[all-commits] [llvm/llvm-project] 751a54: [HLSL][DXIL][SPIRV] WavePrefixSum intrinsic suppor...

[Kai via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 751a546fa9bb887d9526508220644f9dd806004b
      https://github.com/llvm/llvm-project/commit/751a546fa9bb887d9526508220644f9dd806004b
  Author: Kai <47328809+kcloudy0717 at users.noreply.github.com>
  Date:   2026-02-03 (Tue, 03 Feb 2026)

  Changed paths:
    M clang/include/clang/Basic/Builtins.td
    M clang/lib/CodeGen/CGHLSLBuiltins.cpp
    M clang/lib/Headers/hlsl/hlsl_alias_intrinsics.h
    M clang/lib/Sema/SemaHLSL.cpp
    A clang/test/CodeGenHLSL/builtins/WavePrefixSum.hlsl
    A clang/test/SemaHLSL/BuiltIns/WavePrefixSum-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/DXILShaderFlags.cpp
    M llvm/lib/Target/DirectX/DirectXTargetTransformInfo.cpp
    M llvm/lib/Target/SPIRV/SPIRVInstructionSelector.cpp
    M llvm/test/CodeGen/DirectX/ShaderFlags/wave-ops.ll
    A llvm/test/CodeGen/DirectX/WavePrefixSum.ll
    A llvm/test/CodeGen/SPIRV/hlsl-intrinsics/WavePrefixSum.ll

  Log Message:
  -----------
  [HLSL][DXIL][SPIRV] WavePrefixSum intrinsic support (#167946)

Issue: https://github.com/llvm/llvm-project/issues/99172
- [x] Implement `WavePrefixSum` clang builtin
- [x] Link `WavePrefixSum` clang builtin with `hlsl_intrinsics.h`
- [x] Add sema checks for `WavePrefixSum` to
`CheckHLSLBuiltinFunctionCall` in `SemaChecking.cpp`
- [x] Add codegen for `WavePrefixSum` to `EmitHLSLBuiltinExpr` in
`CGBuiltin.cpp`
- [x] Add codegen tests to
`clang/test/CodeGenHLSL/builtins/WavePrefixSum.hlsl`
- [x] Add sema tests to
`clang/test/SemaHLSL/BuiltIns/WavePrefixSum-errors.hlsl`
- [x] Create the `int_dx_WavePrefixSum` intrinsic in
`IntrinsicsDirectX.td`
- [x] Create the `DXILOpMapping` of `int_dx_WavePrefixSum` to `121` in
`DXIL.td`
- [x] Create the `WavePrefixSum.ll` and `WavePrefixSum_errors.ll` tests
in `llvm/test/CodeGen/DirectX/`
- [x] Create the `int_spv_WavePrefixSum` intrinsic in
`IntrinsicsSPIRV.td`
- [x] In SPIRVInstructionSelector.cpp create the `WavePrefixSum`
lowering and map it to `int_spv_WavePrefixSum` in
`SPIRVInstructionSelector::selectIntrinsic`.
- [x] Create SPIR-V backend test case in
`llvm/test/CodeGen/SPIRV/hlsl-intrinsics/WavePrefixSum.ll`

I also added a new macro
`GENERATE_HLSL_INTRINSIC_FUNCTION_SELECT_UNSIGNED` in conjunction with
the new function `getUnsignedIntrinsicVariant` to make selecting
unsigned variants of the intrinsic easier. As a result, I was able to
replace `getWaveActiveSumIntrinsic`, `getWaveActiveMaxIntrinsic`, and
`getWaveActiveMinIntrinsic` using the new macro.



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