[all-commits] [llvm/llvm-project] af029d: [libc][reland] Fix builtin definition for memory f...

[michaelrj-google via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: af029d383a24ee454e1124f64f3427d5b79e5f7e
      https://github.com/llvm/llvm-project/commit/af029d383a24ee454e1124f64f3427d5b79e5f7e
  Author: Michael Jones <michaelrj at google.com>
  Date:   2022-11-18 (Fri, 18 Nov 2022)

  Changed paths:
    M libc/cmake/modules/LLVMLibCCheckCpuFeatures.cmake
    M libc/src/string/CMakeLists.txt
    M libc/src/string/memory_utils/op_x86.h

  Log Message:
  -----------
  [libc][reland] Fix builtin definition for memory functions

The memory functions are highly performance sensitive and use builtins
where possible, but also need to define those functions names when they
don't exist to avoid compilation errors. Previously all those
redefinitions were behind the SSE2 flag for x86, which caused errors on
CPUs that supported SSE2 but not AVX512. This patch splits the various
CPU extensions out to avoid errors on such CPUs.

Reviewed By: gchatelet

Differential Revision: https://reviews.llvm.org/D138163