[all-commits] [llvm/llvm-project] 8b1283: [clang] Introduce elementwise ctlz/cttz builtins (...

[Fraser Cormack via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 8b128388b527ac196e06115dd2496e2e9d59e565
      https://github.com/llvm/llvm-project/commit/8b128388b527ac196e06115dd2496e2e9d59e565
  Author: Fraser Cormack <fraser at codeplay.com>
  Date:   2025-08-20 (Wed, 20 Aug 2025)

  Changed paths:
    M clang/docs/LanguageExtensions.rst
    M clang/include/clang/Basic/Builtins.td
    M clang/include/clang/Basic/DiagnosticASTKinds.td
    M clang/lib/AST/ByteCode/InterpBuiltin.cpp
    M clang/lib/AST/ExprConstant.cpp
    M clang/lib/CodeGen/CGBuiltin.cpp
    M clang/lib/Sema/SemaChecking.cpp
    M clang/test/CodeGen/builtins-elementwise-math.c
    M clang/test/Sema/builtins-elementwise-math.c
    M clang/test/Sema/constant-builtins-vector.cpp

  Log Message:
  -----------
  [clang] Introduce elementwise ctlz/cttz builtins (#131995)

These builtins are modeled on the clzg/ctzg builtins, which accept an
optional second argument. This second argument is returned if the first
argument is 0. These builtins unconditionally exhibit zero-is-undef
behaviour, regardless of target preference for the other ctz/clz
builtins. The builtins have constexpr support.

Fixes #154113



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