[all-commits] [llvm/llvm-project] 947667: [X86] Lower vXi8 multiplies by constant using PMAD...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 9476671dc3fa13b1cd39f5de796f501539441a21
      https://github.com/llvm/llvm-project/commit/9476671dc3fa13b1cd39f5de796f501539441a21
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2024-06-15 (Sat, 15 Jun 2024)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    M llvm/lib/Target/X86/X86MCInstLower.cpp
    M llvm/test/CodeGen/X86/combine-mul.ll
    M llvm/test/CodeGen/X86/gfni-shifts.ll
    M llvm/test/CodeGen/X86/pmul.ll
    M llvm/test/CodeGen/X86/srem-seteq-vec-nonsplat.ll
    M llvm/test/CodeGen/X86/vector-fshr-128.ll
    M llvm/test/CodeGen/X86/vector-fshr-256.ll
    M llvm/test/CodeGen/X86/vector-fshr-512.ll
    M llvm/test/CodeGen/X86/vector-idiv-sdiv-128.ll
    M llvm/test/CodeGen/X86/vector-idiv-sdiv-256.ll
    M llvm/test/CodeGen/X86/vector-idiv-sdiv-512.ll
    M llvm/test/CodeGen/X86/vector-idiv-udiv-128.ll
    M llvm/test/CodeGen/X86/vector-idiv-udiv-256.ll
    M llvm/test/CodeGen/X86/vector-idiv-udiv-512.ll
    M llvm/test/CodeGen/X86/vector-mul.ll
    M llvm/test/CodeGen/X86/vector-shift-shl-128.ll
    M llvm/test/CodeGen/X86/vector-shift-shl-256.ll
    M llvm/test/CodeGen/X86/vector-shift-shl-512.ll

  Log Message:
  -----------
  [X86] Lower vXi8 multiplies by constant using PMADDUBSW on SSSE3+ targets (#95403)

As discussed on #90748 - we can avoid unpacks/extensions from vXi8 to vXi16 by using PMADDUBSW instead and packing the vXi16 results back together.



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