[all-commits] [llvm/llvm-project] 4b22a9: [IndVars] Mark truncs as nuw/nsw (#88686)

[Nikita Popov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 4b22a923c4bfd0aa1d483149f84b6787263c2d76
      https://github.com/llvm/llvm-project/commit/4b22a923c4bfd0aa1d483149f84b6787263c2d76
  Author: Nikita Popov <npopov at redhat.com>
  Date:   2024-04-16 (Tue, 16 Apr 2024)

  Changed paths:
    M llvm/include/llvm/IR/IRBuilder.h
    M llvm/lib/Transforms/Utils/SimplifyIndVar.cpp
    M llvm/test/Transforms/IndVarSimplify/AArch64/widen-loop-comp.ll
    M llvm/test/Transforms/IndVarSimplify/X86/iv-widen.ll
    M llvm/test/Transforms/IndVarSimplify/elim-extend.ll
    M llvm/test/Transforms/IndVarSimplify/hoist-wide-inc-for-narrow-use-recompute-flags.ll
    M llvm/test/Transforms/IndVarSimplify/iv-sext.ll
    M llvm/test/Transforms/IndVarSimplify/iv-widen-elim-ext.ll
    M llvm/test/Transforms/IndVarSimplify/lftr.ll
    M llvm/test/Transforms/IndVarSimplify/no-iv-rewrite.ll
    M llvm/test/Transforms/IndVarSimplify/post-inc-range.ll
    M llvm/test/Transforms/IndVarSimplify/pr25578.ll
    M llvm/test/Transforms/IndVarSimplify/pr55925.ll
    M llvm/test/Transforms/IndVarSimplify/widen-nonnegative-countdown.ll
    M llvm/test/Transforms/IndVarSimplify/widen-nonnegative.ll
    M llvm/test/Transforms/LoopFlatten/widen-iv3.ll

  Log Message:
  -----------
  [IndVars] Mark truncs as nuw/nsw (#88686)

When inserting truncs during IV widening, mark the trunc as either nuw
or nsw depending on whether zext or sext widening was used. For
non-negative IVs both nuw and nsw apply.



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