[all-commits] [llvm/llvm-project] 4877c5: [SPIRV] Add PreLegalizer pattern matching for `fac...

[Kaitlin Peng via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 4877c593a873657cd18a1ee0bd4a13f4b84c4d3b
      https://github.com/llvm/llvm-project/commit/4877c593a873657cd18a1ee0bd4a13f4b84c4d3b
  Author: Kaitlin Peng <kaitlinpeng at microsoft.com>
  Date:   2025-11-25 (Tue, 25 Nov 2025)

  Changed paths:
    M llvm/lib/Target/SPIRV/SPIRVCombine.td
    M llvm/lib/Target/SPIRV/SPIRVCombinerHelper.cpp
    M llvm/lib/Target/SPIRV/SPIRVCombinerHelper.h
    A llvm/test/CodeGen/SPIRV/GlobalISel/InstCombine/prelegalizercombiner-select-to-faceforward.mir
    M llvm/test/CodeGen/SPIRV/hlsl-intrinsics/faceforward.ll
    A llvm/test/CodeGen/SPIRV/opencl/faceforward-error.ll
    A llvm/test/CodeGen/SPIRV/opencl/faceforward.ll

  Log Message:
  -----------
  [SPIRV] Add PreLegalizer pattern matching for `faceforward` (#139959)

Tasks completed:
- Pattern match`select(fcmp(dot(p2, p3), 0), p1, -p1)` to
`faceforward(p1, p2, p3)`
- Add pattern matching tests to
`prelegalizercombiner-select-to-faceforward.mir` and `faceforward.ll`
- Add CL extension error test
`llvm/test/CodeGen/SPIRV/opencl/faceforward-error.ll`
- Add CL extension test for no pattern matching in
`llvm/test/CodeGen/SPIRV/opencl/faceforward.ll`

Closes #137255.



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