| commit | d353a688c4eef5107be526e2dc2020b1d267c133 | [log] [tgz] |
|---|---|---|
| author | Sanjay Patel <spatel@rotateright.com> | Sun Dec 16 15:05:48 2018 +0000 |
| committer | Sanjay Patel <spatel@rotateright.com> | Sun Dec 16 15:05:48 2018 +0000 |
| tree | e418b5c658ea5cc4c42dff47f9605b3807415930 | |
| parent | c5f4a842fffd0877598f77c7e6db4ce8c7d717a7 [diff] |
[x86] increment/decrement constant vector with min/max in vsetcc lowering (PR39859) This is part of fixing PR39859: https://bugs.llvm.org/show_bug.cgi?id=39859 We have a crippled vector ISA, so we have to invert a typical fold and create min/max here. As discussed in the bug report, we can probably do better by using saturating subtract when it's available, but we should have this improvement for the min/max patterns regardless. Alive proofs: https://rise4fun.com/Alive/zsf https://rise4fun.com/Alive/Qrl Differential Revision: https://reviews.llvm.org/D55515 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@349304 91177308-0d34-0410-b5e6-96231b3b80d8