forked from OSchip/llvm-project
a079ef68e3
Summary: The comments in the code said // Remove <def,read-undef> flags. This def is now a partial redef. but the code didn't just remove read-undef, it could introduce new ones which could cause errors. E.g. if we have something like %vreg1<def> = IMPLICIT_DEF %vreg2:subreg1<def, read-undef> = op %vreg3, %vreg4 %vreg2:subreg2<def> = op %vreg6, %vreg7 and we merge %vreg1 and %vreg2 then we should not set undef on the second subreg def, which the old code did. Now we solve this by actually do what the code comment says. We remove read-undef flags rather than remove or introduce them. Reviewers: qcolombet, MatzeB Reviewed By: MatzeB Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D38616 llvm-svn: 315564 |
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