[all-commits] [llvm/llvm-project] 4f48ab: [HLSL] Implement elementwise firstbitlow builtin (...

[Ashley Coleman via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 4f48abff0fb90ea0a05470755b799cdb1ff79d89
      https://github.com/llvm/llvm-project/commit/4f48abff0fb90ea0a05470755b799cdb1ff79d89
  Author: Ashley Coleman <ascoleman at microsoft.com>
  Date:   2025-01-15 (Wed, 15 Jan 2025)

  Changed paths:
    M clang/include/clang/Basic/Builtins.td
    M clang/lib/CodeGen/CGBuiltin.cpp
    M clang/lib/CodeGen/CGHLSLRuntime.h
    M clang/lib/Headers/hlsl/hlsl_intrinsics.h
    M clang/lib/Sema/SemaHLSL.cpp
    A clang/test/CodeGenHLSL/builtins/firstbitlow.hlsl
    M clang/test/SemaHLSL/BuiltIns/firstbithigh-errors.hlsl
    A clang/test/SemaHLSL/BuiltIns/firstbitlow-errors.hlsl
    M llvm/include/llvm/IR/IntrinsicsDirectX.td
    M llvm/include/llvm/IR/IntrinsicsSPIRV.td
    M llvm/lib/Target/DirectX/DXIL.td
    M llvm/lib/Target/DirectX/DirectXTargetTransformInfo.cpp
    M llvm/lib/Target/SPIRV/SPIRVInstructionSelector.cpp
    A llvm/test/CodeGen/DirectX/firstbitlow.ll
    A llvm/test/CodeGen/DirectX/firstbitlow_error.ll
    M llvm/test/CodeGen/SPIRV/hlsl-intrinsics/firstbithigh.ll
    A llvm/test/CodeGen/SPIRV/hlsl-intrinsics/firstbitlow.ll

  Log Message:
  -----------
  [HLSL] Implement elementwise firstbitlow builtin (#116858)

Closes https://github.com/llvm/llvm-project/issues/99116

Implements `firstbitlow` by extracting common functionality from
`firstbithigh` into a shared function while also fixing a bug for an edge
case where `u64x3` and larger vectors will attempt to create vectors
larger than the SPRIV max of 4.
---------

Co-authored-by: Steven Perron <stevenperron at google.com>



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