user: What is the c source code of the assembly code below?

```asm
<memcpy>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  mov    %rdi,-0x28(%rbp)
  mov    %rsi,-0x30(%rbp)
  mov    %rdx,-0x38(%rbp)
  mov    -0x28(%rbp),%rax
  mov    %rax,-0x10(%rbp)
  mov    -0x30(%rbp),%rax
  mov    %rax,-0x8(%rbp)
  jmp    L66
L153:
  mov    -0x8(%rbp),%rdx
  lea    0x1(%rdx),%rax
  mov    %rax,-0x8(%rbp)
  mov    -0x10(%rbp),%rax
  lea    0x1(%rax),%rcx
  mov    %rcx,-0x10(%rbp)
  movzbl (%rdx),%edx
  mov    %dl,(%rax)
  subq   $0x1,-0x38(%rbp)
L66:
  mov    -0x8(%rbp),%rax
  and    $0x3,%eax
  test   %rax,%rax
  je     L4
  cmpq   $0x0,-0x38(%rbp)
  jne    L153
L4:
  mov    -0x10(%rbp),%rax
  and    $0x3,%eax
  test   %rax,%rax
  jne    L159
  jmp    L108
L228:
  mov    -0x8(%rbp),%rax
  mov    (%rax),%edx
  mov    -0x10(%rbp),%rax
  mov    %edx,(%rax)
  mov    -0x8(%rbp),%rax
  add    $0x4,%rax
  mov    -0x10(%rbp),%rdx
  add    $0x4,%rdx
  mov    (%rax),%eax
  mov    %eax,(%rdx)
  mov    -0x8(%rbp),%rax
  add    $0x8,%rax
  mov    -0x10(%rbp),%rdx
  add    $0x8,%rdx
  mov    (%rax),%eax
  mov    %eax,(%rdx)
  mov    -0x8(%rbp),%rax
  add    $0xc,%rax
  mov    -0x10(%rbp),%rdx
  add    $0xc,%rdx
  mov    (%rax),%eax
  mov    %eax,(%rdx)
  addq   $0x10,-0x8(%rbp)
  addq   $0x10,-0x10(%rbp)
  subq   $0x10,-0x38(%rbp)
L108:
  cmpq   $0xf,-0x38(%rbp)
  ja     L228
  mov    -0x38(%rbp),%rax
  and    $0x8,%eax
  test   %rax,%rax
  je     L116
  mov    -0x8(%rbp),%rax
  mov    (%rax),%edx
  mov    -0x10(%rbp),%rax
  mov    %edx,(%rax)
  mov    -0x8(%rbp),%rax
  add    $0x4,%rax
  mov    -0x10(%rbp),%rdx
  add    $0x4,%rdx
  mov    (%rax),%eax
  mov    %eax,(%rdx)
  addq   $0x8,-0x10(%rbp)
  addq   $0x8,-0x8(%rbp)
L116:
  mov    -0x38(%rbp),%rax
  and    $0x4,%eax
  test   %rax,%rax
  je     L128
  mov    -0x8(%rbp),%rax
  mov    (%rax),%edx
  mov    -0x10(%rbp),%rax
  mov    %edx,(%rax)
  addq   $0x4,-0x10(%rbp)
  addq   $0x4,-0x8(%rbp)
L128:
  mov    -0x38(%rbp),%rax
  and    $0x2,%eax
  test   %rax,%rax
  je     L218
  mov    -0x8(%rbp),%rdx
  lea    0x1(%rdx),%rax
  mov    %rax,-0x8(%rbp)
  mov    -0x10(%rbp),%rax
  lea    0x1(%rax),%rcx
  mov    %rcx,-0x10(%rbp)
  movzbl (%rdx),%edx
  mov    %dl,(%rax)
  mov    -0x8(%rbp),%rdx
  lea    0x1(%rdx),%rax
  mov    %rax,-0x8(%rbp)
  mov    -0x10(%rbp),%rax
  lea    0x1(%rax),%rcx
  mov    %rcx,-0x10(%rbp)
  movzbl (%rdx),%edx
  mov    %dl,(%rax)
L218:
  mov    -0x38(%rbp),%rax
  and    $0x1,%eax
  test   %rax,%rax
  je     L80
  mov    -0x8(%rbp),%rax
  movzbl (%rax),%edx
  mov    -0x10(%rbp),%rax
  mov    %dl,(%rax)
L80:
  mov    -0x28(%rbp),%rax
  jmp    L190
L159:
  cmpq   $0x1f,-0x38(%rbp)
  jbe    L250
  mov    -0x10(%rbp),%rax
  and    $0x3,%eax
  cmp    $0x3,%rax
  je     L78
  cmp    $0x3,%rax
  ja     L250
  cmp    $0x1,%rax
  je     L64
  cmp    $0x2,%rax
  je     L276
  jmp    L250
L64:
  mov    -0x8(%rbp),%rax
  mov    (%rax),%eax
  mov    %eax,-0x18(%rbp)
  mov    -0x8(%rbp),%rdx
  lea    0x1(%rdx),%rax
  mov    %rax,-0x8(%rbp)
  mov    -0x10(%rbp),%rax
  lea    0x1(%rax),%rcx
  mov    %rcx,-0x10(%rbp)
  movzbl (%rdx),%edx
  mov    %dl,(%rax)
  mov    -0x8(%rbp),%rdx
  lea    0x1(%rdx),%rax
  mov    %rax,-0x8(%rbp)
  mov    -0x10(%rbp),%rax
  lea    0x1(%rax),%rcx
  mov    %rcx,-0x10(%rbp)
  movzbl (%rdx),%edx
  mov    %dl,(%rax)
  mov    -0x8(%rbp),%rdx
  lea    0x1(%rdx),%rax
  mov    %rax,-0x8(%rbp)
  mov    -0x10(%rbp),%rax
  lea    0x1(%rax),%rcx
  mov    %rcx,-0x10(%rbp)
  movzbl (%rdx),%edx
  mov    %dl,(%rax)
  subq   $0x3,-0x38(%rbp)
  jmp    L233
L205:
  mov    -0x8(%rbp),%rax
  add    $0x1,%rax
  mov    (%rax),%eax
  mov    %eax,-0x14(%rbp)
  mov    -0x18(%rbp),%eax
  sar    $0x18,%eax
  mov    %eax,%edx
  mov    -0x14(%rbp),%eax
  shl    $0x8,%eax
  or     %eax,%edx
  mov    -0x10(%rbp),%rax
  mov    %edx,(%rax)
  mov    -0x8(%rbp),%rax
  add    $0x5,%rax
  mov    (%rax),%eax
  mov    %eax,-0x18(%rbp)
  mov    -0x14(%rbp),%eax
  sar    $0x18,%eax
  mov    %eax,%ecx
  mov    -0x18(%rbp),%eax
  shl    $0x8,%eax
  mov    %eax,%edx
  mov    -0x10(%rbp),%rax
  add    $0x4,%rax
  or     %ecx,%edx
  mov    %edx,(%rax)
  mov    -0x8(%rbp),%rax
  add    $0x9,%rax
  mov    (%rax),%eax
  mov    %eax,-0x14(%rbp)
  mov    -0x18(%rbp),%eax
  sar    $0x18,%eax
  mov    %eax,%ecx
  mov    -0x14(%rbp),%eax
  shl    $0x8,%eax
  mov    %eax,%edx
  mov    -0x10(%rbp),%rax
  add    $0x8,%rax
  or     %ecx,%edx
  mov    %edx,(%rax)
  mov    -0x8(%rbp),%rax
  add    $0xd,%rax
  mov    (%rax),%eax
  mov    %eax,-0x18(%rbp)
  mov    -0x14(%rbp),%eax
  sar    $0x18,%eax
  mov    %eax,%ecx
  mov    -0x18(%rbp),%eax
  shl    $0x8,%eax
  mov    %eax,%edx
  mov    -0x10(%rbp),%rax
  add    $0xc,%rax
  or     %ecx,%edx
  mov    %edx,(%rax)
  addq   $0x10,-0x8(%rbp)
  addq   $0x10,-0x10(%rbp)
  subq   $0x10,-0x38(%rbp)
L233:
  cmpq   $0x10,-0x38(%rbp)
  ja     L205
  jmp    L250
L276:
  mov    -0x8(%rbp),%rax
  mov    (%rax),%eax
  mov    %eax,-0x18(%rbp)
  mov    -0x8(%rbp),%rdx
  lea    0x1(%rdx),%rax
  mov    %rax,-0x8(%rbp)
  mov    -0x10(%rbp),%rax
  lea    0x1(%rax),%rcx
  mov    %rcx,-0x10(%rbp)
  movzbl (%rdx),%edx
  mov    %dl,(%rax)
  mov    -0x8(%rbp),%rdx
  lea    0x1(%rdx),%rax
  mov    %rax,-0x8(%rbp)
  mov    -0x10(%rbp),%rax
  lea    0x1(%rax),%rcx
  mov    %rcx,-0x10(%rbp)
  movzbl (%rdx),%edx
  mov    %dl,(%rax)
  subq   $0x2,-0x38(%rbp)
  jmp    L277
L227:
  mov    -0x8(%rbp),%rax
  add    $0x2,%rax
  mov    (%rax),%eax
  mov    %eax,-0x14(%rbp)
  mov    -0x18(%rbp),%eax
  sar    $0x10,%eax
  mov    %eax,%edx
  mov    -0x14(%rbp),%eax
  shl    $0x10,%eax
  or     %eax,%edx
  mov    -0x10(%rbp),%rax
  mov    %edx,(%rax)
  mov    -0x8(%rbp),%rax
  add    $0x6,%rax
  mov    (%rax),%eax
  mov    %eax,-0x18(%rbp)
  mov    -0x14(%rbp),%eax
  sar    $0x10,%eax
  mov    %eax,%ecx
  mov    -0x18(%rbp),%eax
  shl    $0x10,%eax
  mov    %eax,%edx
  mov    -0x10(%rbp),%rax
  add    $0x4,%rax
  or     %ecx,%edx
  mov    %edx,(%rax)
  mov    -0x8(%rbp),%rax
  add    $0xa,%rax
  mov    (%rax),%eax
  mov    %eax,-0x14(%rbp)
  mov    -0x18(%rbp),%eax
  sar    $0x10,%eax
  mov    %eax,%ecx
  mov    -0x14(%rbp),%eax
  shl    $0x10,%eax
  mov    %eax,%edx
  mov    -0x10(%rbp),%rax
  add    $0x8,%rax
  or     %ecx,%edx
  mov    %edx,(%rax)
  mov    -0x8(%rbp),%rax
  add    $0xe,%rax
  mov    (%rax),%eax
  mov    %eax,-0x18(%rbp)
  mov    -0x14(%rbp),%eax
  sar    $0x10,%eax
  mov    %eax,%ecx
  mov    -0x18(%rbp),%eax
  shl    $0x10,%eax
  mov    %eax,%edx
  mov    -0x10(%rbp),%rax
  add    $0xc,%rax
  or     %ecx,%edx
  mov    %edx,(%rax)
  addq   $0x10,-0x8(%rbp)
  addq   $0x10,-0x10(%rbp)
  subq   $0x10,-0x38(%rbp)
L277:
  cmpq   $0x11,-0x38(%rbp)
  ja     L227
  jmp    L250
L78:
  mov    -0x8(%rbp),%rax
  mov    (%rax),%eax
  mov    %eax,-0x18(%rbp)
  mov    -0x8(%rbp),%rdx
  lea    0x1(%rdx),%rax
  mov    %rax,-0x8(%rbp)
  mov    -0x10(%rbp),%rax
  lea    0x1(%rax),%rcx
  mov    %rcx,-0x10(%rbp)
  movzbl (%rdx),%edx
  mov    %dl,(%rax)
  subq   $0x1,-0x38(%rbp)
  jmp    L181
L20:
  mov    -0x8(%rbp),%rax
  add    $0x3,%rax
  mov    (%rax),%eax
  mov    %eax,-0x14(%rbp)
  mov    -0x18(%rbp),%eax
  sar    $0x8,%eax
  mov    %eax,%edx
  mov    -0x14(%rbp),%eax
  shl    $0x18,%eax
  or     %eax,%edx
  mov    -0x10(%rbp),%rax
  mov    %edx,(%rax)
  mov    -0x8(%rbp),%rax
  add    $0x7,%rax
  mov    (%rax),%eax
  mov    %eax,-0x18(%rbp)
  mov    -0x14(%rbp),%eax
  sar    $0x8,%eax
  mov    %eax,%ecx
  mov    -0x18(%rbp),%eax
  shl    $0x18,%eax
  mov    %eax,%edx
  mov    -0x10(%rbp),%rax
  add    $0x4,%rax
  or     %ecx,%edx
  mov    %edx,(%rax)
  mov    -0x8(%rbp),%rax
  add    $0xb,%rax
  mov    (%rax),%eax
  mov    %eax,-0x14(%rbp)
  mov    -0x18(%rbp),%eax
  sar    $0x8,%eax
  mov    %eax,%ecx
  mov    -0x14(%rbp),%eax
  shl    $0x18,%eax
  mov    %eax,%edx
  mov    -0x10(%rbp),%rax
  add    $0x8,%rax
  or     %ecx,%edx
  mov    %edx,(%rax)
  mov    -0x8(%rbp),%rax
  add    $0xf,%rax
  mov    (%rax),%eax
  mov    %eax,-0x18(%rbp)
  mov    -0x14(%rbp),%eax
  sar    $0x8,%eax
  mov    %eax,%ecx
  mov    -0x18(%rbp),%eax
  shl    $0x18,%eax
  mov    %eax,%edx
  mov    -0x10(%rbp),%rax
  add    $0xc,%rax
  or     %ecx,%edx
  mov    %edx,(%rax)
  addq   $0x10,-0x8(%rbp)
  addq   $0x10,-0x10(%rbp)
  subq   $0x10,-0x38(%rbp)
L181:
  cmpq   $0x12,-0x38(%rbp)
  ja     L20
  nop
L250:
  mov    -0x38(%rbp),%rax
  and    $0x10,%eax
  test   %rax,%rax
  je     L207
  mov    -0x8(%rbp),%rdx
  lea    0x1(%rdx),%rax
  mov    %rax,-0x8(%rbp)
  mov    -0x10(%rbp),%rax
  lea    0x1(%rax),%rcx
  mov    %rcx,-0x10(%rbp)
  movzbl (%rdx),%edx
  mov    %dl,(%rax)
  mov    -0x8(%rbp),%rdx
  lea    0x1(%rdx),%rax
  mov    %rax,-0x8(%rbp)
  mov    -0x10(%rbp),%rax
  lea    0x1(%rax),%rcx
  mov    %rcx,-0x10(%rbp)
  movzbl (%rdx),%edx
  mov    %dl,(%rax)
  mov    -0x8(%rbp),%rdx
  lea    0x1(%rdx),%rax
  mov    %rax,-0x8(%rbp)
  mov    -0x10(%rbp),%rax
  lea    0x1(%rax),%rcx
  mov    %rcx,-0x10(%rbp)
  movzbl (%rdx),%edx
  mov    %dl,(%rax)
  mov    -0x8(%rbp),%rdx
  lea    0x1(%rdx),%rax
  mov    %rax,-0x8(%rbp)
  mov    -0x10(%rbp),%rax
  lea    0x1(%rax),%rcx
  mov    %rcx,-0x10(%rbp)
  movzbl (%rdx),%edx
  mov    %dl,(%rax)
  mov    -0x8(%rbp),%rdx
  lea    0x1(%rdx),%rax
  mov    %rax,-0x8(%rbp)
  mov    -0x10(%rbp),%rax
  lea    0x1(%rax),%rcx
  mov    %rcx,-0x10(%rbp)
  movzbl (%rdx),%edx
  mov    %dl,(%rax)
  mov    -0x8(%rbp),%rdx
  lea    0x1(%rdx),%rax
  mov    %rax,-0x8(%rbp)
  mov    -0x10(%rbp),%rax
  lea    0x1(%rax),%rcx
  mov    %rcx,-0x10(%rbp)
  movzbl (%rdx),%edx
  mov    %dl,(%rax)
  mov    -0x8(%rbp),%rdx
  lea    0x1(%rdx),%rax
  mov    %rax,-0x8(%rbp)
  mov    -0x10(%rbp),%rax
  lea    0x1(%rax),%rcx
  mov    %rcx,-0x10(%rbp)
  movzbl (%rdx),%edx
  mov    %dl,(%rax)
  mov    -0x8(%rbp),%rdx
  lea    0x1(%rdx),%rax
  mov    %rax,-0x8(%rbp)
  mov    -0x10(%rbp),%rax
  lea    0x1(%rax),%rcx
  mov    %rcx,-0x10(%rbp)
  movzbl (%rdx),%edx
  mov    %dl,(%rax)
  mov    -0x8(%rbp),%rdx
  lea    0x1(%rdx),%rax
  mov    %rax,-0x8(%rbp)
  mov    -0x10(%rbp),%rax
  lea    0x1(%rax),%rcx
  mov    %rcx,-0x10(%rbp)
  movzbl (%rdx),%edx
  mov    %dl,(%rax)
  mov    -0x8(%rbp),%rdx
  lea    0x1(%rdx),%rax
  mov    %rax,-0x8(%rbp)
  mov    -0x10(%rbp),%rax
  lea    0x1(%rax),%rcx
  mov    %rcx,-0x10(%rbp)
  movzbl (%rdx),%edx
  mov    %dl,(%rax)
  mov    -0x8(%rbp),%rdx
  lea    0x1(%rdx),%rax
  mov    %rax,-0x8(%rbp)
  mov    -0x10(%rbp),%rax
  lea    0x1(%rax),%rcx
  mov    %rcx,-0x10(%rbp)
  movzbl (%rdx),%edx
  mov    %dl,(%rax)
  mov    -0x8(%rbp),%rdx
  lea    0x1(%rdx),%rax
  mov    %rax,-0x8(%rbp)
  mov    -0x10(%rbp),%rax
  lea    0x1(%rax),%rcx
  mov    %rcx,-0x10(%rbp)
  movzbl (%rdx),%edx
  mov    %dl,(%rax)
  mov    -0x8(%rbp),%rdx
  lea    0x1(%rdx),%rax
  mov    %rax,-0x8(%rbp)
  mov    -0x10(%rbp),%rax
  lea    0x1(%rax),%rcx
  mov    %rcx,-0x10(%rbp)
  movzbl (%rdx),%edx
  mov    %dl,(%rax)
  mov    -0x8(%rbp),%rdx
  lea    0x1(%rdx),%rax
  mov    %rax,-0x8(%rbp)
  mov    -0x10(%rbp),%rax
  lea    0x1(%rax),%rcx
  mov    %rcx,-0x10(%rbp)
  movzbl (%rdx),%edx
  mov    %dl,(%rax)
  mov    -0x8(%rbp),%rdx
  lea    0x1(%rdx),%rax
  mov    %rax,-0x8(%rbp)
  mov    -0x10(%rbp),%rax
  lea    0x1(%rax),%rcx
  mov    %rcx,-0x10(%rbp)
  movzbl (%rdx),%edx
  mov    %dl,(%rax)
  mov    -0x8(%rbp),%rdx
  lea    0x1(%rdx),%rax
  mov    %rax,-0x8(%rbp)
  mov    -0x10(%rbp),%rax
  lea    0x1(%rax),%rcx
  mov    %rcx,-0x10(%rbp)
  movzbl (%rdx),%edx
  mov    %dl,(%rax)
L207:
  mov    -0x38(%rbp),%rax
  and    $0x8,%eax
  test   %rax,%rax
  je     L164
  mov    -0x8(%rbp),%rdx
  lea    0x1(%rdx),%rax
  mov    %rax,-0x8(%rbp)
  mov    -0x10(%rbp),%rax
  lea    0x1(%rax),%rcx
  mov    %rcx,-0x10(%rbp)
  movzbl (%rdx),%edx
  mov    %dl,(%rax)
  mov    -0x8(%rbp),%rdx
  lea    0x1(%rdx),%rax
  mov    %rax,-0x8(%rbp)
  mov    -0x10(%rbp),%rax
  lea    0x1(%rax),%rcx
  mov    %rcx,-0x10(%rbp)
  movzbl (%rdx),%edx
  mov    %dl,(%rax)
  mov    -0x8(%rbp),%rdx
  lea    0x1(%rdx),%rax
  mov    %rax,-0x8(%rbp)
  mov    -0x10(%rbp),%rax
  lea    0x1(%rax),%rcx
  mov    %rcx,-0x10(%rbp)
  movzbl (%rdx),%edx
  mov    %dl,(%rax)
  mov    -0x8(%rbp),%rdx
  lea    0x1(%rdx),%rax
  mov    %rax,-0x8(%rbp)
  mov    -0x10(%rbp),%rax
  lea    0x1(%rax),%rcx
  mov    %rcx,-0x10(%rbp)
  movzbl (%rdx),%edx
  mov    %dl,(%rax)
  mov    -0x8(%rbp),%rdx
  lea    0x1(%rdx),%rax
  mov    %rax,-0x8(%rbp)
  mov    -0x10(%rbp),%rax
  lea    0x1(%rax),%rcx
  mov    %rcx,-0x10(%rbp)
  movzbl (%rdx),%edx
  mov    %dl,(%rax)
  mov    -0x8(%rbp),%rdx
  lea    0x1(%rdx),%rax
  mov    %rax,-0x8(%rbp)
  mov    -0x10(%rbp),%rax
  lea    0x1(%rax),%rcx
  mov    %rcx,-0x10(%rbp)
  movzbl (%rdx),%edx
  mov    %dl,(%rax)
  mov    -0x8(%rbp),%rdx
  lea    0x1(%rdx),%rax
  mov    %rax,-0x8(%rbp)
  mov    -0x10(%rbp),%rax
  lea    0x1(%rax),%rcx
  mov    %rcx,-0x10(%rbp)
  movzbl (%rdx),%edx
  mov    %dl,(%rax)
  mov    -0x8(%rbp),%rdx
  lea    0x1(%rdx),%rax
  mov    %rax,-0x8(%rbp)
  mov    -0x10(%rbp),%rax
  lea    0x1(%rax),%rcx
  mov    %rcx,-0x10(%rbp)
  movzbl (%rdx),%edx
  mov    %dl,(%rax)
L164:
  mov    -0x38(%rbp),%rax
  and    $0x4,%eax
  test   %rax,%rax
  je     L118
  mov    -0x8(%rbp),%rdx
  lea    0x1(%rdx),%rax
  mov    %rax,-0x8(%rbp)
  mov    -0x10(%rbp),%rax
  lea    0x1(%rax),%rcx
  mov    %rcx,-0x10(%rbp)
  movzbl (%rdx),%edx
  mov    %dl,(%rax)
  mov    -0x8(%rbp),%rdx
  lea    0x1(%rdx),%rax
  mov    %rax,-0x8(%rbp)
  mov    -0x10(%rbp),%rax
  lea    0x1(%rax),%rcx
  mov    %rcx,-0x10(%rbp)
  movzbl (%rdx),%edx
  mov    %dl,(%rax)
  mov    -0x8(%rbp),%rdx
  lea    0x1(%rdx),%rax
  mov    %rax,-0x8(%rbp)
  mov    -0x10(%rbp),%rax
  lea    0x1(%rax),%rcx
  mov    %rcx,-0x10(%rbp)
  movzbl (%rdx),%edx
  mov    %dl,(%rax)
  mov    -0x8(%rbp),%rdx
  lea    0x1(%rdx),%rax
  mov    %rax,-0x8(%rbp)
  mov    -0x10(%rbp),%rax
  lea    0x1(%rax),%rcx
  mov    %rcx,-0x10(%rbp)
  movzbl (%rdx),%edx
  mov    %dl,(%rax)
L118:
  mov    -0x38(%rbp),%rax
  and    $0x2,%eax
  test   %rax,%rax
  je     L136
  mov    -0x8(%rbp),%rdx
  lea    0x1(%rdx),%rax
  mov    %rax,-0x8(%rbp)
  mov    -0x10(%rbp),%rax
  lea    0x1(%rax),%rcx
  mov    %rcx,-0x10(%rbp)
  movzbl (%rdx),%edx
  mov    %dl,(%rax)
  mov    -0x8(%rbp),%rdx
  lea    0x1(%rdx),%rax
  mov    %rax,-0x8(%rbp)
  mov    -0x10(%rbp),%rax
  lea    0x1(%rax),%rcx
  mov    %rcx,-0x10(%rbp)
  movzbl (%rdx),%edx
  mov    %dl,(%rax)
L136:
  mov    -0x38(%rbp),%rax
  and    $0x1,%eax
  test   %rax,%rax
  je     L184
  mov    -0x8(%rbp),%rax
  movzbl (%rax),%edx
  mov    -0x10(%rbp),%rax
  mov    %dl,(%rax)
L184:
  mov    -0x28(%rbp),%rax
L190:
  pop    %rbp
  ret
```

assistant: ```c
void *memcpy(void *restrict dest, const void *restrict src, size_t n) {
  unsigned char *d = dest;
  const unsigned char *s = src;
  typedef uint32_t __attribute__((__may_alias__)) u32;
  uint32_t w, x;
  for (; (uintptr_t)s % 4 && n; n--)
    *d++ = *s++;
  if ((uintptr_t)d % 4 == 0) {
    for (; n >= 16; s += 16, d += 16, n -= 16) {
      *(u32 *)(d + 0) = *(u32 *)(s + 0);
      *(u32 *)(d + 4) = *(u32 *)(s + 4);
      *(u32 *)(d + 8) = *(u32 *)(s + 8);
      *(u32 *)(d + 12) = *(u32 *)(s + 12);
    }
    if (n & 8) {
      *(u32 *)(d + 0) = *(u32 *)(s + 0);
      *(u32 *)(d + 4) = *(u32 *)(s + 4);
      d += 8;
      s += 8;
    }
    if (n & 4) {
      *(u32 *)(d + 0) = *(u32 *)(s + 0);
      d += 4;
      s += 4;
    }
    if (n & 2) {
      *d++ = *s++;
      *d++ = *s++;
    }
    if (n & 1) {
      *d = *s;
    }
    return dest;
  }
  if (n >= 32)
    switch ((uintptr_t)d % 4) {
    case 1:
      w = *(u32 *)s;
      *d++ = *s++;
      *d++ = *s++;
      *d++ = *s++;
      n -= 3;
      for (; n >= 17; s += 16, d += 16, n -= 16) {
        x = *(u32 *)(s + 1);
        *(u32 *)(d + 0) = (w >> 24) | (x << 8);
        w = *(u32 *)(s + 5);
        *(u32 *)(d + 4) = (x >> 24) | (w << 8);
        x = *(u32 *)(s + 9);
        *(u32 *)(d + 8) = (w >> 24) | (x << 8);
        w = *(u32 *)(s + 13);
        *(u32 *)(d + 12) = (x >> 24) | (w << 8);
      }
      break;
    case 2:
      w = *(u32 *)s;
      *d++ = *s++;
      *d++ = *s++;
      n -= 2;
      for (; n >= 18; s += 16, d += 16, n -= 16) {
        x = *(u32 *)(s + 2);
        *(u32 *)(d + 0) = (w >> 16) | (x << 16);
        w = *(u32 *)(s + 6);
        *(u32 *)(d + 4) = (x >> 16) | (w << 16);
        x = *(u32 *)(s + 10);
        *(u32 *)(d + 8) = (w >> 16) | (x << 16);
        w = *(u32 *)(s + 14);
        *(u32 *)(d + 12) = (x >> 16) | (w << 16);
      }
      break;
    case 3:
      w = *(u32 *)s;
      *d++ = *s++;
      n -= 1;
      for (; n >= 19; s += 16, d += 16, n -= 16) {
        x = *(u32 *)(s + 3);
        *(u32 *)(d + 0) = (w >> 8) | (x << 24);
        w = *(u32 *)(s + 7);
        *(u32 *)(d + 4) = (x >> 8) | (w << 24);
        x = *(u32 *)(s + 11);
        *(u32 *)(d + 8) = (w >> 8) | (x << 24);
        w = *(u32 *)(s + 15);
        *(u32 *)(d + 12) = (x >> 8) | (w << 24);
      }
      break;
    }
  if (n & 16) {
    *d++ = *s++;
    *d++ = *s++;
    *d++ = *s++;
    *d++ = *s++;
    *d++ = *s++;
    *d++ = *s++;
    *d++ = *s++;
    *d++ = *s++;
    *d++ = *s++;
    *d++ = *s++;
    *d++ = *s++;
    *d++ = *s++;
    *d++ = *s++;
    *d++ = *s++;
    *d++ = *s++;
    *d++ = *s++;
  }
  if (n & 8) {
    *d++ = *s++;
    *d++ = *s++;
    *d++ = *s++;
    *d++ = *s++;
    *d++ = *s++;
    *d++ = *s++;
    *d++ = *s++;
    *d++ = *s++;
  }
  if (n & 4) {
    *d++ = *s++;
    *d++ = *s++;
    *d++ = *s++;
    *d++ = *s++;
  }
  if (n & 2) {
    *d++ = *s++;
    *d++ = *s++;
  }
  if (n & 1) {
    *d = *s;
  }
  return dest;
}
```