user: 这段汇编代码用C语言表示是什么样的?

```asm
<bdr>:
  endbr64
  push   %r15
  push   %r14
  mov    %rdi,%r14
  push   %r13
  mov    %rsi,%r13
  push   %r12
  mov    %rdx,%r12
  push   %rbp
  mov    %rcx,%rbp
  push   %rbx
  xor    %ebx,%ebx
  sub    $0x1d8,%rsp
  lea    0x160(%rsp),%rax
  lea    0x140(%rsp),%r15
  mov    %fs:0x28,%rcx
  mov    %rcx,0x1c8(%rsp)
  xor    %ecx,%ecx
  mov    %rax,0x20(%rsp)
  lea    0x180(%rsp),%rax
  mov    %rax,(%rsp)
  lea    0x1a0(%rsp),%rax
  mov    %rax,0x10(%rsp)
L9:
  movsd  (%r14,%rbx,1),%xmm0
  mov    0x20(%rsp),%rax
  movsd  %xmm0,(%r15,%rbx,1)
  movsd  0x0(%r13,%rbx,1),%xmm0
  movsd  %xmm0,(%rax,%rbx,1)
  movsd  (%r12,%rbx,1),%xmm0
  call   <log@plt>
  mov    (%rsp),%rax
  movsd  %xmm0,(%rax,%rbx,1)
  movsd  0x0(%rbp,%rbx,1),%xmm0
  call   <log@plt>
  mov    0x10(%rsp),%rax
  movsd  %xmm0,(%rax,%rbx,1)
  add    $0x8,%rbx
  cmp    $0x20,%rbx
  jne    L9
  movsd  0x158(%rsp),%xmm3
  minsd  0x178(%rsp),%xmm3
  movsd  0x140(%rsp),%xmm2
  maxsd  0x160(%rsp),%xmm2
  movapd 0x170(%rsp),%xmm1
  movlpd 0x168(%rsp),%xmm1
  movapd %xmm3,%xmm0
  mulsd  %xmm3,%xmm0
  movapd %xmm2,%xmm4
  mulsd  %xmm2,%xmm4
  movapd %xmm0,%xmm7
  mulsd  %xmm3,%xmm0
  subsd  %xmm4,%xmm7
  mulsd  %xmm2,%xmm4
  movq   %xmm7,%rcx
  movapd %xmm0,%xmm7
  subsd  %xmm4,%xmm7
  mulsd  %xmm3,%xmm0
  subsd  %xmm2,%xmm3
  mulsd  %xmm2,%xmm4
  movapd 0x160(%rsp),%xmm2
  movsd  %xmm3,0xb8(%rsp)
  movq   %xmm7,%rdx
  movapd 0x140(%rsp),%xmm7
  movhpd 0x170(%rsp),%xmm2
  movhpd 0x150(%rsp),%xmm7
  subsd  %xmm4,%xmm0
  movapd %xmm7,%xmm3
  movapd %xmm7,%xmm15
  movapd 0x1a0(%rsp),%xmm4
  unpcklpd %xmm2,%xmm15
  unpckhpd %xmm2,%xmm3
  movapd 0x180(%rsp),%xmm2
  movapd 0x1b0(%rsp),%xmm7
  movapd %xmm3,%xmm11
  movapd %xmm15,%xmm6
  movapd %xmm15,%xmm9
  movlpd 0x1a8(%rsp),%xmm7
  movhpd 0x190(%rsp),%xmm2
  movq   %xmm0,%rax
  movapd 0x150(%rsp),%xmm0
  movlpd 0x148(%rsp),%xmm0
  movhpd 0x1b0(%rsp),%xmm4
  movapd %xmm2,%xmm8
  movaps %xmm15,0xa0(%rsp)
  movapd %xmm0,%xmm5
  unpckhpd %xmm1,%xmm0
  unpcklpd %xmm4,%xmm8
  unpcklpd %xmm1,%xmm5
  unpckhpd %xmm4,%xmm2
  movapd %xmm8,%xmm3
  movapd 0x190(%rsp),%xmm1
  movapd %xmm5,%xmm12
  movapd %xmm0,%xmm8
  movaps %xmm2,(%rsp)
  movlpd 0x188(%rsp),%xmm1
  mulpd  %xmm0,%xmm8
  movapd %xmm12,%xmm10
  movapd %xmm5,%xmm2
  movapd %xmm1,%xmm4
  unpckhpd %xmm7,%xmm1
  movaps %xmm2,0x80(%rsp)
  movaps %xmm1,0x10(%rsp)
  mulpd  %xmm15,%xmm6
  unpcklpd %xmm7,%xmm4
  movapd %xmm5,%xmm7
  mulpd  %xmm5,%xmm7
  movapd %xmm11,%xmm15
  movaps %xmm15,0x90(%rsp)
  movapd %xmm8,%xmm1
  movapd %xmm8,%xmm13
  mulpd  %xmm0,%xmm1
  mulpd  %xmm6,%xmm9
  mulpd  %xmm7,%xmm10
  movapd %xmm7,%xmm5
  movapd %xmm11,%xmm7
  mulpd  %xmm11,%xmm7
  movapd %xmm1,%xmm14
  movapd %xmm1,%xmm12
  mulpd  %xmm5,%xmm1
  mulpd  %xmm7,%xmm11
  mulpd  %xmm7,%xmm14
  mulpd  %xmm11,%xmm13
  subpd  %xmm13,%xmm14
  movapd %xmm8,%xmm13
  mulpd  %xmm10,%xmm13
  movaps %xmm14,0x70(%rsp)
  movapd %xmm1,%xmm14
  movapd %xmm11,%xmm1
  mulpd  %xmm5,%xmm1
  subpd  %xmm13,%xmm14
  movapd %xmm7,%xmm13
  mulpd  %xmm10,%xmm13
  movaps %xmm14,0x30(%rsp)
  movapd 0x30(%rsp),%xmm14
  mulpd  %xmm15,%xmm14
  subpd  %xmm13,%xmm1
  movapd 0x70(%rsp),%xmm13
  mulpd  %xmm2,%xmm13
  movaps %xmm1,0x60(%rsp)
  movapd %xmm1,%xmm2
  movapd %xmm12,%xmm1
  mulpd  %xmm0,%xmm2
  mulpd  %xmm6,%xmm1
  subpd  %xmm14,%xmm13
  movapd %xmm1,%xmm15
  addpd  %xmm2,%xmm13
  movapd %xmm8,%xmm1
  mulpd  %xmm9,%xmm1
  movapd %xmm11,%xmm2
  mulpd  %xmm6,%xmm2
  movaps %xmm13,0x100(%rsp)
  movapd 0xa0(%rsp),%xmm13
  xorpd  D4(%rip),%xmm13
  movapd %xmm1,%xmm14
  movapd %xmm15,%xmm1
  movapd %xmm2,%xmm15
  movapd %xmm7,%xmm2
  subpd  %xmm14,%xmm1
  mulpd  %xmm9,%xmm2
  movaps %xmm1,0x20(%rsp)
  movapd 0x20(%rsp),%xmm1
  mulpd  0x80(%rsp),%xmm1
  movapd %xmm2,%xmm14
  movapd %xmm15,%xmm2
  movapd 0x20(%rsp),%xmm15
  mulpd  0x90(%rsp),%xmm15
  subpd  %xmm14,%xmm2
  movapd 0x70(%rsp),%xmm14
  mulpd  %xmm13,%xmm14
  movaps %xmm2,0x50(%rsp)
  mulpd  %xmm0,%xmm2
  mulpd  0x60(%rsp),%xmm13
  addpd  %xmm15,%xmm14
  movapd %xmm2,%xmm15
  movapd %xmm14,%xmm2
  subpd  %xmm15,%xmm2
  movapd %xmm10,%xmm15
  mulpd  %xmm6,%xmm15
  movaps %xmm2,0xf0(%rsp)
  movapd %xmm5,%xmm2
  mulpd  %xmm9,%xmm2
  movapd %xmm2,%xmm14
  movapd %xmm15,%xmm2
  subpd  %xmm14,%xmm2
  movapd 0x30(%rsp),%xmm14
  mulpd  0xa0(%rsp),%xmm14
  movaps %xmm2,0xe0(%rsp)
  mulpd  %xmm0,%xmm2
  subpd  %xmm1,%xmm14
  movapd 0x50(%rsp),%xmm1
  movapd %xmm2,%xmm15
  movapd 0x80(%rsp),%xmm2
  addpd  %xmm14,%xmm15
  mulpd  %xmm1,%xmm2
  addpd  %xmm2,%xmm13
  movapd 0xe0(%rsp),%xmm2
  mulpd  0x90(%rsp),%xmm2
  subpd  %xmm2,%xmm13
  movapd 0x10(%rsp),%xmm2
  movapd %xmm13,%xmm14
  movapd 0xf0(%rsp),%xmm13
  addpd  0x100(%rsp),%xmm13
  movaps %xmm14,0x130(%rsp)
  addpd  %xmm15,%xmm13
  addpd  %xmm14,%xmm13
  movaps %xmm13,0x40(%rsp)
  movapd (%rsp),%xmm13
  mulpd  %xmm12,%xmm13
  movapd %xmm13,%xmm14
  movapd %xmm11,%xmm13
  mulpd  %xmm2,%xmm13
  subpd  %xmm13,%xmm14
  movapd %xmm12,%xmm13
  mulpd  %xmm4,%xmm13
  mulpd  %xmm3,%xmm12
  movaps %xmm14,0x120(%rsp)
  movapd %xmm13,%xmm14
  movapd %xmm10,%xmm13
  mulpd  %xmm2,%xmm13
  movapd %xmm14,%xmm2
  subpd  %xmm13,%xmm2
  movapd %xmm11,%xmm13
  mulpd  %xmm4,%xmm13
  mulpd  %xmm3,%xmm11
  movaps %xmm2,0xd0(%rsp)
  movapd 0x10(%rsp),%xmm2
  movapd %xmm13,%xmm14
  movapd (%rsp),%xmm13
  mulpd  %xmm10,%xmm13
  mulpd  %xmm3,%xmm10
  subpd  %xmm13,%xmm14
  movapd %xmm2,%xmm13
  mulpd  %xmm9,%xmm13
  subpd  %xmm13,%xmm12
  movapd (%rsp),%xmm13
  movaps %xmm12,0x110(%rsp)
  movapd %xmm13,%xmm12
  mulpd  %xmm9,%xmm12
  mulpd  %xmm4,%xmm9
  subpd  %xmm12,%xmm11
  subpd  %xmm9,%xmm10
  movapd %xmm7,%xmm9
  mulpd  %xmm2,%xmm9
  movaps %xmm10,0xc0(%rsp)
  movapd %xmm9,%xmm10
  movapd %xmm8,%xmm9
  mulpd  %xmm13,%xmm9
  subpd  %xmm9,%xmm10
  movapd %xmm8,%xmm9
  mulpd  %xmm4,%xmm9
  mulpd  %xmm3,%xmm8
  movapd %xmm10,%xmm12
  movapd %xmm5,%xmm10
  mulpd  %xmm2,%xmm10
  subpd  %xmm9,%xmm10
  movapd (%rsp),%xmm9
  mulpd  %xmm5,%xmm9
  mulpd  %xmm3,%xmm5
  movapd %xmm10,%xmm13
  movapd %xmm9,%xmm10
  movapd %xmm7,%xmm9
  mulpd  %xmm4,%xmm9
  mulpd  %xmm3,%xmm7
  subpd  %xmm9,%xmm10
  movapd %xmm2,%xmm9
  mulpd  %xmm6,%xmm9
  subpd  %xmm8,%xmm9
  movapd (%rsp),%xmm8
  movapd 0x70(%rsp),%xmm2
  mulpd  (%rsp),%xmm15
  mulpd  %xmm6,%xmm8
  mulpd  %xmm4,%xmm6
  subpd  %xmm7,%xmm8
  movapd %xmm6,%xmm7
  movapd %xmm2,%xmm6
  subpd  %xmm5,%xmm7
  mulpd  %xmm4,%xmm6
  movapd 0x30(%rsp),%xmm5
  mulpd  (%rsp),%xmm5
  subpd  %xmm5,%xmm6
  movapd 0x60(%rsp),%xmm5
  mulpd  0x10(%rsp),%xmm5
  addpd  %xmm6,%xmm5
  movapd %xmm2,%xmm6
  movapd 0x10(%rsp),%xmm2
  mulpd  %xmm3,%xmm6
  mulpd  %xmm1,%xmm2
  movapd 0x20(%rsp),%xmm1
  mulpd  %xmm4,%xmm1
  subpd  %xmm6,%xmm5
  movapd 0x20(%rsp),%xmm6
  mulpd  (%rsp),%xmm6
  addpd  %xmm6,%xmm5
  movapd 0x30(%rsp),%xmm6
  mulpd  %xmm3,%xmm6
  subpd  %xmm2,%xmm5
  movapd 0x40(%rsp),%xmm2
  addpd  %xmm5,%xmm6
  movapd 0x10(%rsp),%xmm5
  subpd  %xmm1,%xmm6
  movapd 0xe0(%rsp),%xmm1
  mulpd  %xmm1,%xmm5
  mulpd  (%rsp),%xmm1
  addpd  %xmm6,%xmm5
  movapd 0x60(%rsp),%xmm6
  mulpd  %xmm3,%xmm6
  mulpd  0x100(%rsp),%xmm3
  subpd  %xmm6,%xmm5
  movapd 0x50(%rsp),%xmm6
  mulpd  %xmm4,%xmm6
  mulpd  0xf0(%rsp),%xmm4
  addpd  %xmm5,%xmm6
  movq   %rcx,%xmm5
  addpd  %xmm3,%xmm4
  unpcklpd %xmm5,%xmm5
  subpd  %xmm1,%xmm6
  movapd 0x10(%rsp),%xmm1
  mulpd  0x130(%rsp),%xmm1
  addpd  %xmm4,%xmm15
  movapd 0x80(%rsp),%xmm4
  divpd  %xmm2,%xmm6
  addpd  %xmm1,%xmm15
  movsd  0xb8(%rsp),%xmm1
  unpcklpd %xmm1,%xmm1
  divpd  %xmm2,%xmm15
  movapd 0xd0(%rsp),%xmm2
  mulpd  %xmm5,%xmm6
  movapd 0x90(%rsp),%xmm5
  mulpd  D35(%rip),%xmm6
  mulpd  %xmm5,%xmm2
  mulpd  %xmm15,%xmm1
  movapd 0xa0(%rsp),%xmm15
  addpd  %xmm6,%xmm1
  movapd 0x120(%rsp),%xmm6
  movapd %xmm6,%xmm3
  mulpd  %xmm4,%xmm3
  subpd  %xmm2,%xmm3
  movapd %xmm14,%xmm2
  mulpd  %xmm0,%xmm2
  mulpd  %xmm15,%xmm14
  addpd  %xmm3,%xmm2
  movapd %xmm6,%xmm3
  movapd 0x110(%rsp),%xmm6
  mulpd  %xmm15,%xmm3
  subpd  %xmm3,%xmm2
  movapd %xmm6,%xmm3
  mulpd  %xmm5,%xmm3
  mulpd  %xmm4,%xmm6
  addpd  %xmm3,%xmm2
  movapd %xmm11,%xmm3
  mulpd  %xmm0,%xmm3
  mulpd  %xmm4,%xmm11
  subpd  %xmm3,%xmm2
  movapd 0xd0(%rsp),%xmm3
  mulpd  %xmm15,%xmm3
  addpd  %xmm2,%xmm3
  subpd  %xmm6,%xmm3
  movapd 0xc0(%rsp),%xmm6
  mulpd  %xmm0,%xmm6
  movapd %xmm6,%xmm2
  movapd %xmm4,%xmm6
  movapd 0xc0(%rsp),%xmm4
  addpd  %xmm3,%xmm2
  movapd %xmm11,%xmm3
  movapd 0x40(%rsp),%xmm11
  mulpd  %xmm5,%xmm4
  subpd  %xmm14,%xmm2
  addpd  %xmm2,%xmm3
  movapd %xmm3,%xmm14
  movq   %rdx,%xmm3
  subpd  %xmm4,%xmm14
  unpcklpd %xmm3,%xmm3
  movapd %xmm6,%xmm4
  movapd %xmm14,%xmm2
  divpd  %xmm11,%xmm2
  mulpd  %xmm3,%xmm2
  movapd %xmm5,%xmm3
  divpd  D50(%rip),%xmm2
  addpd  %xmm2,%xmm1
  movapd %xmm6,%xmm2
  movapd %xmm10,%xmm6
  mulpd  %xmm13,%xmm3
  mulpd  %xmm12,%xmm2
  mulpd  %xmm0,%xmm6
  mulpd  %xmm15,%xmm12
  mulpd  %xmm15,%xmm13
  mulpd  %xmm15,%xmm10
  subpd  %xmm3,%xmm2
  movapd %xmm5,%xmm3
  mulpd  %xmm9,%xmm3
  mulpd  %xmm4,%xmm9
  addpd  %xmm6,%xmm2
  movapd %xmm8,%xmm6
  mulpd  %xmm0,%xmm6
  mulpd  %xmm7,%xmm0
  subpd  %xmm12,%xmm2
  mulpd  %xmm4,%xmm8
  mulpd  %xmm5,%xmm7
  addpd  %xmm3,%xmm2
  subpd  %xmm6,%xmm2
  addpd  %xmm2,%xmm13
  movq   %rax,%xmm2
  unpcklpd %xmm2,%xmm2
  subpd  %xmm9,%xmm13
  addpd  %xmm13,%xmm0
  subpd  %xmm10,%xmm0
  addpd  %xmm8,%xmm0
  subpd  %xmm7,%xmm0
  divpd  %xmm11,%xmm0
  mulpd  %xmm2,%xmm0
  mulpd  D48(%rip),%xmm0
  addpd  %xmm0,%xmm1
  movapd %xmm1,%xmm7
  unpckhpd %xmm7,%xmm7
  movapd %xmm7,%xmm0
  subsd  %xmm1,%xmm0
  divsd  0xb8(%rsp),%xmm0
  call   <exp@plt>
  subsd  D9(%rip),%xmm0
  mulsd  D58(%rip),%xmm0
  mov    0x1c8(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L1
  add    $0x1d8,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L1:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: extract_symbolic_data
arguments: data_label: D4
data_type: byte[16]
name: extract_symbolic_data
arguments: data_label: D35
data_type: byte[16]
name: extract_symbolic_data
arguments: data_label: D50
data_type: byte[16]
name: extract_symbolic_data
arguments: data_label: D48
data_type: byte[16]
name: extract_symbolic_data
arguments: data_label: D9
data_type: byte[8]
name: extract_symbolic_data
arguments: data_label: D58
data_type: byte[8]

tool: {"D4": [0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80]}

tool: {"D35": [0x00,0x00,0x00,0x00,0x00,0x00,0xe0,0x3f,0x00,0x00,0x00,0x00,0x00,0x00,0xe0,0x3f]}

tool: {"D50": [0x00,0x00,0x00,0x00,0x00,0x00,0x08,0x40,0x00,0x00,0x00,0x00,0x00,0x00,0x08,0x40]}

tool: {"D48": [0x00,0x00,0x00,0x00,0x00,0x00,0xd0,0x3f,0x00,0x00,0x00,0x00,0x00,0x00,0xd0,0x3f]}

tool: {"D9": [0x00,0x00,0x00,0x00,0x00,0x00,0xf0,0x3f]}

tool: {"D58": [0x00,0x00,0x00,0x00,0x00,0x00,0x59,0x40]}

assistant: ```c
double bdr(const double ref_psnr[4], const double new_psnr[4], const double ref_bitrate[4], const double new_bitrate[4]) {
  double xl, xh;
  double diff;
  double E[4], F[4], G[4], H[4];
  double SUM[2];
  int i, j;
  double DET0, DET1, DET2, DET3, DET;
  double D0, D1, D2, D3;
  double A, B, C, D;
  double X[2][4];
  double Y[2][4];
  for (i = 0; i < 4; i++) {
    X[0][i] = ref_psnr[i];
    X[1][i] = new_psnr[i];
    Y[0][i] = log(ref_bitrate[i]);
    Y[1][i] = log(new_bitrate[i]);
  }
  xl = ((X[0][0]) > (X[1][0]) ? (X[0][0]) : (X[1][0]));
  xh = ((X[0][3]) < (X[1][3]) ? (X[0][3]) : (X[1][3]));
  for (j = 0; j < 2; j++) {
    for (i = 0; i < 4; i++) {
      E[i] = X[j][i];
      F[i] = E[i] * E[i];
      G[i] = E[i] * E[i] * E[i];
      H[i] = Y[j][i];
    }
    DET0 = E[1] * (F[2] * G[3] - F[3] * G[2]) - E[2] * (F[1] * G[3] - F[3] * G[1]) + E[3] * (F[1] * G[2] - F[2] * G[1]);
    DET1 = -E[0] * (F[2] * G[3] - F[3] * G[2]) + E[2] * (F[0] * G[3] - F[3] * G[0]) - E[3] * (F[0] * G[2] - F[2] * G[0]);
    DET2 = E[0] * (F[1] * G[3] - F[3] * G[1]) - E[1] * (F[0] * G[3] - F[3] * G[0]) + E[3] * (F[0] * G[1] - F[1] * G[0]);
    DET3 = -E[0] * (F[1] * G[2] - F[2] * G[1]) + E[1] * (F[0] * G[2] - F[2] * G[0]) - E[2] * (F[0] * G[1] - F[1] * G[0]);
    DET = DET0 + DET1 + DET2 + DET3;
    D0 = H[0] * DET0 + H[1] * DET1 + H[2] * DET2 + H[3] * DET3;
    D1 = H[1] * (F[2] * G[3] - F[3] * G[2]) - H[2] * (F[1] * G[3] - F[3] * G[1]) + H[3] * (F[1] * G[2] - F[2] * G[1]) - H[0] * (F[2] * G[3] - F[3] * G[2]) + H[2] * (F[0] * G[3] - F[3] * G[0]) - H[3] * (F[0] * G[2] - F[2] * G[0]) + H[0] * (F[1] * G[3] - F[3] * G[1]) - H[1] * (F[0] * G[3] - F[3] * G[0]) + H[3] * (F[0] * G[1] - F[1] * G[0]) - H[0] * (F[1] * G[2] - F[2] * G[1]) + H[1] * (F[0] * G[2] - F[2] * G[0]) - H[2] * (F[0] * G[1] - F[1] * G[0]);
    D2 = E[1] * (H[2] * G[3] - H[3] * G[2]) - E[2] * (H[1] * G[3] - H[3] * G[1]) + E[3] * (H[1] * G[2] - H[2] * G[1]) - E[0] * (H[2] * G[3] - H[3] * G[2]) + E[2] * (H[0] * G[3] - H[3] * G[0]) - E[3] * (H[0] * G[2] - H[2] * G[0]) + E[0] * (H[1] * G[3] - H[3] * G[1]) - E[1] * (H[0] * G[3] - H[3] * G[0]) + E[3] * (H[0] * G[1] - H[1] * G[0]) - E[0] * (H[1] * G[2] - H[2] * G[1]) + E[1] * (H[0] * G[2] - H[2] * G[0]) - E[2] * (H[0] * G[1] - H[1] * G[0]);
    D3 = E[1] * (F[2] * H[3] - F[3] * H[2]) - E[2] * (F[1] * H[3] - F[3] * H[1]) + E[3] * (F[1] * H[2] - F[2] * H[1]) - E[0] * (F[2] * H[3] - F[3] * H[2]) + E[2] * (F[0] * H[3] - F[3] * H[0]) - E[3] * (F[0] * H[2] - F[2] * H[0]) + E[0] * (F[1] * H[3] - F[3] * H[1]) - E[1] * (F[0] * H[3] - F[3] * H[0]) + E[3] * (F[0] * H[1] - F[1] * H[0]) - E[0] * (F[1] * H[2] - F[2] * H[1]) + E[1] * (F[0] * H[2] - F[2] * H[0]) - E[2] * (F[0] * H[1] - F[1] * H[0]);
    A = D0 / DET;
    B = D1 / DET;
    C = D2 / DET;
    D = D3 / DET;
    SUM[j] = A * (xh - xl) + B * (xh * xh - xl * xl) / 2 + C * (xh * xh * xh - xl * xl * xl) / 3 + D * (xh * xh * xh * xh - xl * xl * xl * xl) / 4;
  }
  diff = (SUM[1] - SUM[0]) / (xh - xl);
  diff = (exp(diff) - 1) * 100;
  return diff;
}
```