user: 请从给定的汇编指令推导出C源代码：

```asm
<cov>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  mov    %rsi,%r12
  xor    %esi,%esi
  push   %rbx
  sub    $0x68,%rsp
  mov    %rdi,-0x70(%rbp)
  mov    (%rdi),%rdi
  mov    %rdx,-0x78(%rbp)
  mov    %ecx,-0x84(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x38(%rbp)
  mov    %r8d,%eax
  mov    %r8d,-0x48(%rbp)
  imul   %r8d,%eax
  lea    0x0(,%rax,8),%edx
  mov    %eax,-0x88(%rbp)
  call   <memset@plt>
  movslq -0x48(%rbp),%rax
  mov    %rsp,%rcx
  mov    %rax,%r8
  lea    0xf(,%rax,8),%rax
  mov    %rax,%rdx
  and    $0xfffffffffffff000,%rax
  sub    %rax,%rcx
  and    $0xfffffffffffffff0,%rdx
  cmp    %rcx,%rsp
  je     L174
L165:
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  cmp    %rcx,%rsp
  jne    L165
L174:
  mov    %rdx,%rax
  and    $0xfff,%eax
  sub    %rax,%rsp
  test   %rax,%rax
  jne    L72
  mov    %rsp,%rbx
  cmp    $0x3,%r8d
  je     L115
L21:
  mov    -0x84(%rbp),%eax
  test   %eax,%eax
  jle    L147
  mov    -0x84(%rbp),%eax
  mov    %r12,-0x58(%rbp)
  lea    -0x1(%r8),%r15d
  mov    %r8d,%r10d
  lea    0x8(%rbx,%r15,8),%r9
  shl    $0x3,%r10
  sub    $0x1,%eax
  lea    0x8(%r12,%rax,8),%rax
  mov    %rax,-0x80(%rbp)
  mov    %r8d,%eax
  shr    %eax
  lea    -0x1(%rax),%r12d
  mov    %r8d,%eax
  and    $0xfffffffe,%eax
  add    $0x1,%r12
  movslq %eax,%r13
  mov    %eax,-0x4c(%rbp)
  lea    0x8(%rbx),%rax
  shl    $0x4,%r12
  mov    %rax,-0x48(%rbp)
  lea    0x0(,%r13,8),%r14
  nopl   0x0(%rax,%rax,1)
L153:
  mov    -0x58(%rbp),%rax
  mov    -0x78(%rbp),%rdx
  mov    %r8d,%ecx
  mov    %rbx,%rdi
  mov    %r9,-0x68(%rbp)
  mov    (%rax),%rsi
  mov    %r10,-0x60(%rbp)
  mov    %r8d,-0x50(%rbp)
  call   <sub@plt>
  mov    -0x50(%rbp),%r8d
  mov    -0x60(%rbp),%r10
  mov    -0x68(%rbp),%r9
  test   %r8d,%r8d
  jle    L138
  mov    -0x70(%rbp),%r11
  mov    %rbx,%rsi
  cs nopw 0x0(%rax,%rax,1)
L105:
  mov    (%r11),%rax
  mov    %rsi,%rcx
  add    $0x8,%rsi
  cmp    -0x48(%rbp),%rax
  setne  %dil
  cmp    $0x1,%r8d
  setne  %dl
  test   %dl,%dil
  je     L114
  lea    (%rax,%r10,1),%rdx
  cmp    %rdx,%rcx
  setae  %dil
  cmp    %rsi,%rax
  setae  %dl
  or     %dil,%dl
  je     L114
  movsd  (%rcx),%xmm1
  xor    %edx,%edx
  unpcklpd %xmm1,%xmm1
  cs nopw 0x0(%rax,%rax,1)
L133:
  movupd (%rbx,%rdx,1),%xmm0
  movupd (%rax,%rdx,1),%xmm2
  mulpd  %xmm1,%xmm0
  addpd  %xmm2,%xmm0
  movups %xmm0,(%rax,%rdx,1)
  add    $0x10,%rdx
  cmp    %r12,%rdx
  jne    L133
  cmp    %r8d,-0x4c(%rbp)
  je     L102
  movsd  (%rbx,%r13,8),%xmm0
  mulsd  (%rcx),%xmm0
  add    %r14,%rax
  addsd  (%rax),%xmm0
  movsd  %xmm0,(%rax)
L102:
  add    $0x8,%r11
  cmp    %r9,%rsi
  jne    L105
L138:
  addq   $0x8,-0x58(%rbp)
  mov    -0x58(%rbp),%rax
  cmp    -0x80(%rbp),%rax
  jne    L153
L147:
  mov    -0x70(%rbp),%rax
  mov    (%rax),%rdi
L170:
  pxor   %xmm1,%xmm1
  movsd  D8(%rip),%xmm0
  mov    -0x88(%rbp),%ecx
  mov    %rdi,%rsi
  cvtsi2sdl -0x84(%rbp),%xmm1
  divsd  %xmm1,%xmm0
  cvttsd2si %xmm0,%edx
  call   <mult@plt>
  mov    -0x38(%rbp),%rax
  sub    %fs:0x28,%rax
  jne    L81
  lea    -0x28(%rbp),%rsp
  pop    %rbx
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  pop    %rbp
  ret
L115:
  mov    -0x70(%rbp),%rax
  mov    -0x84(%rbp),%esi
  mov    (%rax),%rdi
  test   %esi,%esi
  jle    L170
  lea    -0x1(%rsi),%ecx
  mov    0x8(%rax),%rdx
  mov    -0x78(%rbp),%rsi
  mov    0x10(%rax),%rax
  lea    0x8(%r12,%rcx,8),%rcx
L166:
  mov    (%r12),%r8
  add    $0x8,%r12
  movsd  (%r8),%xmm0
  subsd  (%rsi),%xmm0
  movsd  %xmm0,(%rbx)
  movsd  0x8(%r8),%xmm1
  subsd  0x8(%rsi),%xmm1
  mulsd  %xmm0,%xmm0
  movsd  %xmm1,0x8(%rbx)
  movsd  0x10(%r8),%xmm1
  subsd  0x10(%rsi),%xmm1
  movsd  %xmm1,0x10(%rbx)
  addsd  (%rdi),%xmm0
  movsd  %xmm0,(%rdi)
  movsd  (%rbx),%xmm0
  mulsd  0x8(%rbx),%xmm0
  addsd  0x8(%rdi),%xmm0
  movsd  %xmm0,0x8(%rdi)
  movsd  (%rbx),%xmm0
  mulsd  0x10(%rbx),%xmm0
  addsd  0x10(%rdi),%xmm0
  movsd  %xmm0,0x10(%rdi)
  movsd  0x8(%rbx),%xmm0
  mulsd  (%rbx),%xmm0
  addsd  (%rdx),%xmm0
  movsd  %xmm0,(%rdx)
  movsd  0x8(%rbx),%xmm0
  mulsd  %xmm0,%xmm0
  addsd  0x8(%rdx),%xmm0
  movsd  %xmm0,0x8(%rdx)
  movsd  0x8(%rbx),%xmm0
  mulsd  0x10(%rbx),%xmm0
  addsd  0x10(%rdx),%xmm0
  movsd  %xmm0,0x10(%rdx)
  movsd  0x10(%rbx),%xmm0
  mulsd  (%rbx),%xmm0
  addsd  (%rax),%xmm0
  movsd  %xmm0,(%rax)
  movsd  0x10(%rbx),%xmm0
  mulsd  0x8(%rbx),%xmm0
  addsd  0x8(%rax),%xmm0
  movsd  %xmm0,0x8(%rax)
  movsd  0x10(%rbx),%xmm0
  mulsd  %xmm0,%xmm0
  addsd  0x10(%rax),%xmm0
  movsd  %xmm0,0x10(%rax)
  cmp    %r12,%rcx
  jne    L166
  jmp    L170
  nopw   0x0(%rax,%rax,1)
L114:
  xor    %edx,%edx
  nopw   0x0(%rax,%rax,1)
L68:
  movsd  (%rbx,%rdx,8),%xmm0
  mulsd  (%rcx),%xmm0
  mov    %rdx,%rdi
  addsd  (%rax,%rdx,8),%xmm0
  movsd  %xmm0,(%rax,%rdx,8)
  add    $0x1,%rdx
  cmp    %r15,%rdi
  jne    L68
  jmp    L102
L72:
  orq    $0x0,-0x8(%rsp,%rax,1)
  mov    %rsp,%rbx
  cmp    $0x3,%r8d
  jne    L21
  jmp    L115
L81:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: extract_symbolic_data
arguments: data_label: D8
datatype: byte[8]

tool: {"D8": [0x00,0x00,0x00,0x00,0x00,0x00,0xf0,0x3f]}

assistant: ```c
void cov(double **S, double **X, double *mu, int n, int m) {
  int i, j, k;
  memset(S[0], 0, m * m * sizeof(double));
  double dx[m];
  if (m == 3) {
    for (i = 0; i < n; i++) {
      dx[0] = X[i][0] - mu[0];
      dx[1] = X[i][1] - mu[1];
      dx[2] = X[i][2] - mu[2];
      S[0][0] += dx[0] * dx[0];
      S[0][1] += dx[0] * dx[1];
      S[0][2] += dx[0] * dx[2];
      S[1][0] += dx[1] * dx[0];
      S[1][1] += dx[1] * dx[1];
      S[1][2] += dx[1] * dx[2];
      S[2][0] += dx[2] * dx[0];
      S[2][1] += dx[2] * dx[1];
      S[2][2] += dx[2] * dx[2];
    }
  } else {
    for (i = 0; i < n; i++) {
      sub(dx, X[i], mu, m);
      for (j = 0; j < m; j++)
        for (k = 0; k < m; k++)
          S[j][k] += dx[j] * dx[k];
    }
  }
  mult(S[0], S[0], 1 / (double)n, m * m);
}
```