[PATCH] D135020: [GlobalISel] Combine `undef / X -> 0` and `undef % X -> 0`
Jessica Paquette via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Sat Oct 1 13:42:07 PDT 2022
paquette created this revision.
paquette added reviewers: aemerson, jroelofs, arsenm.
Herald added subscribers: steven.zhang, rovka.
Herald added a project: All.
paquette requested review of this revision.
Herald added a subscriber: wdng.
Herald added a project: LLVM.
This fixes the `urem_undef_lhs` case in the following:
https://gcc.godbolt.org/z/Wo9x7o679
Also see https://github.com/llvm/llvm-project/issues/57256 for more related bugs.
This is equivalent to the undef bits in `simplifyDivRem` in the DAGCombiner.
https://reviews.llvm.org/D135020
Files:
llvm/include/llvm/Target/GlobalISel/Combine.td
llvm/test/CodeGen/AArch64/GlobalISel/combine-binop-undef-left-to-zero.mir
llvm/test/CodeGen/AArch64/GlobalISel/combine-shl.mir
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