user: 提供的汇编代码用C语言表示会是什么样子：

```asm
<corner_dlauum_nt_2x2_lib4>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  mov    %rdi,-0x48(%rbp)
  mov    %rsi,-0x50(%rbp)
  mov    %edx,-0x54(%rbp)
  mov    %rcx,-0x60(%rbp)
  mov    %r8,-0x68(%rbp)
  movl   $0x4,-0x3c(%rbp)
  mov    -0x48(%rbp),%rax
  movsd  (%rax),%xmm0
  movsd  %xmm0,-0x20(%rbp)
  mov    -0x50(%rbp),%rax
  movsd  (%rax),%xmm0
  movsd  %xmm0,-0x18(%rbp)
  movsd  -0x20(%rbp),%xmm0
  mulsd  -0x18(%rbp),%xmm0
  movsd  %xmm0,-0x38(%rbp)
  mov    -0x3c(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x48(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  movsd  %xmm0,-0x20(%rbp)
  mov    -0x3c(%rbp),%eax
  add    $0x1,%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x48(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  movsd  %xmm0,-0x10(%rbp)
  mov    -0x3c(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x50(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  movsd  %xmm0,-0x18(%rbp)
  mov    -0x3c(%rbp),%eax
  add    $0x1,%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x50(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  movsd  %xmm0,-0x8(%rbp)
  movsd  -0x20(%rbp),%xmm0
  mulsd  -0x18(%rbp),%xmm0
  movsd  -0x38(%rbp),%xmm1
  addsd  %xmm1,%xmm0
  movsd  %xmm0,-0x38(%rbp)
  movsd  -0x10(%rbp),%xmm0
  mulsd  -0x18(%rbp),%xmm0
  movsd  %xmm0,-0x30(%rbp)
  movsd  -0x10(%rbp),%xmm0
  mulsd  -0x8(%rbp),%xmm0
  movsd  %xmm0,-0x28(%rbp)
  cmpl   $0x0,-0x54(%rbp)
  je     L9
  cmpl   $0x1,-0x54(%rbp)
  jne    L21
  mov    -0x60(%rbp),%rax
  movsd  (%rax),%xmm0
  movsd  -0x38(%rbp),%xmm1
  addsd  %xmm1,%xmm0
  movsd  %xmm0,-0x38(%rbp)
  mov    -0x60(%rbp),%rax
  add    $0x8,%rax
  movsd  (%rax),%xmm0
  movsd  -0x30(%rbp),%xmm1
  addsd  %xmm1,%xmm0
  movsd  %xmm0,-0x30(%rbp)
  mov    -0x3c(%rbp),%eax
  add    $0x1,%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x60(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  movsd  -0x28(%rbp),%xmm1
  addsd  %xmm1,%xmm0
  movsd  %xmm0,-0x28(%rbp)
  jmp    L9
L21:
  mov    -0x60(%rbp),%rax
  movsd  (%rax),%xmm0
  subsd  -0x38(%rbp),%xmm0
  movsd  %xmm0,-0x38(%rbp)
  mov    -0x60(%rbp),%rax
  add    $0x8,%rax
  movsd  (%rax),%xmm0
  subsd  -0x30(%rbp),%xmm0
  movsd  %xmm0,-0x30(%rbp)
  mov    -0x3c(%rbp),%eax
  add    $0x1,%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x60(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  subsd  -0x28(%rbp),%xmm0
  movsd  %xmm0,-0x28(%rbp)
L9:
  mov    -0x68(%rbp),%rax
  movsd  -0x38(%rbp),%xmm0
  movsd  %xmm0,(%rax)
  mov    -0x68(%rbp),%rax
  add    $0x8,%rax
  movsd  -0x30(%rbp),%xmm0
  movsd  %xmm0,(%rax)
  mov    -0x3c(%rbp),%eax
  add    $0x1,%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x68(%rbp),%rax
  add    %rdx,%rax
  movsd  -0x28(%rbp),%xmm0
  movsd  %xmm0,(%rax)
  nop
  pop    %rbp
  ret
```

assistant: ```c
void corner_dlauum_nt_2x2_lib4(double *A, double *B, int alg, double *C, double *D) {
  const int bs = 4;
  double a_0, a_1, b_0, b_1, d_00, d_10, d_11;
  a_0 = A[0 + bs * 0];
  b_0 = B[0 + bs * 0];
  d_00 = a_0 * b_0;
  a_0 = A[0 + bs * 1];
  a_1 = A[1 + bs * 1];
  b_0 = B[0 + bs * 1];
  b_1 = B[1 + bs * 1];
  d_00 += a_0 * b_0;
  d_10 = a_1 * b_0;
  d_11 = a_1 * b_1;
  if (alg != 0) {
    if (alg == 1) {
      d_00 = C[0 + bs * 0] + d_00;
      d_10 = C[1 + bs * 0] + d_10;
      d_11 = C[1 + bs * 1] + d_11;
    } else {
      d_00 = C[0 + bs * 0] - d_00;
      d_10 = C[1 + bs * 0] - d_10;
      d_11 = C[1 + bs * 1] - d_11;
    }
  }
  D[0 + bs * 0] = d_00;
  D[1 + bs * 0] = d_10;
  D[1 + bs * 1] = d_11;
}
```