[all-commits] [llvm/llvm-project] 8269fd: [GlobalIsel][X86] Add initial scalar G_MUL/G_SMULH...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 8269fd2db50bf97ae3b6e928365d157314e491c8
      https://github.com/llvm/llvm-project/commit/8269fd2db50bf97ae3b6e928365d157314e491c8
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2023-07-02 (Sun, 02 Jul 2023)

  Changed paths:
    M llvm/lib/Target/X86/X86InstructionSelector.cpp
    M llvm/lib/Target/X86/X86LegalizerInfo.cpp
    M llvm/test/CodeGen/X86/GlobalISel/legalize-mul-scalar.mir
    M llvm/test/CodeGen/X86/GlobalISel/mul-scalar.ll

  Log Message:
  -----------
  [GlobalIsel][X86] Add initial scalar G_MUL/G_SMULH/G_UMULH instruction selection handling

Reuse the existing div/rem selection code to also handle mul/imul to support G_MUL/G_SMULH/G_UMULH, as they have a similar pattern using rDX/rAX for mulh/mul results, plus the AH/AL support for i8 multiplies.