user: Demonstrate the C code that generates the assembly output below:

```asm
<linreg>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0xc0,%rsp
  mov    %rdi,-0x88(%rbp)
  mov    %rsi,-0x90(%rbp)
  mov    %edx,-0x94(%rbp)
  mov    %rcx,-0xa0(%rbp)
  mov    %r8,-0xa8(%rbp)
  mov    %r9,-0xb0(%rbp)
  pxor   %xmm0,%xmm0
  movsd  %xmm0,-0x70(%rbp)
  pxor   %xmm0,%xmm0
  movsd  %xmm0,-0x68(%rbp)
  pxor   %xmm0,%xmm0
  movsd  %xmm0,-0x60(%rbp)
  mov    -0x90(%rbp),%rax
  movsd  (%rax),%xmm0
  movsd  %xmm0,-0x58(%rbp)
  pxor   %xmm0,%xmm0
  movsd  %xmm0,-0x50(%rbp)
  mov    -0xa8(%rbp),%rax
  pxor   %xmm0,%xmm0
  movsd  %xmm0,(%rax)
  movl   $0x0,-0x74(%rbp)
  jmp    L75
L73:
  mov    -0x74(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x88(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  movsd  -0x70(%rbp),%xmm1
  addsd  %xmm1,%xmm0
  movsd  %xmm0,-0x70(%rbp)
  mov    -0x74(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x90(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  movsd  -0x68(%rbp),%xmm1
  addsd  %xmm1,%xmm0
  movsd  %xmm0,-0x68(%rbp)
  mov    -0x74(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x90(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm1
  movsd  -0x58(%rbp),%xmm0
  comisd %xmm1,%xmm0
  jbe    L59
  mov    -0x74(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x90(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  movsd  %xmm0,-0x58(%rbp)
L59:
  mov    -0x74(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x90(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  comisd -0x50(%rbp),%xmm0
  jbe    L25
  mov    -0x74(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x90(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  movsd  %xmm0,-0x50(%rbp)
L25:
  addl   $0x1,-0x74(%rbp)
L75:
  mov    -0x74(%rbp),%eax
  cmp    -0x94(%rbp),%eax
  jl     L73
  pxor   %xmm0,%xmm0
  cvtsi2sdl -0x94(%rbp),%xmm0
  movsd  %xmm0,-0x30(%rbp)
  movsd  -0x70(%rbp),%xmm0
  divsd  -0x30(%rbp),%xmm0
  movsd  %xmm0,-0x28(%rbp)
  movsd  -0x68(%rbp),%xmm0
  divsd  -0x30(%rbp),%xmm0
  mov    0x18(%rbp),%rax
  movsd  %xmm0,(%rax)
  mov    0x18(%rbp),%rax
  movsd  (%rax),%xmm0
  movsd  %xmm0,-0x20(%rbp)
  mov    -0xb0(%rbp),%rax
  movsd  -0x58(%rbp),%xmm0
  movsd  %xmm0,(%rax)
  mov    0x10(%rbp),%rax
  movsd  -0x50(%rbp),%xmm0
  movsd  %xmm0,(%rax)
  movl   $0x0,-0x74(%rbp)
  jmp    L66
L35:
  mov    -0x74(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x88(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  subsd  -0x28(%rbp),%xmm0
  movsd  %xmm0,-0x8(%rbp)
  movsd  -0x8(%rbp),%xmm0
  mulsd  %xmm0,%xmm0
  movsd  -0x60(%rbp),%xmm1
  addsd  %xmm1,%xmm0
  movsd  %xmm0,-0x60(%rbp)
  mov    -0xa8(%rbp),%rax
  movsd  (%rax),%xmm1
  mov    -0x74(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x90(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  mulsd  -0x8(%rbp),%xmm0
  addsd  %xmm1,%xmm0
  mov    -0xa8(%rbp),%rax
  movsd  %xmm0,(%rax)
  addl   $0x1,-0x74(%rbp)
L66:
  mov    -0x74(%rbp),%eax
  cmp    -0x94(%rbp),%eax
  jl     L35
  mov    -0xa8(%rbp),%rax
  movsd  (%rax),%xmm0
  divsd  -0x60(%rbp),%xmm0
  mov    -0xa8(%rbp),%rax
  movsd  %xmm0,(%rax)
  mov    -0xa8(%rbp),%rax
  movsd  (%rax),%xmm0
  movapd %xmm0,%xmm1
  mulsd  -0x70(%rbp),%xmm1
  movsd  -0x68(%rbp),%xmm0
  subsd  %xmm1,%xmm0
  divsd  -0x30(%rbp),%xmm0
  mov    -0xa0(%rbp),%rax
  movsd  %xmm0,(%rax)
  pxor   %xmm0,%xmm0
  movsd  %xmm0,-0x48(%rbp)
  pxor   %xmm0,%xmm0
  movsd  %xmm0,-0x40(%rbp)
  pxor   %xmm0,%xmm0
  movsd  %xmm0,-0x38(%rbp)
  movl   $0x0,-0x74(%rbp)
  jmp    L11
L42:
  mov    -0x74(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x88(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  subsd  -0x28(%rbp),%xmm0
  movsd  %xmm0,-0x18(%rbp)
  mov    -0x74(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x90(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  subsd  -0x20(%rbp),%xmm0
  movsd  %xmm0,-0x10(%rbp)
  movsd  -0x18(%rbp),%xmm0
  mulsd  -0x10(%rbp),%xmm0
  movsd  -0x48(%rbp),%xmm1
  addsd  %xmm1,%xmm0
  movsd  %xmm0,-0x48(%rbp)
  movsd  -0x18(%rbp),%xmm0
  mulsd  %xmm0,%xmm0
  movsd  -0x40(%rbp),%xmm1
  addsd  %xmm1,%xmm0
  movsd  %xmm0,-0x40(%rbp)
  movsd  -0x10(%rbp),%xmm0
  mulsd  %xmm0,%xmm0
  movsd  -0x38(%rbp),%xmm1
  addsd  %xmm1,%xmm0
  movsd  %xmm0,-0x38(%rbp)
  addl   $0x1,-0x74(%rbp)
L11:
  mov    -0x74(%rbp),%eax
  cmp    -0x94(%rbp),%eax
  jl     L42
  mov    -0x40(%rbp),%rax
  movq   %rax,%xmm0
  call   <sqrt@plt>
  movsd  %xmm0,-0xb8(%rbp)
  mov    -0x38(%rbp),%rax
  movq   %rax,%xmm0
  call   <sqrt@plt>
  movsd  -0xb8(%rbp),%xmm1
  mulsd  %xmm0,%xmm1
  movsd  -0x48(%rbp),%xmm0
  divsd  %xmm1,%xmm0
  mov    0x20(%rbp),%rax
  movsd  %xmm0,(%rax)
  nop
  leave
  ret
```

assistant: ```c
void linreg(double *x, double *y, int nitems, double *a, double *b, double *minp, double *maxp, double *meanp, double *r) {
  double sx = 0.0;
  double sy = 0.0;
  double st2 = 0.0;
  double min = y[0];
  double max = 0.0;
  double ss, meanx, meany, t;
  double errx, erry, prodsum, sqerrx, sqerry;
  int i;
  *b = 0.0;
  for (i = 0; i < nitems; i++) {
    sx += x[i];
    sy += y[i];
    if (y[i] < min)
      min = y[i];
    if (y[i] > max)
      max = y[i];
  }
  ss = nitems;
  meanx = sx / ss;
  meany = *meanp = sy / ss;
  *minp = min;
  *maxp = max;
  for (i = 0; i < nitems; i++) {
    t = x[i] - meanx;
    st2 += t * t;
    *b += t * y[i];
  }
  *b /= st2;
  *a = (sy - sx * (*b)) / ss;
  prodsum = 0.0;
  sqerrx = 0.0;
  sqerry = 0.0;
  for (i = 0; i < nitems; i++) {
    errx = x[i] - meanx;
    erry = y[i] - meany;
    prodsum += errx * erry;
    sqerrx += errx * errx;
    sqerry += erry * erry;
  }
  *r = prodsum / (sqrt(sqerrx) * sqrt(sqerry));
}
```