user: 提供的汇编代码用C语言表示会是什么样子：

```asm
<merge>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  mov    %rdi,-0x28(%rbp)
  mov    %rsi,-0x30(%rbp)
  mov    %edx,-0x34(%rbp)
  mov    %ecx,-0x38(%rbp)
  mov    %r8,-0x40(%rbp)
  movl   $0x0,-0x1c(%rbp)
  mov    -0x1c(%rbp),%eax
  mov    %eax,-0x20(%rbp)
  mov    -0x40(%rbp),%rax
  mov    %rax,-0x18(%rbp)
  mov    -0x30(%rbp),%rax
  mov    %rax,-0x10(%rbp)
  mov    -0x34(%rbp),%eax
  cltq
  lea    0x0(,%rax,4),%rdx
  mov    -0x30(%rbp),%rax
  add    %rdx,%rax
  mov    %rax,-0x8(%rbp)
  jmp    L26
L46:
  mov    -0x10(%rbp),%rax
  mov    (%rax),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm1
  mov    -0x8(%rbp),%rax
  mov    (%rax),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  comisd %xmm1,%xmm0
  jb     L78
  mov    -0x10(%rbp),%rdx
  lea    0x4(%rdx),%rax
  mov    %rax,-0x10(%rbp)
  mov    -0x18(%rbp),%rax
  lea    0x4(%rax),%rcx
  mov    %rcx,-0x18(%rbp)
  mov    (%rdx),%edx
  mov    %edx,(%rax)
  addl   $0x1,-0x20(%rbp)
  jmp    L26
L78:
  mov    -0x8(%rbp),%rdx
  lea    0x4(%rdx),%rax
  mov    %rax,-0x8(%rbp)
  mov    -0x18(%rbp),%rax
  lea    0x4(%rax),%rcx
  mov    %rcx,-0x18(%rbp)
  mov    (%rdx),%edx
  mov    %edx,(%rax)
  addl   $0x1,-0x1c(%rbp)
L26:
  mov    -0x20(%rbp),%eax
  cmp    -0x34(%rbp),%eax
  jge    L9
  mov    -0x1c(%rbp),%eax
  cmp    -0x38(%rbp),%eax
  jl     L46
  jmp    L9
L79:
  mov    -0x10(%rbp),%rdx
  lea    0x4(%rdx),%rax
  mov    %rax,-0x10(%rbp)
  mov    -0x18(%rbp),%rax
  lea    0x4(%rax),%rcx
  mov    %rcx,-0x18(%rbp)
  mov    (%rdx),%edx
  mov    %edx,(%rax)
  addl   $0x1,-0x20(%rbp)
L9:
  mov    -0x20(%rbp),%eax
  cmp    -0x34(%rbp),%eax
  jl     L79
  jmp    L16
L80:
  mov    -0x8(%rbp),%rdx
  lea    0x4(%rdx),%rax
  mov    %rax,-0x8(%rbp)
  mov    -0x18(%rbp),%rax
  lea    0x4(%rax),%rcx
  mov    %rcx,-0x18(%rbp)
  mov    (%rdx),%edx
  mov    %edx,(%rax)
  addl   $0x1,-0x1c(%rbp)
L16:
  mov    -0x1c(%rbp),%eax
  cmp    -0x38(%rbp),%eax
  jl     L80
  mov    -0x40(%rbp),%rax
  mov    %rax,-0x18(%rbp)
  mov    -0x30(%rbp),%rax
  mov    %rax,-0x10(%rbp)
  mov    -0x34(%rbp),%edx
  mov    -0x38(%rbp),%eax
  add    %edx,%eax
  mov    %eax,-0x20(%rbp)
  jmp    L70
L87:
  mov    -0x18(%rbp),%rdx
  lea    0x4(%rdx),%rax
  mov    %rax,-0x18(%rbp)
  mov    -0x10(%rbp),%rax
  lea    0x4(%rax),%rcx
  mov    %rcx,-0x10(%rbp)
  mov    (%rdx),%edx
  mov    %edx,(%rax)
  subl   $0x1,-0x20(%rbp)
L70:
  cmpl   $0x0,-0x20(%rbp)
  jne    L87
  nop
  nop
  pop    %rbp
  ret
```

assistant: ```c
void merge(double *vals, int *indices, int length1, int length2, int *space) {
  int n1, n2;
  int *spaceptr;
  int *index1, *index2;
  n1 = n2 = 0;
  spaceptr = space;
  index1 = indices;
  index2 = indices + length1;
  while (n1 < length1 && n2 < length2) {
    if (vals[*index1] <= vals[*index2]) {
      *spaceptr++ = *index1++;
      ++n1;
    } else {
      *spaceptr++ = *index2++;
      ++n2;
    }
  }
  while (n1 < length1) {
    *spaceptr++ = *index1++;
    ++n1;
  }
  while (n2 < length2) {
    *spaceptr++ = *index2++;
    ++n2;
  }
  spaceptr = space;
  index1 = indices;
  for (n1 = length1 + length2; n1; n1--)
    *index1++ = *spaceptr++;
}
```