision: https://reviews.llvm.org/D24279 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@281787 91177308-0d34-0410-b5e6-96231b3b80d8