user: What would the C source look like for the assembly code provided here:

```asm
<merge>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x28,%rsp
  mov    %edi,(%rsp)
  mov    %edx,0x4(%rsp)
  cmp    %edx,%ecx
  jle    L156
  lea    (%rcx,%rdx,1),%eax
  mov    %rsi,%rbp
  mov    %ecx,%r13d
  mov    %r8,%r12
  mov    %eax,%r14d
  shr    $0x1f,%r14d
  add    %eax,%r14d
  sar    %r14d
  cmp    %edx,%r14d
  jle    L89
  lea    (%rdx,%r14,1),%eax
  mov    %eax,%r15d
  shr    $0x1f,%r15d
  add    %eax,%r15d
  sar    %r15d
  cmp    %edx,%r15d
  jle    L113
  lea    (%rdx,%r15,1),%eax
  mov    %eax,%ebx
  shr    $0x1f,%ebx
  add    %eax,%ebx
  sar    %ebx
  cmp    %edx,%ebx
  jle    L61
  lea    (%rdx,%rbx,1),%eax
  mov    %eax,%r9d
  shr    $0x1f,%r9d
  add    %eax,%r9d
  sar    %r9d
  cmp    %edx,%r9d
  jle    L30
  lea    (%rdx,%r9,1),%eax
  mov    %r9d,0x10(%rsp)
  mov    %eax,%r10d
  shr    $0x1f,%r10d
  add    %eax,%r10d
  sar    %r10d
  mov    %r10d,%ecx
  mov    %r10d,0x8(%rsp)
  call   <merge>
  mov    0x8(%rsp),%r10d
  mov    (%rsp),%edi
  mov    %r12,%r8
  mov    0x10(%rsp),%r9d
  mov    %rbp,%rsi
  lea    0x1(%r10),%edx
  mov    %r10d,0xc(%rsp)
  mov    %r9d,%ecx
  mov    %r9d,0x8(%rsp)
  call   <merge>
  mov    0x8(%rsp),%ecx
  mov    0xc(%rsp),%edx
  mov    %r12,%r8
  mov    0x4(%rsp),%esi
  mov    %rbp,%rdi
  call   <sort@plt>
  mov    0x8(%rsp),%r9d
L30:
  lea    0x1(%r9),%r11d
  cmp    %r11d,%ebx
  jle    L132
  lea    (%rbx,%r11,1),%eax
  mov    (%rsp),%edi
  mov    %r11d,%edx
  mov    %r12,%r8
  mov    %eax,%r10d
  mov    %rbp,%rsi
  mov    %r9d,0x10(%rsp)
  shr    $0x1f,%r10d
  mov    %r11d,0xc(%rsp)
  add    %eax,%r10d
  sar    %r10d
  mov    %r10d,%ecx
  mov    %r10d,0x8(%rsp)
  call   <merge>
  mov    0x8(%rsp),%r10d
  mov    (%rsp),%edi
  mov    %r12,%r8
  mov    %ebx,%ecx
  mov    %rbp,%rsi
  lea    0x1(%r10),%edx
  call   <merge>
  mov    0x8(%rsp),%edx
  mov    0xc(%rsp),%esi
  mov    %r12,%r8
  mov    %ebx,%ecx
  mov    %rbp,%rdi
  call   <sort@plt>
  mov    0x10(%rsp),%r9d
L132:
  mov    0x4(%rsp),%esi
  mov    %r12,%r8
  mov    %ebx,%ecx
  mov    %r9d,%edx
  mov    %rbp,%rdi
  call   <sort@plt>
L61:
  lea    0x1(%rbx),%r10d
  cmp    %r10d,%r15d
  jle    L173
  lea    (%r15,%r10,1),%eax
  mov    (%rsp),%edi
  mov    %r10d,%edx
  mov    %r12,%r8
  mov    %eax,%r9d
  mov    %rbp,%rsi
  mov    %r10d,0xc(%rsp)
  shr    $0x1f,%r9d
  add    %eax,%r9d
  sar    %r9d
  mov    %r9d,%ecx
  mov    %r9d,0x8(%rsp)
  call   <merge>
  mov    0x8(%rsp),%r9d
  mov    (%rsp),%edi
  mov    %r12,%r8
  mov    %r15d,%ecx
  mov    %rbp,%rsi
  lea    0x1(%r9),%edx
  call   <merge>
  mov    0x8(%rsp),%edx
  mov    0xc(%rsp),%esi
  mov    %r12,%r8
  mov    %r15d,%ecx
  mov    %rbp,%rdi
  call   <sort@plt>
L173:
  mov    0x4(%rsp),%esi
  mov    %r12,%r8
  mov    %r15d,%ecx
  mov    %ebx,%edx
  mov    %rbp,%rdi
  call   <sort@plt>
L113:
  lea    0x1(%r15),%r9d
  cmp    %r9d,%r14d
  jle    L90
  lea    (%r14,%r9,1),%eax
  mov    %eax,%ebx
  shr    $0x1f,%ebx
  add    %eax,%ebx
  sar    %ebx
  cmp    %r9d,%ebx
  jle    L133
  lea    (%r9,%rbx,1),%eax
  mov    (%rsp),%edi
  mov    %r9d,%edx
  mov    %r12,%r8
  mov    %eax,%r10d
  mov    %rbp,%rsi
  mov    %r9d,0xc(%rsp)
  shr    $0x1f,%r10d
  add    %eax,%r10d
  sar    %r10d
  mov    %r10d,%ecx
  mov    %r10d,0x8(%rsp)
  call   <merge>
  mov    0x8(%rsp),%r10d
  mov    (%rsp),%edi
  mov    %r12,%r8
  mov    %ebx,%ecx
  mov    %rbp,%rsi
  lea    0x1(%r10),%edx
  call   <merge>
  mov    0xc(%rsp),%r9d
  mov    0x8(%rsp),%edx
  mov    %ebx,%ecx
  mov    %r12,%r8
  mov    %rbp,%rdi
  mov    %r9d,%esi
  mov    %r9d,0x8(%rsp)
  call   <sort@plt>
  mov    0x8(%rsp),%r9d
L133:
  lea    0x1(%rbx),%r11d
  cmp    %r11d,%r14d
  jle    L213
  lea    (%r14,%r11,1),%eax
  mov    %eax,%r10d
  shr    $0x1f,%r10d
  add    %eax,%r10d
  sar    %r10d
  cmp    %r11d,%r10d
  jle    L225
  lea    (%r11,%r10,1),%edx
  mov    (%rsp),%edi
  mov    %r12,%r8
  mov    %rbp,%rsi
  mov    %edx,%eax
  mov    %r9d,0x18(%rsp)
  shr    $0x1f,%eax
  mov    %r11d,0x14(%rsp)
  add    %edx,%eax
  mov    %r11d,%edx
  mov    %r10d,0xc(%rsp)
  sar    %eax
  mov    %eax,%ecx
  mov    %eax,0x8(%rsp)
  call   <merge>
  mov    0x8(%rsp),%eax
  mov    (%rsp),%edi
  mov    %r12,%r8
  mov    0xc(%rsp),%r10d
  mov    %rbp,%rsi
  lea    0x1(%rax),%edx
  mov    %eax,0x10(%rsp)
  mov    %r10d,%ecx
  mov    %r10d,0x8(%rsp)
  call   <merge>
  mov    0x8(%rsp),%r10d
  mov    %r12,%r8
  mov    %rbp,%rdi
  mov    0x14(%rsp),%r11d
  mov    0x10(%rsp),%edx
  mov    %r10d,%ecx
  mov    %r10d,0xc(%rsp)
  mov    %r11d,%esi
  mov    %r11d,0x8(%rsp)
  call   <sort@plt>
  mov    0x18(%rsp),%r9d
  mov    0xc(%rsp),%r10d
  mov    0x8(%rsp),%r11d
L225:
  mov    (%rsp),%edi
  lea    0x1(%r10),%edx
  mov    %r12,%r8
  mov    %r14d,%ecx
  mov    %rbp,%rsi
  mov    %r9d,0xc(%rsp)
  mov    %r11d,0x10(%rsp)
  mov    %r10d,0x8(%rsp)
  call   <merge>
  mov    0x8(%rsp),%edx
  mov    0x10(%rsp),%esi
  mov    %r12,%r8
  mov    %r14d,%ecx
  mov    %rbp,%rdi
  call   <sort@plt>
  mov    0xc(%rsp),%r9d
L213:
  mov    %r12,%r8
  mov    %r14d,%ecx
  mov    %ebx,%edx
  mov    %r9d,%esi
  mov    %rbp,%rdi
  call   <sort@plt>
L90:
  mov    0x4(%rsp),%esi
  mov    %r12,%r8
  mov    %r14d,%ecx
  mov    %r15d,%edx
  mov    %rbp,%rdi
  call   <sort@plt>
L89:
  lea    0x1(%r14),%r15d
  cmp    %r15d,%r13d
  jle    L40
  lea    (%r15,%r13,1),%edx
  mov    %edx,%eax
  shr    $0x1f,%eax
  add    %edx,%eax
  sar    %eax
  mov    %eax,0x8(%rsp)
  cmp    %r15d,%eax
  jle    L186
  add    %r15d,%eax
  mov    %eax,%ebx
  shr    $0x1f,%ebx
  add    %eax,%ebx
  sar    %ebx
  cmp    %r15d,%ebx
  jle    L178
  lea    (%r15,%rbx,1),%eax
  mov    %eax,%r9d
  shr    $0x1f,%r9d
  add    %eax,%r9d
  sar    %r9d
  cmp    %r15d,%r9d
  jle    L60
  lea    (%r15,%r9,1),%eax
  mov    (%rsp),%edi
  mov    %r12,%r8
  mov    %r15d,%edx
  mov    %eax,%r10d
  mov    %rbp,%rsi
  mov    %r9d,0x14(%rsp)
  shr    $0x1f,%r10d
  add    %eax,%r10d
  sar    %r10d
  mov    %r10d,%ecx
  mov    %r10d,0xc(%rsp)
  call   <merge>
  mov    0xc(%rsp),%r10d
  mov    (%rsp),%edi
  mov    %r12,%r8
  mov    0x14(%rsp),%r9d
  mov    %rbp,%rsi
  lea    0x1(%r10),%edx
  mov    %r10d,0x10(%rsp)
  mov    %r9d,%ecx
  mov    %r9d,0xc(%rsp)
  call   <merge>
  mov    0xc(%rsp),%ecx
  mov    0x10(%rsp),%edx
  mov    %r12,%r8
  mov    %r15d,%esi
  mov    %rbp,%rdi
  call   <sort@plt>
  mov    0xc(%rsp),%r9d
L60:
  lea    0x1(%r9),%r10d
  cmp    %r10d,%ebx
  jle    L83
  lea    (%rbx,%r10,1),%edx
  mov    (%rsp),%edi
  mov    %r12,%r8
  mov    %rbp,%rsi
  mov    %edx,%eax
  mov    %r9d,0x14(%rsp)
  shr    $0x1f,%eax
  mov    %r10d,0x10(%rsp)
  add    %edx,%eax
  mov    %r10d,%edx
  sar    %eax
  mov    %eax,%ecx
  mov    %eax,0xc(%rsp)
  call   <merge>
  mov    0xc(%rsp),%r11d
  mov    (%rsp),%edi
  mov    %r12,%r8
  mov    %ebx,%ecx
  mov    %rbp,%rsi
  lea    0x1(%r11),%edx
  call   <merge>
  mov    0xc(%rsp),%edx
  mov    0x10(%rsp),%esi
  mov    %r12,%r8
  mov    %ebx,%ecx
  mov    %rbp,%rdi
  call   <sort@plt>
  mov    0x14(%rsp),%r9d
L83:
  mov    %r12,%r8
  mov    %ebx,%ecx
  mov    %r9d,%edx
  mov    %r15d,%esi
  mov    %rbp,%rdi
  call   <sort@plt>
L178:
  mov    0x8(%rsp),%eax
  lea    0x1(%rbx),%r10d
  cmp    %r10d,%eax
  jle    L43
  add    %r10d,%eax
  mov    (%rsp),%edi
  mov    %r10d,%edx
  mov    %r12,%r8
  mov    %eax,%r9d
  mov    %rbp,%rsi
  mov    %r10d,0x10(%rsp)
  shr    $0x1f,%r9d
  add    %eax,%r9d
  sar    %r9d
  mov    %r9d,%ecx
  mov    %r9d,0xc(%rsp)
  call   <merge>
  mov    0xc(%rsp),%r9d
  mov    (%rsp),%edi
  mov    %r12,%r8
  mov    0x8(%rsp),%ecx
  mov    %rbp,%rsi
  lea    0x1(%r9),%edx
  call   <merge>
  mov    0x8(%rsp),%ecx
  mov    0xc(%rsp),%edx
  mov    %r12,%r8
  mov    0x10(%rsp),%esi
  mov    %rbp,%rdi
  call   <sort@plt>
L43:
  mov    0x8(%rsp),%ecx
  mov    %r12,%r8
  mov    %ebx,%edx
  mov    %r15d,%esi
  mov    %rbp,%rdi
  call   <sort@plt>
L186:
  mov    0x8(%rsp),%eax
  lea    0x1(%rax),%ebx
  cmp    %ebx,%r13d
  jle    L171
  lea    0x0(%r13,%rbx,1),%edx
  mov    %edx,%eax
  shr    $0x1f,%eax
  add    %edx,%eax
  sar    %eax
  mov    %eax,%r10d
  cmp    %ebx,%eax
  jle    L74
  lea    (%rbx,%rax,1),%edx
  mov    %edx,%eax
  shr    $0x1f,%eax
  add    %edx,%eax
  sar    %eax
  mov    %eax,%r9d
  cmp    %ebx,%eax
  jle    L153
  lea    (%rbx,%rax,1),%eax
  mov    (%rsp),%edi
  mov    %r12,%r8
  mov    %ebx,%edx
  mov    %eax,%r11d
  mov    %rbp,%rsi
  mov    %r10d,0x18(%rsp)
  shr    $0x1f,%r11d
  mov    %r9d,0x14(%rsp)
  add    %eax,%r11d
  sar    %r11d
  mov    %r11d,%ecx
  mov    %r11d,0xc(%rsp)
  call   <merge>
  mov    0xc(%rsp),%r11d
  mov    (%rsp),%edi
  mov    %r12,%r8
  mov    0x14(%rsp),%r9d
  mov    %rbp,%rsi
  lea    0x1(%r11),%edx
  mov    %r11d,0x10(%rsp)
  mov    %r9d,%ecx
  mov    %r9d,0xc(%rsp)
  call   <merge>
  mov    0xc(%rsp),%ecx
  mov    0x10(%rsp),%edx
  mov    %r12,%r8
  mov    %ebx,%esi
  mov    %rbp,%rdi
  call   <sort@plt>
  mov    0x18(%rsp),%r10d
  mov    0xc(%rsp),%r9d
L153:
  lea    0x1(%r9),%r11d
  cmp    %r11d,%r10d
  jle    L234
  lea    (%r10,%r11,1),%edx
  mov    (%rsp),%edi
  mov    %r12,%r8
  mov    %rbp,%rsi
  mov    %edx,%eax
  mov    %r9d,0x1c(%rsp)
  shr    $0x1f,%eax
  mov    %r11d,0x14(%rsp)
  add    %edx,%eax
  mov    %r11d,%edx
  mov    %r10d,0x18(%rsp)
  sar    %eax
  mov    %eax,%ecx
  mov    %eax,0xc(%rsp)
  call   <merge>
  mov    0xc(%rsp),%eax
  mov    (%rsp),%edi
  mov    %r12,%r8
  mov    0x18(%rsp),%r10d
  mov    %rbp,%rsi
  lea    0x1(%rax),%edx
  mov    %eax,0x10(%rsp)
  mov    %r10d,%ecx
  mov    %r10d,0xc(%rsp)
  call   <merge>
  mov    0xc(%rsp),%ecx
  mov    0x10(%rsp),%edx
  mov    %r12,%r8
  mov    0x14(%rsp),%esi
  mov    %rbp,%rdi
  call   <sort@plt>
  mov    0x1c(%rsp),%r9d
  mov    0xc(%rsp),%r10d
L234:
  mov    %r10d,%ecx
  mov    %r12,%r8
  mov    %r9d,%edx
  mov    %ebx,%esi
  mov    %rbp,%rdi
  mov    %r10d,0xc(%rsp)
  call   <sort@plt>
  mov    0xc(%rsp),%r10d
L74:
  lea    0x1(%r10),%r9d
  cmp    %r9d,%r13d
  jle    L85
  lea    0x0(%r13,%r9,1),%edx
  mov    %edx,%eax
  shr    $0x1f,%eax
  add    %edx,%eax
  sar    %eax
  mov    %eax,%r11d
  cmp    %r9d,%eax
  jle    L221
  lea    (%r9,%rax,1),%edx
  mov    %eax,0x10(%rsp)
  mov    (%rsp),%edi
  mov    %r12,%r8
  mov    %edx,%eax
  mov    %rbp,%rsi
  mov    %r10d,0x1c(%rsp)
  shr    $0x1f,%eax
  mov    %r9d,0x18(%rsp)
  add    %edx,%eax
  mov    %r9d,%edx
  sar    %eax
  mov    %eax,%ecx
  mov    %eax,0xc(%rsp)
  call   <merge>
  mov    0xc(%rsp),%eax
  mov    (%rsp),%edi
  mov    %r12,%r8
  mov    0x10(%rsp),%r11d
  mov    %rbp,%rsi
  lea    0x1(%rax),%edx
  mov    %eax,0x14(%rsp)
  mov    %r11d,%ecx
  mov    %r11d,0xc(%rsp)
  call   <merge>
  mov    0xc(%rsp),%r11d
  mov    %r12,%r8
  mov    %rbp,%rdi
  mov    0x18(%rsp),%r9d
  mov    0x14(%rsp),%edx
  mov    %r11d,%ecx
  mov    %r11d,0x10(%rsp)
  mov    %r9d,%esi
  mov    %r9d,0xc(%rsp)
  call   <sort@plt>
  mov    0x1c(%rsp),%r10d
  mov    0x10(%rsp),%r11d
  mov    0xc(%rsp),%r9d
L221:
  lea    0x1(%r11),%eax
  cmp    %eax,%r13d
  jle    L34
  lea    0x0(%r13,%rax,1),%ecx
  mov    (%rsp),%edi
  mov    %r12,%r8
  mov    %rbp,%rsi
  mov    %ecx,%edx
  mov    %r11d,0x1c(%rsp)
  shr    $0x1f,%edx
  mov    %r10d,0x18(%rsp)
  add    %ecx,%edx
  mov    %r9d,0x14(%rsp)
  sar    %edx
  mov    %eax,0x10(%rsp)
  mov    %edx,%ecx
  mov    %edx,0xc(%rsp)
  mov    %eax,%edx
  call   <merge>
  mov    0xc(%rsp),%edx
  mov    (%rsp),%edi
  mov    %r12,%r8
  mov    %r13d,%ecx
  mov    %rbp,%rsi
  add    $0x1,%edx
  call   <merge>
  mov    0xc(%rsp),%edx
  mov    0x10(%rsp),%esi
  mov    %r12,%r8
  mov    %r13d,%ecx
  mov    %rbp,%rdi
  call   <sort@plt>
  mov    0x1c(%rsp),%r11d
  mov    0x18(%rsp),%r10d
  mov    0x14(%rsp),%r9d
L34:
  mov    %r12,%r8
  mov    %r13d,%ecx
  mov    %r11d,%edx
  mov    %r9d,%esi
  mov    %rbp,%rdi
  mov    %r10d,(%rsp)
  call   <sort@plt>
  mov    (%rsp),%r10d
L85:
  mov    %r12,%r8
  mov    %r13d,%ecx
  mov    %r10d,%edx
  mov    %ebx,%esi
  mov    %rbp,%rdi
  call   <sort@plt>
L171:
  mov    0x8(%rsp),%edx
  mov    %r12,%r8
  mov    %r13d,%ecx
  mov    %r15d,%esi
  mov    %rbp,%rdi
  call   <sort@plt>
L40:
  mov    0x4(%rsp),%esi
  add    $0x28,%rsp
  mov    %r12,%r8
  mov    %r13d,%ecx
  pop    %rbx
  mov    %r14d,%edx
  mov    %rbp,%rdi
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  jmp    1050 <sort@plt>
  nopl   0x0(%rax)
L156:
  add    $0x28,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
```

assistant: ```c
void merge(int n, int *A, int start, int end, int cmp(const void *, const void *)) {
  if ((end - start) < 1) {
    return;
  }
  int middle = (start + end) / 2;
  merge(n, A, start, middle, cmp);
  merge(n, A, middle + 1, end, cmp);
  sort(A, start, middle, end, cmp);
}
```