[all-commits] [llvm/llvm-project] 2f4c38: Move KCFI type ID hash helpers out of LLVMSupport ...

[Fangrui Song via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 2f4c387147f1617e242dd500960410728e5ec35e
      https://github.com/llvm/llvm-project/commit/2f4c387147f1617e242dd500960410728e5ec35e
  Author: Fangrui Song <i at maskray.me>
  Date:   2026-05-10 (Sun, 10 May 2026)

  Changed paths:
    M clang/include/clang/Basic/CodeGenOptions.h
    M clang/lib/CodeGen/CodeGenModule.cpp
    R llvm/include/llvm/Support/Hash.h
    M llvm/include/llvm/Support/xxhash.h
    A llvm/include/llvm/Transforms/Utils/KCFIHash.h
    M llvm/lib/Support/CMakeLists.txt
    R llvm/lib/Support/Hash.cpp
    M llvm/lib/Support/xxhash.cpp
    M llvm/lib/Transforms/Utils/CMakeLists.txt
    A llvm/lib/Transforms/Utils/KCFIHash.cpp
    M llvm/lib/Transforms/Utils/ModuleUtils.cpp
    M llvm/unittests/Support/xxhashTest.cpp

  Log Message:
  -----------
  Move KCFI type ID hash helpers out of LLVMSupport (#196784)

PR #167254 inappropriately introduced llvm/Support/Hash.{h,cpp} for the
KCFI helpers. The name is misleading — it has nothing to do with the
generic hashing facility in llvm/ADT/Hashing.h — and KCFI is a
CodeGen/IR feature that does not belong in the foundational Support
layer.

Move the files to llvm/lib/Transforms/Utils/KCFIHash.cpp, alongside
setKCFIType, which is the only existing KCFI helper in TransformUtils.

Also relocate the deprecated pre-xxh3 xxHash64 implementation into
KCFIHash.cpp, the sole user. clang/test/CodeGen/kcfi-generalize.c and
kcfi-normalize.c are end-to-end regression tests for the xxHash64 output



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