[SCEV] Commute sign extends through nsw multiplication #163840
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When NSW flag is present, SCEV simplifies sext((A * B * ...)<nsw>) to (sext(A) * sext(B) * ...)<nsw>.
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Currently, a couple of test cases are failed after this change and need to be fixed. LLVM :: CodeGen/X86/avx512vnni-combine.ll
LLVM :: CodeGen/X86/avxvnni-combine.ll
LLVM :: Transforms/IndVarSimplify/add-nsw-zext-fold.ll
LLVM :: Transforms/LoopStrengthReduce/X86/pr47776-do-not-apply-info-from-guards-to-addrecs.ll
LLVM :: Transforms/LoopUnroll/runtime-loop-multiple-exits.ll``` |
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When NSW flag is present, SCEV simplifies sext((A * B * ...)<nsw>) to (sext(A) * sext(B) * ...)<nsw>.