user: Demonstrate the C code that generates the assembly output below:

```asm
<rte_memcpy_func>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x30,%rsp
  mov    %rdi,-0x18(%rbp)
  mov    %rsi,-0x20(%rbp)
  mov    %rdx,-0x28(%rbp)
  mov    -0x18(%rbp),%rax
  mov    %rax,-0x8(%rbp)
  cmpq   $0xf,-0x28(%rbp)
  ja     L45
  mov    -0x28(%rbp),%rax
  and    $0x1,%eax
  test   %rax,%rax
  je     L235
  mov    -0x20(%rbp),%rax
  mov    (%rax),%edx
  mov    -0x18(%rbp),%rax
  mov    %edx,(%rax)
  addq   $0x4,-0x18(%rbp)
  addq   $0x4,-0x20(%rbp)
L235:
  mov    -0x28(%rbp),%rax
  and    $0x2,%eax
  test   %rax,%rax
  je     L72
  mov    -0x20(%rbp),%rax
  mov    (%rax),%edx
  mov    -0x18(%rbp),%rax
  mov    %edx,(%rax)
  addq   $0x4,-0x18(%rbp)
  addq   $0x4,-0x20(%rbp)
L72:
  mov    -0x28(%rbp),%rax
  and    $0x4,%eax
  test   %rax,%rax
  je     L7
  mov    -0x20(%rbp),%rax
  mov    (%rax),%edx
  mov    -0x18(%rbp),%rax
  mov    %edx,(%rax)
  addq   $0x4,-0x18(%rbp)
  addq   $0x4,-0x20(%rbp)
L7:
  mov    -0x28(%rbp),%rax
  and    $0x8,%eax
  test   %rax,%rax
  je     L150
  mov    -0x20(%rbp),%rax
  mov    (%rax),%edx
  mov    -0x18(%rbp),%rax
  mov    %edx,(%rax)
L150:
  mov    -0x8(%rbp),%rax
  jmp    L213
L45:
  cmpq   $0x20,-0x28(%rbp)
  ja     L208
  mov    -0x20(%rbp),%rdx
  mov    -0x18(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <rte_mov16@plt>
  mov    -0x28(%rbp),%rax
  shl    $0x2,%rax
  lea    -0x40(%rax),%rdx
  mov    -0x20(%rbp),%rax
  add    %rax,%rdx
  mov    -0x28(%rbp),%rax
  shl    $0x2,%rax
  lea    -0x40(%rax),%rcx
  mov    -0x18(%rbp),%rax
  add    %rcx,%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <rte_mov16@plt>
  mov    -0x8(%rbp),%rax
  jmp    L213
L208:
  cmpq   $0x40,-0x28(%rbp)
  ja     L202
  mov    -0x20(%rbp),%rdx
  mov    -0x18(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <rte_mov32@plt>
  mov    -0x28(%rbp),%rax
  shl    $0x2,%rax
  lea    -0x80(%rax),%rdx
  mov    -0x20(%rbp),%rax
  add    %rax,%rdx
  mov    -0x28(%rbp),%rax
  shl    $0x2,%rax
  lea    -0x80(%rax),%rcx
  mov    -0x18(%rbp),%rax
  add    %rcx,%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <rte_mov32@plt>
  mov    -0x8(%rbp),%rax
  jmp    L213
L202:
  cmpq   $0x80,-0x28(%rbp)
  ja     L32
  mov    -0x20(%rbp),%rdx
  mov    -0x18(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <rte_mov64@plt>
  mov    -0x28(%rbp),%rax
  shl    $0x2,%rax
  lea    -0x100(%rax),%rdx
  mov    -0x20(%rbp),%rax
  add    %rax,%rdx
  mov    -0x28(%rbp),%rax
  shl    $0x2,%rax
  lea    -0x100(%rax),%rcx
  mov    -0x18(%rbp),%rax
  add    %rcx,%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <rte_mov64@plt>
  mov    -0x8(%rbp),%rax
  jmp    L213
L183:
  mov    -0x20(%rbp),%rdx
  mov    -0x18(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <rte_mov256@plt>
  addq   $0x400,-0x18(%rbp)
  addq   $0x400,-0x20(%rbp)
  subq   $0x100,-0x28(%rbp)
L32:
  cmpq   $0xff,-0x28(%rbp)
  ja     L183
  mov    -0x28(%rbp),%rax
  shr    $0x6,%rax
  mov    %rax,%rdx
  mov    $0x3,%eax
  sub    %rdx,%rax
  cmp    $0x2,%rax
  je     L138
  cmp    $0x2,%rax
  ja     L236
  test   %rax,%rax
  je     L92
  cmp    $0x1,%rax
  je     L59
  jmp    L236
L92:
  mov    -0x20(%rbp),%rdx
  mov    -0x18(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <rte_mov64@plt>
  subq   $0x40,-0x28(%rbp)
  addq   $0x100,-0x18(%rbp)
  addq   $0x100,-0x20(%rbp)
L59:
  mov    -0x20(%rbp),%rdx
  mov    -0x18(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <rte_mov64@plt>
  subq   $0x40,-0x28(%rbp)
  addq   $0x100,-0x18(%rbp)
  addq   $0x100,-0x20(%rbp)
L138:
  mov    -0x20(%rbp),%rdx
  mov    -0x18(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <rte_mov64@plt>
  subq   $0x40,-0x28(%rbp)
  addq   $0x100,-0x18(%rbp)
  addq   $0x100,-0x20(%rbp)
L236:
  mov    -0x28(%rbp),%rax
  shr    $0x4,%rax
  mov    %rax,%rdx
  mov    $0x3,%eax
  sub    %rdx,%rax
  cmp    $0x2,%rax
  je     L191
  cmp    $0x2,%rax
  ja     L47
  test   %rax,%rax
  je     L69
  cmp    $0x1,%rax
  je     L91
  jmp    L47
L69:
  mov    -0x20(%rbp),%rdx
  mov    -0x18(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <rte_mov16@plt>
  subq   $0x10,-0x28(%rbp)
  addq   $0x40,-0x18(%rbp)
  addq   $0x40,-0x20(%rbp)
L91:
  mov    -0x20(%rbp),%rdx
  mov    -0x18(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <rte_mov16@plt>
  subq   $0x10,-0x28(%rbp)
  addq   $0x40,-0x18(%rbp)
  addq   $0x40,-0x20(%rbp)
L191:
  mov    -0x20(%rbp),%rdx
  mov    -0x18(%rbp),%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <rte_mov16@plt>
  subq   $0x10,-0x28(%rbp)
  addq   $0x40,-0x18(%rbp)
  addq   $0x40,-0x20(%rbp)
L47:
  cmpq   $0x0,-0x28(%rbp)
  je     L10
  mov    -0x28(%rbp),%rax
  shl    $0x2,%rax
  lea    -0x40(%rax),%rdx
  mov    -0x20(%rbp),%rax
  add    %rax,%rdx
  mov    -0x28(%rbp),%rax
  shl    $0x2,%rax
  lea    -0x40(%rax),%rcx
  mov    -0x18(%rbp),%rax
  add    %rcx,%rax
  mov    %rdx,%rsi
  mov    %rax,%rdi
  call   <rte_mov16@plt>
L10:
  mov    -0x8(%rbp),%rax
L213:
  leave
  ret
```

assistant: ```c
void *rte_memcpy_func(void *dst, const void *src, size_t n) {
  void *ret = dst;
  if (n < 16) {
    if (n & 0x01) {
      *(uint8_t *)dst = *(const uint8_t *)src;
      dst = (uint8_t *)dst + 1;
      src = (const uint8_t *)src + 1;
    }
    if (n & 0x02) {
      *(uint16_t *)dst = *(const uint16_t *)src;
      dst = (uint16_t *)dst + 1;
      src = (const uint16_t *)src + 1;
    }
    if (n & 0x04) {
      *(uint32_t *)dst = *(const uint32_t *)src;
      dst = (uint32_t *)dst + 1;
      src = (const uint32_t *)src + 1;
    }
    if (n & 0x08) {
      *(uint64_t *)dst = *(const uint64_t *)src;
    }
    return ret;
  }
  if (n <= 32) {
    rte_mov16((uint8_t *)dst, (const uint8_t *)src);
    rte_mov16((uint8_t *)dst - 16 + n, (const uint8_t *)src - 16 + n);
    return ret;
  }
  if (n <= 64) {
    rte_mov32((uint8_t *)dst, (const uint8_t *)src);
    rte_mov32((uint8_t *)dst - 32 + n, (const uint8_t *)src - 32 + n);
    return ret;
  }
  if (n <= 128) {
    rte_mov64((uint8_t *)dst, (const uint8_t *)src);
    rte_mov64((uint8_t *)dst - 64 + n, (const uint8_t *)src - 64 + n);
    return ret;
  }
  for (; n >= 256; n -= 256) {
    rte_mov256((uint8_t *)dst, (const uint8_t *)src);
    dst = (uint8_t *)dst + 256;
    src = (const uint8_t *)src + 256;
  }
  switch (3 - (n >> 6)) {
  case 0x00:
    rte_mov64((uint8_t *)dst, (const uint8_t *)src);
    n -= 64;
    dst = (uint8_t *)dst + 64;
    src = (const uint8_t *)src + 64;
  case 0x01:
    rte_mov64((uint8_t *)dst, (const uint8_t *)src);
    n -= 64;
    dst = (uint8_t *)dst + 64;
    src = (const uint8_t *)src + 64;
  case 0x02:
    rte_mov64((uint8_t *)dst, (const uint8_t *)src);
    n -= 64;
    dst = (uint8_t *)dst + 64;
    src = (const uint8_t *)src + 64;
  default:;
  }
  switch (3 - (n >> 4)) {
  case 0x00:
    rte_mov16((uint8_t *)dst, (const uint8_t *)src);
    n -= 16;
    dst = (uint8_t *)dst + 16;
    src = (const uint8_t *)src + 16;
  case 0x01:
    rte_mov16((uint8_t *)dst, (const uint8_t *)src);
    n -= 16;
    dst = (uint8_t *)dst + 16;
    src = (const uint8_t *)src + 16;
  case 0x02:
    rte_mov16((uint8_t *)dst, (const uint8_t *)src);
    n -= 16;
    dst = (uint8_t *)dst + 16;
    src = (const uint8_t *)src + 16;
  default:;
  }
  if (n != 0) {
    rte_mov16((uint8_t *)dst - 16 + n, (const uint8_t *)src - 16 + n);
  }
  return ret;
}
```