[all-commits] [llvm/llvm-project] b75ab5: [AMDGPU] Match bitsin(typeof(x)) - ctpop(x) to s_b...

[Patrick Simmons via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b75ab58e83301a56e958ea011fd851c88d976fe5
      https://github.com/llvm/llvm-project/commit/b75ab58e83301a56e958ea011fd851c88d976fe5
  Author: Patrick Simmons <patrick.simmons at amd.com>
  Date:   2026-07-30 (Thu, 30 Jul 2026)

  Changed paths:
    M llvm/lib/Target/AMDGPU/SOPInstructions.td
    A llvm/test/CodeGen/AMDGPU/s_bcnt0.ll
    M llvm/test/CodeGen/AMDGPU/s_cmp_0.ll

  Log Message:
  -----------
  [AMDGPU] Match bitsin(typeof(x)) - ctpop(x) to s_bcnt0_i32 (#164847)

This PR optimizes the pattern bitsin(typeof(x)) - popcnt(x) to
s_bcnt0_i32 on AMDGPU. It also creates a Clang builtin for s_bcnt0_i32
so that users can call this instruction directly instead of relying on
the compiler to match this pattern.



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