| #include "src/string/memory_utils/memcpy_utils.h" |
| |
| namespace __llvm_libc { |
| |
| static void CopyRepMovsb(char *__restrict dst, const char *__restrict src, |
| size_t count) { |
| // FIXME: Add MSVC support with |
| // #include <intrin.h> |
| // __movsb(reinterpret_cast<unsigned char *>(dst), |
| // reinterpret_cast<const unsigned char *>(src), count); |
| asm volatile("rep movsb" : "+D"(dst), "+S"(src), "+c"(count) : : "memory"); |
| } |
| |
| #if defined(__AVX__) |
| #define BEST_SIZE 64 |
| #else |
| #define BEST_SIZE 32 |
| #endif |
| |
| static void CopyGE128(char *__restrict dst, const char *__restrict src, |
| size_t count) { |
| #if defined(__AVX__) |
| if (count < 256) |
| return CopyOverlap<128>(dst, src, count); |
| #endif |
| // kRepMovsBSize == -1 : Only CopyAligned is used. |
| // kRepMovsBSize == 0 : Only RepMovsb is used. |
| // else CopyAligned is used to to kRepMovsBSize and then RepMovsb. |
| constexpr size_t kRepMovsBSize = -1; |
| if (count <= kRepMovsBSize) |
| return CopyAligned<BEST_SIZE>(dst, src, count); |
| CopyRepMovsb(dst, src, count); |
| } |
| |
| } // namespace __llvm_libc |
