user: 提供的汇编代码用C语言表示会是什么样子：

```asm
<bot_matrix_mean_cov_2d>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  mov    %rdi,-0x28(%rbp)
  mov    %esi,-0x2c(%rbp)
  mov    %rdx,-0x38(%rbp)
  mov    %rcx,-0x40(%rbp)
  mov    -0x38(%rbp),%rax
  add    $0x8,%rax
  pxor   %xmm0,%xmm0
  movsd  %xmm0,(%rax)
  movsd  (%rax),%xmm0
  mov    -0x38(%rbp),%rax
  movsd  %xmm0,(%rax)
  movl   $0x0,-0x18(%rbp)
  jmp    L37
L26:
  mov    -0x38(%rbp),%rax
  movsd  (%rax),%xmm1
  mov    -0x18(%rbp),%eax
  add    %eax,%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  addsd  %xmm1,%xmm0
  mov    -0x38(%rbp),%rax
  movsd  %xmm0,(%rax)
  mov    -0x38(%rbp),%rax
  add    $0x8,%rax
  movsd  (%rax),%xmm1
  mov    -0x18(%rbp),%eax
  add    %eax,%eax
  cltq
  add    $0x1,%rax
  lea    0x0(,%rax,8),%rdx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  mov    -0x38(%rbp),%rax
  add    $0x8,%rax
  addsd  %xmm1,%xmm0
  movsd  %xmm0,(%rax)
  addl   $0x1,-0x18(%rbp)
L37:
  mov    -0x18(%rbp),%eax
  cmp    -0x2c(%rbp),%eax
  jl     L26
  mov    -0x38(%rbp),%rax
  movsd  (%rax),%xmm0
  pxor   %xmm1,%xmm1
  cvtsi2sdl -0x2c(%rbp),%xmm1
  divsd  %xmm1,%xmm0
  mov    -0x38(%rbp),%rax
  movsd  %xmm0,(%rax)
  mov    -0x38(%rbp),%rax
  add    $0x8,%rax
  movsd  (%rax),%xmm0
  pxor   %xmm1,%xmm1
  cvtsi2sdl -0x2c(%rbp),%xmm1
  mov    -0x38(%rbp),%rax
  add    $0x8,%rax
  divsd  %xmm1,%xmm0
  movsd  %xmm0,(%rax)
  mov    -0x40(%rbp),%rax
  lea    0x18(%rax),%rdx
  pxor   %xmm0,%xmm0
  movsd  %xmm0,(%rdx)
  mov    -0x40(%rbp),%rax
  add    $0x8,%rax
  movsd  (%rdx),%xmm0
  movsd  %xmm0,(%rax)
  movsd  (%rax),%xmm0
  mov    -0x40(%rbp),%rax
  movsd  %xmm0,(%rax)
  movl   $0x0,-0x14(%rbp)
  jmp    L1
L29:
  mov    -0x14(%rbp),%eax
  add    %eax,%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  mov    -0x38(%rbp),%rax
  movsd  (%rax),%xmm1
  subsd  %xmm1,%xmm0
  movsd  %xmm0,-0x10(%rbp)
  mov    -0x14(%rbp),%eax
  add    %eax,%eax
  cltq
  add    $0x1,%rax
  lea    0x0(,%rax,8),%rdx
  mov    -0x28(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  mov    -0x38(%rbp),%rax
  add    $0x8,%rax
  movsd  (%rax),%xmm1
  subsd  %xmm1,%xmm0
  movsd  %xmm0,-0x8(%rbp)
  mov    -0x40(%rbp),%rax
  movsd  (%rax),%xmm1
  movsd  -0x10(%rbp),%xmm0
  mulsd  %xmm0,%xmm0
  addsd  %xmm1,%xmm0
  mov    -0x40(%rbp),%rax
  movsd  %xmm0,(%rax)
  mov    -0x40(%rbp),%rax
  add    $0x8,%rax
  movsd  (%rax),%xmm1
  movsd  -0x10(%rbp),%xmm0
  mulsd  -0x8(%rbp),%xmm0
  mov    -0x40(%rbp),%rax
  add    $0x8,%rax
  addsd  %xmm1,%xmm0
  movsd  %xmm0,(%rax)
  mov    -0x40(%rbp),%rax
  add    $0x18,%rax
  movsd  (%rax),%xmm1
  movsd  -0x8(%rbp),%xmm0
  mulsd  %xmm0,%xmm0
  mov    -0x40(%rbp),%rax
  add    $0x18,%rax
  addsd  %xmm1,%xmm0
  movsd  %xmm0,(%rax)
  addl   $0x1,-0x14(%rbp)
L1:
  mov    -0x14(%rbp),%eax
  cmp    -0x2c(%rbp),%eax
  jl     L29
  mov    -0x40(%rbp),%rax
  movsd  (%rax),%xmm0
  mov    -0x2c(%rbp),%eax
  sub    $0x1,%eax
  pxor   %xmm1,%xmm1
  cvtsi2sd %eax,%xmm1
  divsd  %xmm1,%xmm0
  mov    -0x40(%rbp),%rax
  movsd  %xmm0,(%rax)
  mov    -0x40(%rbp),%rax
  add    $0x8,%rax
  movsd  (%rax),%xmm0
  mov    -0x2c(%rbp),%eax
  sub    $0x1,%eax
  pxor   %xmm1,%xmm1
  cvtsi2sd %eax,%xmm1
  mov    -0x40(%rbp),%rax
  add    $0x8,%rax
  divsd  %xmm1,%xmm0
  movsd  %xmm0,(%rax)
  mov    -0x40(%rbp),%rax
  add    $0x18,%rax
  movsd  (%rax),%xmm0
  mov    -0x2c(%rbp),%eax
  sub    $0x1,%eax
  pxor   %xmm1,%xmm1
  cvtsi2sd %eax,%xmm1
  mov    -0x40(%rbp),%rax
  add    $0x18,%rax
  divsd  %xmm1,%xmm0
  movsd  %xmm0,(%rax)
  mov    -0x40(%rbp),%rax
  lea    0x10(%rax),%rdx
  mov    -0x40(%rbp),%rax
  movsd  0x8(%rax),%xmm0
  movsd  %xmm0,(%rdx)
  nop
  pop    %rbp
  ret
```

assistant: ```c
void bot_matrix_mean_cov_2d(const double *X, int n, double mean[2], double cov[4]) {
  mean[0] = mean[1] = 0;
  for (int i = 0; i < n; i++) {
    mean[0] += X[i * 2 + 0];
    mean[1] += X[i * 2 + 1];
  }
  mean[0] /= n;
  mean[1] /= n;
  cov[0] = cov[1] = cov[3] = 0;
  for (int i = 0; i < n; i++) {
    double da = X[i * 2 + 0] - mean[0];
    double db = X[i * 2 + 1] - mean[1];
    cov[0] += da * da;
    cov[1] += da * db;
    cov[3] += db * db;
  }
  cov[0] /= n - 1;
  cov[1] /= n - 1;
  cov[3] /= n - 1;
  cov[2] = cov[1];
}
```