04a309dd0b
Summary: The patch is not ready yet and is here to discuss a few options: - How do we customize the implementation? (i.e. how to define `kRepMovsBSize`), - How do we specify custom compilation flags? (We'd need `-fno-builtin-memcpy` to be passed in), - How do we build? We may want to test in debug but build the libc with `-march=native` for instance, - Clang has a brand new builtin `__builtin_memcpy_inline` which makes the implementation easy and efficient, but: - If we compile with `gcc` or `msvc` we can't use it, resorting on less efficient code generation, - With gcc we can use `__builtin_memcpy` but then we'd need a postprocess step to check that the final assembly do not contain call to `memcpy` (unlikely but allowed), - For msvc we'd need to resort on the compiler optimization passes. Reviewers: sivachandra, abrachet Subscribers: mgorny, MaskRay, tschuett, libc-commits, courbet Tags: #libc-project Differential Revision: https://reviews.llvm.org/D74397
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