[all-commits] [llvm/llvm-project] 4c1943: [libc] New version of the mem* framework

[Guillaume Chatelet via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 4c19439d249256db720e323a446e39d05496732f
      https://github.com/llvm/llvm-project/commit/4c19439d249256db720e323a446e39d05496732f
  Author: Guillaume Chatelet <gchatelet at google.com>
  Date:   2022-10-12 (Wed, 12 Oct 2022)

  Changed paths:
    M libc/src/stdio/printf_core/string_writer.cpp
    M libc/src/string/bcmp.cpp
    M libc/src/string/memcmp.cpp
    M libc/src/string/memmove.cpp
    M libc/src/string/memory_utils/CMakeLists.txt
    A libc/src/string/memory_utils/README.md
    M libc/src/string/memory_utils/bcmp_implementations.h
    R libc/src/string/memory_utils/elements.h
    R libc/src/string/memory_utils/elements_aarch64.h
    R libc/src/string/memory_utils/elements_x86.h
    M libc/src/string/memory_utils/memcmp_implementations.h
    M libc/src/string/memory_utils/memcpy_implementations.h
    M libc/src/string/memory_utils/memset_implementations.h
    A libc/src/string/memory_utils/op_aarch64.h
    A libc/src/string/memory_utils/op_builtin.h
    A libc/src/string/memory_utils/op_generic.h
    A libc/src/string/memory_utils/op_x86.h
    M libc/src/string/memory_utils/utils.h
    M libc/src/string/memset.cpp
    M libc/test/src/string/bcmp_test.cpp
    M libc/test/src/string/memmove_test.cpp
    M libc/test/src/string/memory_utils/CMakeLists.txt
    R libc/test/src/string/memory_utils/elements_test.cpp
    R libc/test/src/string/memory_utils/memory_access_test.cpp
    M libc/test/src/string/memory_utils/utils_test.cpp
    M utils/bazel/llvm-project-overlay/libc/BUILD.bazel

  Log Message:
  -----------
  [libc] New version of the mem* framework

This version is more composable and also simpler at the expense of being more explicit and more verbose.
This patch is not meant to be submitted but gives an idea of the change.
Codegen can be checked in https://godbolt.org/z/6z1dEoWbs by removing the "static inline" before individual functions.

Unittests are coming.

Suggested review order:
 - utils
 - op_base
 - op_builtin
 - op_generic
 - op_x86 / op_aarch64
 - *_implementations.h

Differential Revision: https://reviews.llvm.org/D135134