[PATCH] D82638: [MachineCopyPropagation] BackwardPropagatableCopy: add check for hasOverlappingMultipleDef
Kai Luo via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Wed Jul 29 08:27:02 PDT 2020
lkail added a comment.
In D82638#2118048 <https://reviews.llvm.org/D82638#2118048>, @efriedma wrote:
> If the definition is earlyclobber, do we also need to check for overlapping uses?
Prior `propagateDefs`, there is an invalidation of earlyclobber registers, so in `propagateDefs`, if `MODef` is earlyclobber, there should not be a corresponding COPY to propagate from.
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https://reviews.llvm.org/D82638/new/
https://reviews.llvm.org/D82638
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