user: 请将这段汇编代码片段转换成等效的C代码:

```asm
<merge>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x48,%rsp
  mov    %rdi,%r14
  mov    %rdi,0x38(%rsp)
  mov    %rsi,%rbx
  mov    %rcx,%r12
  mov    %rsi,%rax
  sub    %rdi,%rax
  lea    (%rax,%rcx,1),%r15
  sub    %rsi,%rdx
  lea    (%rdx,%rcx,1),%rbp
  mov    %rbp,0x28(%rsp)
  lea    (%rcx,%r15,1),%rdi
  call   <malloc@plt>
  mov    %rax,0x8(%rsp)
  lea    (%r12,%rbp,1),%rdi
  call   <malloc@plt>
  mov    %rax,%r13
  mov    %rax,0x18(%rsp)
  mov    %r15,%rdx
  mov    %r14,%rsi
  mov    0x8(%rsp),%rdi
  call   <memcpy@plt>
  mov    %rbp,%rdx
  mov    %rbx,%rsi
  mov    %r13,%rdi
  call   <memcpy@plt>
  mov    %r15,0x30(%rsp)
  mov    %r15,%rax
  mov    $0x0,%edx
  div    %r12
  mov    %rax,0x10(%rsp)
  cmp    %r15,%r12
  ja     L58
  mov    %rbp,0x28(%rsp)
  mov    %rbp,%rax
  mov    $0x0,%edx
  div    %r12
  mov    %rax,0x20(%rsp)
  cmp    %rbp,%r12
  ja     L53
  mov    $0x1,%r13d
  mov    $0x0,%r15d
  movl   $0x0,0x4(%rsp)
  mov    $0x0,%ebp
  mov    $0x0,%ebx
  jmp    L18
L0:
  mov    %r12,%rdx
  mov    %rbx,%rsi
  mov    %r14,%rdi
  call   <memcpy@plt>
  mov    %r13d,%eax
  addl   $0x1,0x4(%rsp)
L35:
  movslq 0x4(%rsp),%rbx
  cmp    0x10(%rsp),%rbx
  jae    L28
  movslq %r15d,%rbp
  add    $0x1,%r13d
  add    %r12,%r14
  cmp    0x20(%rsp),%rbp
  jae    L78
L18:
  imul   %r12,%rbp
  add    0x18(%rsp),%rbp
  imul   %r12,%rbx
  add    0x8(%rsp),%rbx
  mov    %rbp,%rsi
  mov    %rbx,%rdi
  call   <compare@plt>
  test   %rax,%rax
  js     L0
  mov    %r12,%rdx
  mov    %rbp,%rsi
  mov    %r14,%rdi
  call   <memcpy@plt>
  mov    %r13d,%eax
  add    $0x1,%r15d
  jmp    L35
L28:
  cmp    0x10(%rsp),%rbx
  jne    L78
L36:
  cltq
  imul   %r12,%rax
  mov    0x30(%rsp),%rdx
  add    0x28(%rsp),%rdx
  sub    %rax,%rdx
  movslq %r15d,%r15
  imul   %r12,%r15
  mov    0x18(%rsp),%rsi
  add    %r15,%rsi
  mov    0x38(%rsp),%rdi
  add    %rax,%rdi
  call   <memcpy@plt>
  jmp    L57
L58:
  mov    $0x0,%eax
  mov    $0x0,%r15d
  jmp    L36
L53:
  mov    $0x0,%eax
  mov    $0x0,%ebx
L78:
  cltq
  imul   %r12,%rax
  mov    0x30(%rsp),%rdx
  add    0x28(%rsp),%rdx
  sub    %rax,%rdx
  imul   %r12,%rbx
  mov    0x8(%rsp),%rsi
  add    %rbx,%rsi
  mov    0x38(%rsp),%rdi
  add    %rax,%rdi
  call   <memcpy@plt>
L57:
  add    $0x48,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
```

assistant: ```c
void merge(void *low, void *mid, void *high, size_t width, int (*comp)(const void *, const void *)) {
  size_t nl = (char *)mid - (char *)low + width;
  size_t nr = (char *)high - (char *)mid + width;
  char *left = malloc(nl + width);
  char *right = malloc(nr + width);
  memcpy(left, low, nl);
  memcpy(right, mid, nr);
  int i = 0, j = 0, k = 0;
  char *clow = (char *)low;
  while (i < nl / width && j < nr / width) {
    if (compare(left + i * width, right + j * width) < 0) {
      memcpy(clow + k * width, left + i * width, width);
      ++k;
      ++i;
    } else {
      memcpy(clow + k * width, right + j * width, width);
      ++k;
      ++j;
    }
  }
  if (i == nl / width) {
    memcpy(clow + k * width, right + j * width, nl + nr - k * width);
  } else {
    memcpy(clow + k * width, left + i * width, nr + nl - k * width);
  }
}
```