[libc-commits] [PATCH] D94692: [libc] Allow customization of memcpy via flags.

[Guillaume Chatelet via Phabricator via libc-commits]

gchatelet created this revision.
gchatelet added a reviewer: sivachandra.
Herald added subscribers: libc-commits, ecnelises, tschuett, pengfei.
Herald added a project: libc-project.
gchatelet requested review of this revision.

- Adds LLVM_LIBC_IS_DEFINED macro to libc/src/__support/common.h
- Adds a few knobs to memcpy to help with experimentations:
  - LLVM_LIBC_MEMCPY_X86_USE_ONLY_REPMOVSB replaces the implementation with a single call to rep;movsb
  - LLVM_LIBC_MEMCPY_X86_USE_REPMOVSB_FROM_SIZE customizes where the usage of rep;movsb


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D94692

Files:
  libc/src/__support/common.h
  libc/src/string/x86/memcpy.cpp

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