user: 请将这段汇编代码片段转换成等效的C代码：

```asm
<d2Sdiag2D>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x118,%rsp
  mov    %rdi,0x48(%rsp)
  mov    %rsi,0x50(%rsp)
  mov    %rdx,%rbx
  mov    %rcx,%rsi
  mov    %fs:0x28,%rax
  mov    %rax,0x108(%rsp)
  xor    %eax,%eax
  cvttsd2si (%r9),%edx
  cvttsd2si 0x8(%r9),%eax
  mov    %eax,0x44(%rsp)
  lea    0x1(%rdx),%ecx
  add    $0x1,%eax
  imul   %ecx,%eax
  movsd  (%r8),%xmm0
  mulsd  0x8(%r8),%xmm0
  mulsd  0x10(%rsi),%xmm0
  movsd  %xmm0,(%rsp)
  test   %edx,%edx
  jle    L73
  movslq %ecx,%rcx
  mov    %rcx,0x58(%rsp)
  lea    0x8(,%rcx,8),%r15
  mov    %edx,%ecx
  mov    %rcx,0x68(%rsp)
  cltq
  shl    $0x3,%rax
  mov    %rax,0x8(%rsp)
  movq   $0x0,0x60(%rsp)
  mov    %rbx,%rbp
  mov    %r15,%rbx
  jmp    L19
L26:
  addl   $0x1,0x40(%rsp)
  mov    0x40(%rsp),%eax
  mov    0x58(%rsp),%rsi
  add    %rsi,0x20(%rsp)
  cmp    %eax,0x44(%rsp)
  je     L95
L48:
  mov    0x20(%rsp),%rax
  shl    $0x3,%rax
  mov    %rax,0x28(%rsp)
  mov    0x50(%rsp),%rdx
  add    %rax,%rdx
  mov    $0x0,%eax
L59:
  movsd  (%rdx),%xmm0
  movsd  %xmm0,0x70(%rsp,%rax,1)
  movsd  0x8(%rdx),%xmm3
  movsd  %xmm3,0x80(%rsp,%rax,1)
  movsd  (%rdx,%rbx,1),%xmm1
  movsd  %xmm1,0xa0(%rsp,%rax,1)
  movsd  -0x8(%rdx,%rbx,1),%xmm2
  movsd  %xmm2,0x90(%rsp,%rax,1)
  addsd  %xmm3,%xmm0
  addsd  %xmm2,%xmm0
  addsd  %xmm1,%xmm0
  mulsd  D2(%rip),%xmm0
  movsd  %xmm0,0xb0(%rsp,%rax,1)
  movq   $0x0,0xc0(%rsp,%rax,1)
  movq   $0x0,0xd0(%rsp,%rax,1)
  movq   $0x0,0xe0(%rsp,%rax,1)
  movq   $0x0,0xf0(%rsp,%rax,1)
  add    0x8(%rsp),%rdx
  add    $0x8,%rax
  cmp    $0x10,%rax
  jne    L59
  lea    0xf0(%rsp),%rax
  lea    0xd0(%rsp),%r13
  lea    0xc0(%rsp),%r12
  lea    0xb0(%rsp),%rdi
  lea    0x80(%rsp),%r14
  lea    0x70(%rsp),%r11
  sub    $0x8,%rsp
  lea    0xe8(%rsp),%r15
  push   %r15
  movsd  0x10(%rsp),%xmm1
  mov    %rax,0x20(%rsp)
  mov    %rax,%r9
  mov    %r13,%r8
  mov    %r12,%rcx
  movsd  0x0(%rbp),%xmm0
  mov    %rdi,0x28(%rsp)
  mov    %rdi,%rdx
  mov    %r14,%rsi
  mov    %r11,0x40(%rsp)
  mov    %r11,%rdi
  call   <d2SdiagTriangle@plt>
  movsd  0x8(%rbp),%xmm0
  lea    0xb0(%rsp),%r10
  mov    %r12,(%rsp)
  movsd  0x10(%rsp),%xmm1
  mov    %r15,%r9
  mov    0x20(%rsp),%r8
  mov    %r13,%rcx
  mov    0x28(%rsp),%rdx
  mov    %r10,0x48(%rsp)
  mov    %r10,%rsi
  mov    %r14,%rdi
  call   <d2SdiagTriangle@plt>
  movsd  0x10(%rbp),%xmm0
  lea    0xa0(%rsp),%r14
  mov    %r13,(%rsp)
  movsd  0x10(%rsp),%xmm1
  mov    %r12,%r9
  mov    %r15,%r8
  mov    0x20(%rsp),%rcx
  mov    0x28(%rsp),%rdx
  mov    %r14,%rsi
  mov    0x48(%rsp),%rdi
  call   <d2SdiagTriangle@plt>
  movsd  0x18(%rbp),%xmm0
  add    $0x8,%rsp
  push   0x18(%rsp)
  movsd  0x10(%rsp),%xmm1
  mov    %r13,%r9
  mov    %r12,%r8
  mov    %r15,%rcx
  mov    0x28(%rsp),%rdx
  mov    0x40(%rsp),%rsi
  mov    %r14,%rdi
  call   <d2SdiagTriangle@plt>
  mov    0x38(%rsp),%rax
  add    0x58(%rsp),%rax
  add    $0x10,%rsp
  mov    $0x0,%edx
  mov    %r12,%r8
  mov    %r13,%rdi
  lea    0xf0(%rsp),%rsi
  mov    %r15,%rcx
L33:
  movsd  (%rax),%xmm0
  addsd  (%rdx,%r8,1),%xmm0
  movsd  %xmm0,(%rax)
  movsd  0x8(%rax),%xmm0
  addsd  (%rdx,%rdi,1),%xmm0
  movsd  %xmm0,0x8(%rax)
  movsd  (%rax,%rbx,1),%xmm0
  addsd  (%rdx,%rsi,1),%xmm0
  movsd  %xmm0,(%rax,%rbx,1)
  movsd  -0x8(%rax,%rbx,1),%xmm0
  addsd  (%rdx,%rcx,1),%xmm0
  movsd  %xmm0,-0x8(%rax,%rbx,1)
  add    0x8(%rsp),%rax
  add    $0x8,%rdx
  cmp    $0x10,%rdx
  jne    L33
  jmp    L26
L95:
  addq   $0x1,0x60(%rsp)
  mov    0x60(%rsp),%rax
  cmp    0x68(%rsp),%rax
  je     L73
L19:
  mov    0x60(%rsp),%rax
  mov    %rax,0x20(%rsp)
  movl   $0x0,0x40(%rsp)
  cmpl   $0x0,0x44(%rsp)
  jg     L48
  jmp    L95
L73:
  mov    0x108(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L11
  add    $0x118,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L11:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: unpack_data
arguments: tag: D2
data_type: f64

tool: D2: 0.25

assistant: ```c
void d2Sdiag2D(double *prod, const double *yc, const double *VRef, const double *alpha, const double *h, const double *m, const int n) {
  int idn, i1, i2, r, comp;
  double yA[2], yB[2], yC[2], yD[2], yM[2];
  double rA[2], rB[2], rC[2], rD[2];
  const int m1 = m[0], m2 = m[1];
  const int nn = (m1 + 1) * (m2 + 1);
  const double hd = h[0] * h[1];
  const double alphaVolume = alpha[2] * hd;
  const int inc_x = 1;
  const int inc_y = m1 + 1;
  const double *ptr;
  double *wptr;
#pragma omp parallel private(wptr, ptr, idn, i1, i2, r, comp, yA, yB, yC, yD, yM, rA, rB, rC, rD)
  {
#pragma omp for
    for (i1 = 0; i1 < m1; i1++) {
      for (i2 = 0; i2 < m2; i2++) {
        idn = i1 + i2 * (m1 + 1);
        comp = 0;
        for (r = 0; r < 2; r++) {
          ptr = yc + idn + comp;
          yA[r] = *ptr;
          ptr = ptr + inc_x;
          yB[r] = *ptr;
          ptr = ptr + inc_y;
          yD[r] = *ptr;
          ptr = ptr - inc_x;
          yC[r] = *ptr;
          yM[r] = 0.25 * (yA[r] + yB[r] + yC[r] + yD[r]);
          rA[r] = 0.0;
          rB[r] = 0.0;
          rC[r] = 0.0;
          rD[r] = 0.0;
          comp += nn;
        }
        d2SdiagTriangle(yA, yB, yM, VRef[0], rA, rB, rD, rC, alphaVolume);
        d2SdiagTriangle(yB, yD, yM, VRef[1], rB, rD, rC, rA, alphaVolume);
        d2SdiagTriangle(yD, yC, yM, VRef[2], rD, rC, rA, rB, alphaVolume);
        d2SdiagTriangle(yC, yA, yM, VRef[3], rC, rA, rB, rD, alphaVolume);
        comp = 0;
        for (r = 0; r < 2; r++) {
          wptr = prod + idn + comp;
#pragma omp atomic
          *wptr += rA[r];
          wptr += inc_x;
#pragma omp atomic
          *wptr += rB[r];
          wptr += inc_y;
#pragma omp atomic
          *wptr += rD[r];
          wptr -= inc_x;
#pragma omp atomic
          *wptr += rC[r];
          comp += nn;
        }
      }
    }
  }
}
```