| commit | b193fb3f223716f6334a73132a1c82ded24bfbc7 | |
| author | Simon Pilgrim <lvm-dev@redking.me.uk> | |
| Fri, 5 Apr 2019 14:56:21 +0000 (5 14:56 +0000) | ||
| committer | Simon Pilgrim <lvm-dev@redking.me.uk> | |
| Fri, 5 Apr 2019 14:56:21 +0000 (5 14:56 +0000) | ||
| tree | 24cf512acd1bbb2e4ebf5b500184e0b18ec86d90 | treesnapshot (tar.gz zip) |
| parent | 6bc7028ec62154f00a32bae587bd19a07dc1f53e | commitdiff |
[SelectionDAG] Add fcmp UNDEF handling to SelectionDAG::FoldSetCC
Second half of PR40800, this patch adds DAG undef handling to fcmp instructions to match the behavior in llvm::ConstantFoldCompareInstruction, this permits constant folding of vector comparisons where some elements had been reduced to UNDEF (by SimplifyDemandedVectorElts etc.).
This involves a lot of tweaking to reduced tests as bugpoint loves to reduce fcmp arguments to undef........
Differential Revision: https://reviews.llvm.org/D60006
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@357765 91177308-0d34-0410-b5e6-96231b3b80d8
Second half of PR40800, this patch adds DAG undef handling to fcmp instructions to match the behavior in llvm::ConstantFoldCompareInstruction, this permits constant folding of vector comparisons where some elements had been reduced to UNDEF (by SimplifyDemandedVectorElts etc.).
This involves a lot of tweaking to reduced tests as bugpoint loves to reduce fcmp arguments to undef........
Differential Revision: https://reviews.llvm.org/D60006
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@357765 91177308-0d34-0410-b5e6-96231b3b80d8