user: 请从给定的汇编指令推导出C源代码：

```asm
<merge>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  sub    $0x60,%rsp
  mov    %rdi,-0x68(%rbp)
  mov    %esi,-0x6c(%rbp)
  mov    %edx,-0x70(%rbp)
  mov    %ecx,-0x74(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x28(%rbp)
  xor    %eax,%eax
  mov    %rsp,%rax
  mov    %rax,%rsi
  mov    -0x70(%rbp),%eax
  sub    -0x6c(%rbp),%eax
  add    $0x1,%eax
  mov    %eax,-0x50(%rbp)
  mov    -0x74(%rbp),%eax
  sub    -0x70(%rbp),%eax
  mov    %eax,-0x4c(%rbp)
  movl   $0x0,-0x5c(%rbp)
  movl   $0x0,-0x58(%rbp)
  movl   $0x0,-0x54(%rbp)
  mov    -0x50(%rbp),%eax
  movslq %eax,%rdx
  sub    $0x1,%rdx
  mov    %rdx,-0x48(%rbp)
  movslq %eax,%rdx
  mov    %rdx,%r14
  mov    $0x0,%r15d
  movslq %eax,%rdx
  mov    %rdx,%r12
  mov    $0x0,%r13d
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    $0x10,%eax
  sub    $0x1,%rax
  add    %rdx,%rax
  mov    $0x10,%edi
  mov    $0x0,%edx
  div    %rdi
  imul   $0x10,%rax,%rax
  mov    %rax,%rcx
  and    $0xfffffffffffff000,%rcx
  mov    %rsp,%rdx
  sub    %rcx,%rdx
L175:
  cmp    %rdx,%rsp
  je     L32
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  jmp    L175
L32:
  mov    %rax,%rdx
  and    $0xfff,%edx
  sub    %rdx,%rsp
  mov    %rax,%rdx
  and    $0xfff,%edx
  test   %rdx,%rdx
  je     L156
  and    $0xfff,%eax
  sub    $0x8,%rax
  add    %rsp,%rax
  orq    $0x0,(%rax)
L156:
  mov    %rsp,%rax
  add    $0x3,%rax
  shr    $0x2,%rax
  shl    $0x2,%rax
  mov    %rax,-0x40(%rbp)
  mov    -0x4c(%rbp),%eax
  movslq %eax,%rdx
  sub    $0x1,%rdx
  mov    %rdx,-0x38(%rbp)
  movslq %eax,%rdx
  mov    %rdx,%r10
  mov    $0x0,%r11d
  movslq %eax,%rdx
  mov    %rdx,%r8
  mov    $0x0,%r9d
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    $0x10,%eax
  sub    $0x1,%rax
  add    %rdx,%rax
  mov    $0x10,%edi
  mov    $0x0,%edx
  div    %rdi
  imul   $0x10,%rax,%rax
  mov    %rax,%rcx
  and    $0xfffffffffffff000,%rcx
  mov    %rsp,%rdx
  sub    %rcx,%rdx
L12:
  cmp    %rdx,%rsp
  je     L109
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  jmp    L12
L109:
  mov    %rax,%rdx
  and    $0xfff,%edx
  sub    %rdx,%rsp
  mov    %rax,%rdx
  and    $0xfff,%edx
  test   %rdx,%rdx
  je     L112
  and    $0xfff,%eax
  sub    $0x8,%rax
  add    %rsp,%rax
  orq    $0x0,(%rax)
L112:
  mov    %rsp,%rax
  add    $0x3,%rax
  shr    $0x2,%rax
  shl    $0x2,%rax
  mov    %rax,-0x30(%rbp)
  movl   $0x0,-0x5c(%rbp)
  jmp    L137
L29:
  mov    -0x6c(%rbp),%edx
  mov    -0x5c(%rbp),%eax
  add    %edx,%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x68(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%ecx
  mov    -0x40(%rbp),%rax
  mov    -0x5c(%rbp),%edx
  movslq %edx,%rdx
  mov    %ecx,(%rax,%rdx,4)
  addl   $0x1,-0x5c(%rbp)
L137:
  mov    -0x5c(%rbp),%eax
  cmp    -0x50(%rbp),%eax
  jl     L29
  movl   $0x0,-0x5c(%rbp)
  jmp    L100
L171:
  mov    -0x70(%rbp),%eax
  lea    0x1(%rax),%edx
  mov    -0x5c(%rbp),%eax
  add    %edx,%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x68(%rbp),%rax
  add    %rdx,%rax
  mov    (%rax),%ecx
  mov    -0x30(%rbp),%rax
  mov    -0x5c(%rbp),%edx
  movslq %edx,%rdx
  mov    %ecx,(%rax,%rdx,4)
  addl   $0x1,-0x5c(%rbp)
L100:
  mov    -0x5c(%rbp),%eax
  cmp    -0x4c(%rbp),%eax
  jl     L171
  movl   $0x0,-0x5c(%rbp)
  movl   $0x0,-0x58(%rbp)
  movl   $0x0,-0x54(%rbp)
  jmp    L57
L55:
  mov    -0x40(%rbp),%rax
  mov    -0x5c(%rbp),%edx
  movslq %edx,%rdx
  mov    (%rax,%rdx,4),%ecx
  mov    -0x30(%rbp),%rax
  mov    -0x58(%rbp),%edx
  movslq %edx,%rdx
  mov    (%rax,%rdx,4),%eax
  cmp    %eax,%ecx
  jg     L127
  mov    -0x5c(%rbp),%eax
  lea    0x1(%rax),%edx
  mov    %edx,-0x5c(%rbp)
  mov    -0x54(%rbp),%edx
  lea    0x1(%rdx),%ecx
  mov    %ecx,-0x54(%rbp)
  movslq %edx,%rdx
  lea    0x0(,%rdx,4),%rcx
  mov    -0x68(%rbp),%rdx
  add    %rdx,%rcx
  mov    -0x40(%rbp),%rdx
  cltq
  mov    (%rdx,%rax,4),%eax
  mov    %eax,(%rcx)
  jmp    L57
L127:
  mov    -0x58(%rbp),%eax
  lea    0x1(%rax),%edx
  mov    %edx,-0x58(%rbp)
  mov    -0x54(%rbp),%edx
  lea    0x1(%rdx),%ecx
  mov    %ecx,-0x54(%rbp)
  movslq %edx,%rdx
  lea    0x0(,%rdx,4),%rcx
  mov    -0x68(%rbp),%rdx
  add    %rdx,%rcx
  mov    -0x30(%rbp),%rdx
  cltq
  mov    (%rdx,%rax,4),%eax
  mov    %eax,(%rcx)
L57:
  mov    -0x5c(%rbp),%eax
  cmp    -0x50(%rbp),%eax
  jge    L101
  mov    -0x58(%rbp),%eax
  cmp    -0x4c(%rbp),%eax
  jl     L55
  jmp    L101
L151:
  mov    -0x5c(%rbp),%eax
  lea    0x1(%rax),%edx
  mov    %edx,-0x5c(%rbp)
  mov    -0x54(%rbp),%edx
  lea    0x1(%rdx),%ecx
  mov    %ecx,-0x54(%rbp)
  movslq %edx,%rdx
  lea    0x0(,%rdx,4),%rcx
  mov    -0x68(%rbp),%rdx
  add    %rdx,%rcx
  mov    -0x40(%rbp),%rdx
  cltq
  mov    (%rdx,%rax,4),%eax
  mov    %eax,(%rcx)
L101:
  mov    -0x5c(%rbp),%eax
  cmp    -0x50(%rbp),%eax
  jl     L151
  jmp    L21
L120:
  mov    -0x58(%rbp),%eax
  lea    0x1(%rax),%edx
  mov    %edx,-0x58(%rbp)
  mov    -0x54(%rbp),%edx
  lea    0x1(%rdx),%ecx
  mov    %ecx,-0x54(%rbp)
  movslq %edx,%rdx
  lea    0x0(,%rdx,4),%rcx
  mov    -0x68(%rbp),%rdx
  add    %rdx,%rcx
  mov    -0x30(%rbp),%rdx
  cltq
  mov    (%rdx,%rax,4),%eax
  mov    %eax,(%rcx)
L21:
  mov    -0x58(%rbp),%eax
  cmp    -0x4c(%rbp),%eax
  jl     L120
  mov    %rsi,%rsp
  nop
  mov    -0x28(%rbp),%rax
  sub    %fs:0x28,%rax
  je     L61
  call   <__stack_chk_fail@plt>
L61:
  lea    -0x20(%rbp),%rsp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  pop    %rbp
  ret
```

assistant: ```c
void merge(int a[], int l, int m, int r) {
  int l1 = m - l + 1;
  int l2 = r - m;
  int i = 0, j = 0, k = 0;
  int a1[l1], a2[l2];
  for (i = 0; i < l1; i++)
    a1[i] = a[l + i];
  for (i = 0; i < l2; i++)
    a2[i] = a[m + 1 + i];
  i = 0;
  j = 0;
  k = 0;
  while ((i < l1) && (j < l2)) {
    if (a1[i] <= a2[j])
      a[k++] = a1[i++];
    else
      a[k++] = a2[j++];
  }
  while (i < l1)
    a[k++] = a1[i++];
  while (j < l2)
    a[k++] = a2[j++];
}
```