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Sanjay Patel
254e234886
The test case from: https://bugs.llvm.org/show_bug.cgi?id=42771 ...shows a ~30x slowdown caused by the awkward loop iteration (rL207302) that is seemingly done just to avoid invalidating the instruction iterator. We can instead delay instruction deletion until we reach the end of the block (or we could delay until we reach the end of all blocks). There's a test diff here for a degenerate case with llvm.assume that is not meaningful in itself, but serves to verify this change in logic. This change probably doesn't result in much overall compile-time improvement because we call '-instsimplify' as a standalone pass only once in the standard -O2 opt pipeline currently. Differential Revision: https://reviews.llvm.org/D65336 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@367173 91177308-0d34-0410-b5e6-96231b3b80d8