user: 这段汇编代码用C语言表示是什么样的：

```asm
<ff_dm_quad>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0xb0,%rsp
  mov    %rdi,-0x68(%rbp)
  mov    %esi,-0x6c(%rbp)
  mov    %rdx,-0x78(%rbp)
  mov    %rcx,-0x80(%rbp)
  mov    %r8,-0x88(%rbp)
  movsd  %xmm0,-0x90(%rbp)
  mov    %r9,-0x98(%rbp)
  mov    0x10(%rbp),%rax
  mov    %rax,-0xa0(%rbp)
  mov    0x18(%rbp),%rax
  mov    %rax,-0xa8(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x8(%rbp)
  xor    %eax,%eax
  pxor   %xmm0,%xmm0
  movsd  %xmm0,-0x40(%rbp)
  movq   $0x0,-0x58(%rbp)
  jmp    L74
L20:
  movq   $0x0,-0x50(%rbp)
  jmp    L34
L5:
  mov    -0x58(%rbp),%rax
  imul   -0x68(%rbp),%rax
  mov    %rax,%rdx
  mov    -0x50(%rbp),%rax
  add    %rdx,%rax
  lea    0x0(,%rax,8),%rdx
  mov    -0x80(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  movsd  %xmm0,-0x38(%rbp)
  mov    -0x58(%rbp),%rax
  imul   -0x68(%rbp),%rax
  mov    %rax,%rdx
  mov    -0x50(%rbp),%rax
  add    %rdx,%rax
  lea    0x0(,%rax,8),%rdx
  mov    -0x88(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  movsd  %xmm0,-0x30(%rbp)
  movsd  -0x38(%rbp),%xmm0
  pxor   %xmm1,%xmm1
  comisd %xmm1,%xmm0
  jbe    L54
  cmpl   $0x0,-0x6c(%rbp)
  je     L72
  mov    -0x50(%rbp),%rdx
  mov    %rdx,%rax
  add    %rax,%rax
  add    %rdx,%rax
  shl    $0x3,%rax
  mov    %rax,%rdx
  mov    -0x78(%rbp),%rax
  lea    (%rdx,%rax,1),%rsi
  mov    -0x58(%rbp),%rdx
  mov    %rdx,%rax
  add    %rax,%rax
  add    %rdx,%rax
  shl    $0x3,%rax
  mov    %rax,%rdx
  mov    -0x78(%rbp),%rax
  lea    (%rdx,%rax,1),%rdi
  mov    -0xa8(%rbp),%rcx
  mov    -0xa0(%rbp),%rdx
  lea    -0x20(%rbp),%rax
  mov    %rcx,%r8
  mov    %rdx,%rcx
  mov    %rax,%rdx
  call   <distance_delta_periodic@plt>
  movq   %xmm0,%rax
  mov    %rax,-0x48(%rbp)
  jmp    L83
L72:
  mov    -0x50(%rbp),%rdx
  mov    %rdx,%rax
  add    %rax,%rax
  add    %rdx,%rax
  shl    $0x3,%rax
  mov    %rax,%rdx
  mov    -0x78(%rbp),%rax
  lea    (%rdx,%rax,1),%rsi
  mov    -0x58(%rbp),%rdx
  mov    %rdx,%rax
  add    %rax,%rax
  add    %rdx,%rax
  shl    $0x3,%rax
  mov    %rax,%rdx
  mov    -0x78(%rbp),%rax
  lea    (%rdx,%rax,1),%rcx
  lea    -0x20(%rbp),%rax
  mov    %rax,%rdx
  mov    %rcx,%rdi
  call   <distance_delta@plt>
  movq   %xmm0,%rax
  mov    %rax,-0x48(%rbp)
L83:
  movsd  -0x48(%rbp),%xmm0
  subsd  -0x38(%rbp),%xmm0
  movsd  %xmm0,-0x28(%rbp)
  movsd  -0x90(%rbp),%xmm0
  mulsd  -0x30(%rbp),%xmm0
  mulsd  -0x28(%rbp),%xmm0
  mulsd  -0x28(%rbp),%xmm0
  movsd  -0x40(%rbp),%xmm1
  addsd  %xmm1,%xmm0
  movsd  %xmm0,-0x40(%rbp)
  cmpq   $0x0,-0x98(%rbp)
  je     L54
  movsd  -0x90(%rbp),%xmm0
  addsd  %xmm0,%xmm0
  mulsd  -0x30(%rbp),%xmm0
  mulsd  -0x28(%rbp),%xmm0
  divsd  -0x48(%rbp),%xmm0
  movsd  %xmm0,-0x28(%rbp)
  mov    -0x98(%rbp),%r8
  lea    -0x20(%rbp),%rcx
  mov    -0x78(%rbp),%rdx
  mov    -0x28(%rbp),%rdi
  mov    -0x50(%rbp),%rsi
  mov    -0x58(%rbp),%rax
  movq   %rdi,%xmm0
  mov    %rax,%rdi
  call   <add_grad@plt>
L54:
  addq   $0x1,-0x50(%rbp)
L34:
  mov    -0x50(%rbp),%rax
  cmp    -0x58(%rbp),%rax
  jb     L5
  addq   $0x1,-0x58(%rbp)
L74:
  mov    -0x58(%rbp),%rax
  cmp    -0x68(%rbp),%rax
  jb     L20
  movsd  -0x40(%rbp),%xmm0
  movq   %xmm0,%rax
  mov    -0x8(%rbp),%rdx
  sub    %fs:0x28,%rdx
  je     L27
  call   <__stack_chk_fail@plt>
L27:
  movq   %rax,%xmm0
  leave
  ret
```

assistant: ```c
double ff_dm_quad(size_t natom, int periodic, double *cor, double *dm0, double *dmk, double amp, double *gradient, double *matrix, double *reciprocal) {
  size_t i, j;
  double delta[3], d, d0, k, tmp, result;
  result = 0.0;
  for (i = 0; i < natom; i++) {
    for (j = 0; j < i; j++) {
      d0 = dm0[i * natom + j];
      k = dmk[i * natom + j];
      if (d0 > 0) {
        if (periodic) {
          d = distance_delta_periodic(cor + 3 * i, cor + 3 * j, delta, matrix, reciprocal);
        } else {
          d = distance_delta(cor + 3 * i, cor + 3 * j, delta);
        }
        tmp = (d - d0);
        result += amp * k * tmp * tmp;
        if (gradient != NULL) {
          tmp = 2 * amp * k * tmp / d;
          add_grad(i, j, tmp, cor, delta, gradient);
        }
      }
    }
  }
  return result;
}
```