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f9a3ecf57f
Summary: It was detected that the reassociate pass could enter an inifite loop when analysing dead code. Simply skipping to analyse basic blocks that are dead avoids such problems (and as a side effect we avoid spending time on optimising dead code). The solution is using the same Reverse Post Order ordering of the basic blocks when doing the optimisations, as when building the precalculated rank map. A nice side-effect of this solution is that we now know that we only try to do optimisations for blocks with ranked instructions. Fixes https://llvm.org/bugs/show_bug.cgi?id=30818 Reviewers: llvm-commits, davide, eli.friedman, mehdi_amini Subscribers: dberlin Differential Revision: https://reviews.llvm.org/D26154 llvm-svn: 285793 |
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