[all-commits] [llvm/llvm-project] ddd2f5: [X86] Use NSW/NUW flags on ISD::TRUNCATE nodes to ...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ddd2f57b29661f21308eec0400fa92a6d075b0c6
      https://github.com/llvm/llvm-project/commit/ddd2f57b29661f21308eec0400fa92a6d075b0c6
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2025-01-24 (Fri, 24 Jan 2025)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    M llvm/test/CodeGen/X86/vector-trunc-nowrap.ll

  Log Message:
  -----------
  [X86] Use NSW/NUW flags on ISD::TRUNCATE nodes to improve X86 PACKSS/PACKUS lowering (#123956)

If the NSW/NUW flags are present, then we can assume the source value is within bounds and saturation will not occur with the PACKSS/PACKUS instructions.

Fixes #87485



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