[all-commits] [llvm/llvm-project] f60f7b: [InstCombine][X86] Add multiply-by-one handling fo...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: f60f7b47a92dbf2f3d994868d3cd43b86a18a76c
      https://github.com/llvm/llvm-project/commit/f60f7b47a92dbf2f3d994868d3cd43b86a18a76c
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2024-07-03 (Wed, 03 Jul 2024)

  Changed paths:
    M llvm/lib/Target/X86/X86InstCombineIntrinsic.cpp
    M llvm/test/Transforms/InstCombine/X86/x86-pmulh.ll
    M llvm/test/Transforms/InstCombine/X86/x86-pmulhu.ll

  Log Message:
  -----------
  [InstCombine][X86] Add multiply-by-one handling for MULH/PMULHU/PMULHRS intrinsics

MULH/PMULHU simplifies to ASHR/ZERO as they just become a SEXT/ZEXT sign-splat instruction

PMULHRS doesn't simplify as much so I've not attempted to fold it.



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