[all-commits] [llvm/llvm-project] 68a77b: [CIR][AMDGPU] Implement inverse_ballot and read_ex...

[Steffen Larsen via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 68a77b6106d375eabb8a7ec2585a0f3e0382c4a2
      https://github.com/llvm/llvm-project/commit/68a77b6106d375eabb8a7ec2585a0f3e0382c4a2
  Author: Steffen Larsen <sholstla at amd.com>
  Date:   2026-09-09 (Wed, 09 Sep 2026)

  Changed paths:
    M clang/lib/CIR/CodeGen/CIRGenBuiltinAMDGPU.cpp
    M clang/test/CIR/CodeGenHIP/builtins-amdgcn-wave32.hip
    M clang/test/CIR/CodeGenHIP/builtins-amdgcn-wave64.hip

  Log Message:
  -----------
  [CIR][AMDGPU] Implement inverse_ballot and read_exec codegen (#221661)

This commit implements the CIR codegen for the following AMDGPU
builtins:
- __builtin_amdgcn_inverse_ballot_w32
- __builtin_amdgcn_inverse_ballot_w64
- __builtin_amdgcn_read_exec
- __builtin_amdgcn_read_exec_lo
- __builtin_amdgcn_read_exec_hi

inverse_ballot_w32/w64 map to llvm.amdgcn.inverse.ballot. read_exec,
read_exec_lo and read_exec_hi read the exec mask as a ballot over an
all-true predicate, at least as wide as the wavefront.



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