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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
This directory contains tests for the MIR file format parser and printer. It was necessary to split the tests across different targets as no single target covers all features available in machine IR. Tests for codegen passes should NOT be here but in test/CodeGen/sometarget. As a rule of thumb this directory should only contain tests using 'llc -run-pass none'.