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Mirror of https://github.com/RPCS3/llvm-mirror
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Currently we drop wrapping flags for expressions like (A + C1)<flags> - C2. But we can retain flags under certain conditions: * Adding a smaller constant is NUW if the original AddExpr was NUW. * Adding a constant with the same sign and small magnitude is NSW, if the original AddExpr was NSW. This can improve results after using `SimplifyICmpOperands`, which may subtract one in order to use stricter predicates, as is the case for `isKnownPredicate`. Reviewed By: efriedma Differential Revision: https://reviews.llvm.org/D104319 |
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