user: 请将以下的汇编代码转换成C语言代码：

```asm
<calc_mean_and_covariance2>:
  endbr64
  push   %r12
  push   %rbp
  push   %rbx
  mov    %rdi,%r10
  mov    %rsi,%rdi
  mov    %edx,%r11d
  mov    %rcx,%r12
  test   %edx,%edx
  jle    L35
  mov    %r10,%r9
  lea    -0x1(%rdx),%eax
  lea    (%rax,%rax,4),%rdx
  lea    (%rax,%rdx,4),%rax
  lea    0xa8(%rsi,%rax,8),%rbp
  pxor   %xmm3,%xmm3
  movaps %xmm3,%xmm2
  movaps %xmm3,%xmm1
  mov    %r11d,%ecx
  jmp    L156
L77:
  movss  (%rbx,%rax,4),%xmm5
  addss  %xmm5,%xmm3
  mulss  %xmm5,%xmm0
  addss  %xmm0,%xmm1
  mulss  %xmm5,%xmm4
  addss  %xmm4,%xmm2
L100:
  add    $0x1,%rax
  cmp    %rcx,%rax
  je     L174
L179:
  movss  (%rdx,%rax,8),%xmm0
  ucomiss D20(%rip),%xmm0
  jp     L12
  je     L100
L12:
  movss  0x4(%rdx,%rax,8),%xmm4
  ucomiss D20(%rip),%xmm4
  jp     L77
  je     L100
  jmp    L77
L174:
  add    $0xa8,%rsi
  add    $0x54,%r9
  cmp    %rbp,%rsi
  je     L19
L156:
  mov    %rsi,%rdx
  mov    %r9,%rbx
  mov    $0x0,%eax
  jmp    L179
L35:
  pxor   %xmm3,%xmm3
  movaps %xmm3,%xmm2
  movaps %xmm3,%xmm1
L19:
  movss  %xmm1,(%r12)
  movss  %xmm2,0x4(%r12)
  movl   $0x0,(%r8)
  movl   $0x0,0x4(%r8)
  movl   $0x0,0x8(%r8)
  movl   $0x0,0xc(%r8)
  test   %r11d,%r11d
  jle    L54
  lea    -0x1(%r11),%edx
  lea    0x0(,%rdx,4),%rax
  lea    0x4(%r10,%rax,1),%rsi
  add    $0x4,%rdi
  add    %rdx,%rax
  lea    (%rdx,%rax,2),%rax
  lea    0x58(%r10,%rax,8),%r10
  mov    %r11d,%r11d
  neg    %r11
  lea    0x0(,%r11,4),%r9
  jmp    L105
L108:
  subss  %xmm1,%xmm0
  mulss  %xmm0,%xmm0
  mulss  (%rdx),%xmm0
  addss  (%r8),%xmm0
  movss  %xmm0,(%r8)
  movss  (%rcx),%xmm0
  subss  %xmm2,%xmm0
  mulss  %xmm0,%xmm0
  mulss  (%rdx),%xmm0
  addss  0xc(%r8),%xmm0
  movss  %xmm0,0xc(%r8)
  movss  -0x4(%rcx),%xmm0
  subss  %xmm1,%xmm0
  movss  (%rcx),%xmm4
  subss  %xmm2,%xmm4
  mulss  %xmm4,%xmm0
  mulss  (%rdx),%xmm0
  addss  0x4(%r8),%xmm0
  movss  %xmm0,0x4(%r8)
L96:
  add    $0x4,%rdx
  add    $0x8,%rax
  cmp    %rdx,%rsi
  je     L186
L37:
  mov    %rax,%rcx
  movss  -0x4(%rax),%xmm0
  ucomiss D20(%rip),%xmm0
  jp     L190
  je     L96
L190:
  movss  (%rcx),%xmm4
  ucomiss D20(%rip),%xmm4
  jp     L108
  je     L96
  jmp    L108
L186:
  add    $0x54,%rsi
  add    $0xa8,%rdi
  cmp    %r10,%rsi
  je     L54
L105:
  lea    (%r9,%rsi,1),%rdx
  mov    %rdi,%rax
  jmp    L37
L54:
  movss  (%r8),%xmm0
  divss  %xmm3,%xmm0
  movss  %xmm0,(%r8)
  movss  0x4(%r8),%xmm0
  divss  %xmm3,%xmm0
  movss  %xmm0,0x4(%r8)
  movss  0xc(%r8),%xmm1
  divss  %xmm3,%xmm1
  movss  %xmm1,0xc(%r8)
  movss  %xmm0,0x8(%r8)
  pop    %rbx
  pop    %rbp
  pop    %r12
  ret
```

tool_calls: name: read_data
arguments: tag: D20
type: f32

tool: D20: 100

assistant: ```c
void calc_mean_and_covariance2(float weights[21][21], float velocities[21][21][2], int weighted_size, float mean[2], float covariance[2][2]) {
  int i, j, k, Q, fdr, a, b;
  float vx, vy, w_sum;
  w_sum = vx = vy = 0.0;
  for (i = 0; i < weighted_size; i++)
    for (j = 0; j < weighted_size; j++) {
      if (velocities[i][j][0] != 100.0 && velocities[i][j][1] != 100.0) {
        w_sum += weights[i][j];
        vx += weights[i][j] * velocities[i][j][0];
        vy += weights[i][j] * velocities[i][j][1];
      }
    }
  mean[0] = vx;
  mean[1] = vy;
  for (i = 0; i < 2; i++)
    for (j = 0; j < 2; j++)
      covariance[i][j] = 0.0;
  for (i = 0; i < weighted_size; i++)
    for (j = 0; j < weighted_size; j++) {
      if (velocities[i][j][0] != 100.0 && velocities[i][j][1] != 100.0) {
        covariance[0][0] += (velocities[i][j][0] - vx) * (velocities[i][j][0] - vx) * weights[i][j];
        covariance[1][1] += (velocities[i][j][1] - vy) * (velocities[i][j][1] - vy) * weights[i][j];
        covariance[0][1] += (velocities[i][j][0] - vx) * (velocities[i][j][1] - vy) * weights[i][j];
      }
    }
  covariance[0][0] /= w_sum;
  covariance[0][1] /= w_sum;
  covariance[1][1] /= w_sum;
  covariance[1][0] = covariance[0][1];
}
```