[all-commits] [llvm/llvm-project] 67437d: [reland][libc] Switch to new implementation of mem...

[Guillaume Chatelet via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 67437dd0147e92fe601ef76d17dbbf171f638580
      https://github.com/llvm/llvm-project/commit/67437dd0147e92fe601ef76d17dbbf171f638580
  Author: Guillaume Chatelet <gchatelet at google.com>
  Date:   2022-11-02 (Wed, 02 Nov 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/memcpy.cpp
    M libc/src/string/memmove.cpp
    M libc/src/string/memory_utils/bcmp_implementations.h
    M libc/src/string/memory_utils/bzero_implementations.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
    M libc/src/string/memory_utils/op_x86.h
    M libc/src/string/mempcpy.cpp
    M libc/src/string/memset.cpp

  Log Message:
  -----------
  [reland][libc] Switch to new implementation of mem* functions

The new framework makes it explicit which processor feature is being
used and allows for easier per platform customization:
 - ARM cpu now uses trivial implementations to reduce code size.
 - Memcmp, Bcmp and Memmove have been optimized for x86
 - Bcmp has been optimized for aarch64.

This is a reland of https://reviews.llvm.org/D135134 (b3f1d58, 028414881381)

Reviewed By: courbet

Differential Revision: https://reviews.llvm.org/D136595