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d2c85e3ceb
As discussed in PR42696: https://bugs.llvm.org/show_bug.cgi?id=42696 ...but won't help that case yet. We have an odd situation where a select operand equivalence fold was implemented in InstSimplify when it could have been done more generally in InstCombine if we allow dropping of {nsw,nuw,exact} from a binop operand. Here's an example: https://rise4fun.com/Alive/Xplr %cmp = icmp eq i32 %x, 2147483647 %add = add nsw i32 %x, 1 %sel = select i1 %cmp, i32 -2147483648, i32 %add => %sel = add i32 %x, 1 I've left the InstSimplify code in place for now, but my guess is that we'd prefer to remove that as a follow-up to save on code duplication and compile-time. Differential Revision: https://reviews.llvm.org/D65576 llvm-svn: 367695
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