[all-commits] [llvm/llvm-project] 1249ab: [CIR] Add bit ffs operation (#150997)

[Sirui Mu via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 1249ab9a0364805c84dc57b57fc4e85c1c7d5d69
      https://github.com/llvm/llvm-project/commit/1249ab9a0364805c84dc57b57fc4e85c1c7d5d69
  Author: Sirui Mu <msrlancern at gmail.com>
  Date:   2025-07-29 (Tue, 29 Jul 2025)

  Changed paths:
    M clang/include/clang/CIR/Dialect/IR/CIROps.td
    M clang/lib/CIR/CodeGen/CIRGenBuiltin.cpp
    M clang/lib/CIR/Dialect/IR/CIRDialect.cpp
    M clang/lib/CIR/Dialect/Transforms/CIRCanonicalize.cpp
    M clang/lib/CIR/Lowering/DirectToLLVM/LowerToLLVM.cpp
    M clang/lib/CIR/Lowering/DirectToLLVM/LowerToLLVM.h
    M clang/test/CIR/CodeGen/builtin_bit.cpp
    M clang/test/CIR/Transforms/bit.cir

  Log Message:
  -----------
  [CIR] Add bit ffs operation (#150997)

This patch adds the `cir.ffs` operation which corresponds to the
`__builtin_ffs` family of builtin functions.

This operation was not included in the previous PRs because the call to
`__builtin_ffs` would be transformed into a library call to `ffs`. At
the time of authoring this patch, this behavior has been changed and now
we can properly lower calls to `__builtin_ffs` to `cir.ffs`.



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