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

```asm
<memcpy>:
  endbr64
  mov    %rdi,%r8
  mov    %rsi,%rcx
  cmp    %rsi,%rdi
  je     L167
  mov    %edi,%eax
  or     %esi,%eax
  mov    %rdi,%rsi
  test   $0x7,%al
  je     L247
L88:
  lea    -0x1(%rdx),%rdi
  test   %rdx,%rdx
  je     L167
  lea    0x1(%rcx),%r9
  mov    %rsi,%rax
  sub    %r9,%rax
  cmp    $0xe,%rax
  jbe    L72
  cmp    $0x6,%rdi
  jbe    L72
  cmp    $0xe,%rdi
  jbe    L194
  mov    %rdx,%r9
  xor    %eax,%eax
  and    $0xfffffffffffffff0,%r9
L151:
  movdqu (%rcx,%rax,1),%xmm0
  movups %xmm0,(%rsi,%rax,1)
  add    $0x10,%rax
  cmp    %rax,%r9
  jne    L151
  mov    %rdx,%rax
  and    $0xfffffffffffffff0,%rax
  lea    (%rsi,%rax,1),%r9
  lea    (%rcx,%rax,1),%r10
  sub    %rax,%rdi
  cmp    %rax,%rdx
  je     L167
  sub    %rax,%rdx
  lea    -0x1(%rdx),%r11
  cmp    $0x6,%r11
  jbe    L19
L125:
  mov    (%rcx,%rax,1),%rcx
  mov    %rcx,(%rsi,%rax,1)
  mov    %rdx,%rax
  and    $0xfffffffffffffff8,%rax
  add    %rax,%r9
  add    %rax,%r10
  sub    %rax,%rdi
  cmp    %rax,%rdx
  je     L167
L19:
  movzbl (%r10),%eax
  mov    %al,(%r9)
  test   %rdi,%rdi
  je     L167
  movzbl 0x1(%r10),%eax
  mov    %al,0x1(%r9)
  cmp    $0x1,%rdi
  je     L167
  movzbl 0x2(%r10),%eax
  mov    %al,0x2(%r9)
  cmp    $0x2,%rdi
  je     L167
  movzbl 0x3(%r10),%eax
  mov    %al,0x3(%r9)
  cmp    $0x3,%rdi
  je     L167
  movzbl 0x4(%r10),%eax
  mov    %al,0x4(%r9)
  cmp    $0x4,%rdi
  je     L167
  movzbl 0x5(%r10),%eax
  mov    %al,0x5(%r9)
  cmp    $0x5,%rdi
  je     L167
  movzbl 0x6(%r10),%eax
  mov    %al,0x6(%r9)
L167:
  mov    %r8,%rax
  ret
  nopl   0x0(%rax,%rax,1)
L247:
  cmp    $0x7,%rdx
  jbe    L88
  lea    0x8(%rcx),%rax
  lea    -0x8(%rdx),%rdi
  cmp    %rax,%r8
  je     L197
  cmp    $0x17,%rdi
  jbe    L197
  mov    %rdi,%r9
  xor    %eax,%eax
  shr    $0x3,%r9
  add    $0x1,%r9
  mov    %r9,%rsi
  shr    %rsi
  shl    $0x4,%rsi
  nopl   0x0(%rax)
L176:
  movdqu (%rcx,%rax,1),%xmm1
  movups %xmm1,(%r8,%rax,1)
  add    $0x10,%rax
  cmp    %rsi,%rax
  jne    L176
  mov    %r9,%r10
  and    $0xfffffffffffffffe,%r10
  lea    0x0(,%r10,8),%rax
  lea    (%r8,%rax,1),%rsi
  add    %rcx,%rax
  cmp    %r10,%r9
  je     L57
  mov    (%rax),%rax
  mov    %rax,(%rsi)
L57:
  shr    $0x3,%rdi
  and    $0x7,%edx
  lea    0x8(,%rdi,8),%rax
  lea    (%r8,%rax,1),%rsi
  add    %rax,%rcx
  jmp    L88
  nop
L72:
  xor    %eax,%eax
  nopw   0x0(%rax,%rax,1)
L129:
  movzbl (%rcx,%rax,1),%edi
  mov    %dil,(%rsi,%rax,1)
  add    $0x1,%rax
  cmp    %rax,%rdx
  jne    L129
  mov    %r8,%rax
  ret
L197:
  mov    %rdi,%rax
  shr    $0x3,%rax
  lea    0x8(,%rax,8),%r9
  xor    %eax,%eax
  xchg   %ax,%ax
L106:
  mov    (%rcx,%rax,1),%rsi
  mov    %rsi,(%r8,%rax,1)
  add    $0x8,%rax
  cmp    %rax,%r9
  jne    L106
  jmp    L57
L194:
  mov    %rcx,%r10
  mov    %rsi,%r9
  xor    %eax,%eax
  jmp    L125
```

assistant: ```c
void *memcpy(void *dest, const void *src, size_t count) {
  unsigned long *dl = (unsigned long *)dest, *sl = (unsigned long *)src;
  char *d8, *s8;
  if (src == dest)
    return dest;
  if ((((uint32_t)dest | (uint32_t)src) & (sizeof(*dl) - 1)) == 0) {
    while (count >= sizeof(*dl)) {
      *dl++ = *sl++;
      count -= sizeof(*dl);
    }
  }
  d8 = (char *)dl;
  s8 = (char *)sl;
  while (count--) {
    *d8++ = *s8++;
  }
  return dest;
}
```