libc/src/string/memory_utils/aarch64/memcpy_implementations.h

   1 //===-- Memcpy implementation for aarch64 -----------------------*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 #ifndef LIBC_SRC_STRING_MEMORY_UTILS_AARCH64_MEMCPY_IMPLEMENTATIONS_H
   9 #define LIBC_SRC_STRING_MEMORY_UTILS_AARCH64_MEMCPY_IMPLEMENTATIONS_H
  10
  11 #include "src/__support/macros/config.h" // LIBC_INLINE
  12 #include "src/string/memory_utils/op_builtin.h"
  13 #include "src/string/memory_utils/utils.h"
  14
  15 #include <stddef.h> // size_t
  16
  17 namespace __llvm_libc {
  18
  19 [[maybe_unused]] LIBC_INLINE void
  20 inline_memcpy_aarch64(Ptr __restrict dst, CPtr __restrict src, size_t count) {
  21   if (count == 0)
  22     return;
  23   if (count == 1)
  24     return builtin::Memcpy<1>::block(dst, src);
  25   if (count == 2)
  26     return builtin::Memcpy<2>::block(dst, src);
  27   if (count == 3)
  28     return builtin::Memcpy<3>::block(dst, src);
  29   if (count == 4)
  30     return builtin::Memcpy<4>::block(dst, src);
  31   if (count < 8)
  32     return builtin::Memcpy<4>::head_tail(dst, src, count);
  33   if (count < 16)
  34     return builtin::Memcpy<8>::head_tail(dst, src, count);
  35   if (count < 32)
  36     return builtin::Memcpy<16>::head_tail(dst, src, count);
  37   if (count < 64)
  38     return builtin::Memcpy<32>::head_tail(dst, src, count);
  39   if (count < 128)
  40     return builtin::Memcpy<64>::head_tail(dst, src, count);
  41   builtin::Memcpy<16>::block(dst, src);
  42   align_to_next_boundary<16, Arg::Src>(dst, src, count);
  43   return builtin::Memcpy<64>::loop_and_tail(dst, src, count);
  44 }
  45
  46 } // namespace __llvm_libc
  47
  48 #endif // LIBC_SRC_STRING_MEMORY_UTILS_AARCH64_MEMCPY_IMPLEMENTATIONS_H