user: What would the C source look like for the assembly code provided here:

```asm
<fit>:
  endbr64
  push   %r15
  mov    %rdi,%r15
  push   %r14
  push   %r13
  mov    %rsi,%r13
  push   %r12
  mov    %rcx,%r12
  push   %rbp
  mov    %r9,%rbp
  push   %rbx
  mov    %edx,%ebx
  sub    $0x38,%rsp
  mov    0x70(%rsp),%rax
  mov    %r8d,0x2c(%rsp)
  movq   $0x0,(%rax)
  test   %r8d,%r8d
  jne    L7
  pxor   %xmm6,%xmm6
  movsd  (%r9),%xmm1
  cvtsi2sd %edx,%xmm6
  test   %edx,%edx
  jle    L138
  cmp    $0x1,%edx
  je     L78
  shr    %edx
  pxor   %xmm2,%xmm2
  lea    -0x1(%rdx),%ecx
  movapd %xmm2,%xmm3
  mov    $0x8,%edx
  shl    $0x4,%rcx
  add    $0x18,%rcx
  nopw   0x0(%rax,%rax,1)
L65:
  movsd  (%r15,%rdx,1),%xmm0
  addsd  %xmm0,%xmm3
  movsd  0x8(%r15,%rdx,1),%xmm0
  addsd  %xmm0,%xmm3
  movsd  0x0(%r13,%rdx,1),%xmm0
  addsd  %xmm0,%xmm2
  movsd  0x8(%r13,%rdx,1),%xmm0
  add    $0x10,%rdx
  addsd  %xmm0,%xmm2
  cmp    %rdx,%rcx
  jne    L65
  mov    %ebx,%edx
  or     $0x1,%edx
  test   $0x1,%bl
  je     L223
L215:
  movslq %edx,%rdx
  addsd  (%r15,%rdx,8),%xmm3
  addsd  0x0(%r13,%rdx,8),%xmm2
L223:
  movapd %xmm3,%xmm11
  movapd %xmm2,%xmm10
  lea    0x1(%rbx),%ecx
  mov    $0x1,%edx
  divsd  %xmm6,%xmm11
  pxor   %xmm4,%xmm4
  movapd %xmm4,%xmm7
  divsd  %xmm6,%xmm10
  nopw   0x0(%rax,%rax,1)
L63:
  movsd  (%r15,%rdx,8),%xmm0
  movsd  0x0(%r13,%rdx,8),%xmm5
  add    $0x1,%rdx
  subsd  %xmm11,%xmm0
  movapd %xmm5,%xmm8
  subsd  %xmm10,%xmm8
  mulsd  %xmm0,%xmm5
  movapd %xmm0,%xmm9
  mulsd  %xmm0,%xmm9
  mulsd  %xmm8,%xmm8
  addsd  %xmm5,%xmm1
  addsd  %xmm9,%xmm7
  addsd  %xmm8,%xmm4
  movsd  %xmm1,0x0(%rbp)
  cmp    %rcx,%rdx
  jne    L63
  movsd  D16(%rip),%xmm12
  movapd %xmm3,%xmm0
  movapd %xmm7,%xmm5
  mulsd  %xmm3,%xmm0
  mulsd  %xmm6,%xmm5
  movsd  %xmm12,0x8(%rsp)
  jmp    L40
L7:
  test   %edx,%edx
  jle    L89
  movsd  D16(%rip),%xmm4
  pxor   %xmm6,%xmm6
  mov    $0x1,%r14d
  movapd %xmm6,%xmm2
  movapd %xmm6,%xmm3
  movsd  %xmm4,0x8(%rsp)
  nopl   0x0(%rax,%rax,1)
L179:
  cvttsd2si (%r12,%r14,8),%edi
  movsd  %xmm2,0x20(%rsp)
  movsd  %xmm3,0x18(%rsp)
  movsd  %xmm6,0x10(%rsp)
  call   <sqrt@plt>
  movsd  0x10(%rsp),%xmm6
  movsd  0x18(%rsp),%xmm3
  movapd %xmm0,%xmm1
  movsd  0x8(%rsp),%xmm0
  movsd  0x20(%rsp),%xmm2
  divsd  %xmm1,%xmm0
  movsd  (%r15,%r14,8),%xmm1
  addsd  %xmm0,%xmm6
  mulsd  %xmm0,%xmm1
  mulsd  0x0(%r13,%r14,8),%xmm0
  add    $0x1,%r14
  addsd  %xmm1,%xmm3
  addsd  %xmm0,%xmm2
  cmp    %r14d,%ebx
  jge    L179
  movapd %xmm3,%xmm8
  movsd  0x0(%rbp),%xmm1
  lea    0x1(%rbx),%ecx
  pxor   %xmm7,%xmm7
  divsd  %xmm6,%xmm8
  mov    $0x1,%edx
  xchg   %ax,%ax
L50:
  movsd  (%r15,%rdx,8),%xmm0
  movsd  (%r12,%rdx,8),%xmm4
  subsd  %xmm8,%xmm0
  divsd  %xmm4,%xmm0
  movapd %xmm0,%xmm5
  mulsd  %xmm0,%xmm5
  mulsd  0x0(%r13,%rdx,8),%xmm0
  add    $0x1,%rdx
  addsd  %xmm5,%xmm7
  divsd  %xmm4,%xmm0
  addsd  %xmm0,%xmm1
  movsd  %xmm1,0x0(%rbp)
  cmp    %rcx,%rdx
  jne    L50
  movapd %xmm3,%xmm0
  movapd %xmm6,%xmm5
  pxor   %xmm4,%xmm4
  mulsd  %xmm3,%xmm0
  mulsd  %xmm7,%xmm5
L40:
  divsd  %xmm7,%xmm1
  mov    0x70(%rsp),%rax
  movsd  %xmm4,0x18(%rsp)
  movsd  %xmm7,0x10(%rsp)
  divsd  %xmm5,%xmm0
  movsd  %xmm1,0x0(%rbp)
  mulsd  %xmm3,%xmm1
  subsd  %xmm1,%xmm2
  divsd  %xmm6,%xmm2
  addsd  0x8(%rsp),%xmm0
  divsd  %xmm6,%xmm0
  movsd  %xmm2,(%rax)
  cvttsd2si %xmm0,%edi
  call   <sqrt@plt>
  mov    0x80(%rsp),%rax
  movsd  0x10(%rsp),%xmm7
  movsd  %xmm0,(%rax)
  movsd  0x8(%rsp),%xmm0
  divsd  %xmm7,%xmm0
  cvttsd2si %xmm0,%edi
  call   <sqrt@plt>
  mov    0x78(%rsp),%rax
  movsd  %xmm0,(%rax)
  mov    0x98(%rsp),%rax
  movsd  0x8(%rsp),%xmm0
  movsd  %xmm0,(%rax)
  mov    0x90(%rsp),%rax
  movq   $0x0,(%rax)
  mov    0x2c(%rsp),%eax
  test   %eax,%eax
  jne    L16
  test   %ebx,%ebx
  movsd  0x18(%rsp),%xmm4
  pxor   %xmm1,%xmm1
  jle    L29
  mov    0x70(%rsp),%rax
  movsd  0x0(%rbp),%xmm3
  movsd  (%rax),%xmm5
  cmp    $0x1,%ebx
  je     L157
  movapd %xmm5,%xmm7
  movapd %xmm3,%xmm6
  pxor   %xmm1,%xmm1
  mov    %ebx,%edx
  shr    %edx
  unpcklpd %xmm7,%xmm7
  unpcklpd %xmm6,%xmm6
  lea    -0x1(%rdx),%ecx
  mov    $0x8,%edx
  shl    $0x4,%rcx
  add    $0x18,%rcx
  nop
L217:
  movupd (%r15,%rdx,1),%xmm2
  movupd 0x0(%r13,%rdx,1),%xmm0
  add    $0x10,%rdx
  mulpd  %xmm6,%xmm2
  subpd  %xmm7,%xmm0
  subpd  %xmm2,%xmm0
  mulpd  %xmm0,%xmm0
  movapd %xmm0,%xmm2
  unpckhpd %xmm0,%xmm0
  addsd  %xmm1,%xmm2
  movapd %xmm0,%xmm1
  addsd  %xmm2,%xmm1
  cmp    %rdx,%rcx
  jne    L217
  mov    %ebx,%edx
  or     $0x1,%edx
  test   $0x1,%bl
  je     L29
L82:
  movslq %edx,%rdx
  mulsd  (%r15,%rdx,8),%xmm3
  movsd  0x0(%r13,%rdx,8),%xmm0
  subsd  %xmm5,%xmm0
  subsd  %xmm3,%xmm0
  mulsd  %xmm0,%xmm0
  addsd  %xmm0,%xmm1
L29:
  lea    -0x2(%rbx),%eax
  pxor   %xmm2,%xmm2
  movapd %xmm1,%xmm0
  movsd  %xmm4,0x18(%rsp)
  cvtsi2sd %eax,%xmm2
  movsd  %xmm1,0x10(%rsp)
  divsd  %xmm2,%xmm0
  cvttsd2si %xmm0,%edi
  call   <sqrt@plt>
  mov    0x78(%rsp),%rax
  movsd  0x10(%rsp),%xmm1
  movsd  0x18(%rsp),%xmm4
  movsd  (%rax),%xmm2
  mulsd  %xmm0,%xmm2
  movsd  %xmm2,(%rax)
  movapd %xmm1,%xmm2
  mov    0x80(%rsp),%rax
  divsd  %xmm4,%xmm2
  mulsd  (%rax),%xmm0
  movsd  %xmm0,(%rax)
  movsd  0x8(%rsp),%xmm0
  subsd  %xmm2,%xmm0
  cvttsd2si %xmm0,%edi
  call   <sqrt@plt>
  mov    %ebx,%edi
  mov    0x88(%rsp),%rax
  shr    $0x1f,%edi
  movsd  %xmm0,0x8(%rsp)
  add    %ebx,%edi
  movsd  %xmm0,(%rax)
  sar    %edi
  call   <sqrt@plt>
  movsd  0x8(%rsp),%xmm2
  mulsd  %xmm2,%xmm0
  call   <erffc@plt>
  mov    0x90(%rsp),%rax
  movsd  0x10(%rsp),%xmm1
  movsd  %xmm0,(%rax)
L167:
  cmp    $0x2,%ebx
  jle    L27
  sub    $0x2,%ebx
  pxor   %xmm0,%xmm0
  movsd  D15(%rip),%xmm2
  cvtsi2sd %ebx,%xmm0
  mulsd  %xmm2,%xmm1
  mulsd  %xmm2,%xmm0
  call   <gammq@plt>
  mov    0x98(%rsp),%rax
  movsd  %xmm0,(%rax)
L27:
  add    $0x38,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
  nopl   (%rax)
L16:
  test   %ebx,%ebx
  jle    L27
  mov    $0x1,%r14d
  pxor   %xmm1,%xmm1
  cs nopw 0x0(%rax,%rax,1)
L189:
  mov    0x70(%rsp),%rax
  movsd  0x0(%r13,%r14,8),%xmm0
  movsd  %xmm1,0x8(%rsp)
  subsd  0x0(%rbp),%xmm0
  movsd  (%rax),%xmm2
  mulsd  (%r15,%r14,8),%xmm2
  subsd  %xmm2,%xmm0
  divsd  (%r12,%r14,8),%xmm0
  add    $0x1,%r14
  cvttsd2si %xmm0,%edi
  call   <sqrt@plt>
  movsd  0x8(%rsp),%xmm1
  addsd  %xmm0,%xmm1
  cmp    %r14d,%ebx
  jge    L189
  jmp    L167
  nopl   0x0(%rax)
L138:
  movsd  D16(%rip),%xmm14
  pxor   %xmm0,%xmm0
  pxor   %xmm5,%xmm5
  mulsd  %xmm6,%xmm5
  movapd %xmm0,%xmm2
  movapd %xmm0,%xmm3
  movapd %xmm0,%xmm4
  movapd %xmm0,%xmm7
  movsd  %xmm14,0x8(%rsp)
  jmp    L40
  nopl   0x0(%rax)
L89:
  movsd  D16(%rip),%xmm13
  pxor   %xmm5,%xmm5
  movsd  (%r9),%xmm1
  movapd %xmm5,%xmm0
  movapd %xmm5,%xmm6
  movapd %xmm5,%xmm2
  movapd %xmm5,%xmm3
  movapd %xmm5,%xmm4
  movapd %xmm5,%xmm7
  movsd  %xmm13,0x8(%rsp)
  jmp    L40
L78:
  pxor   %xmm2,%xmm2
  mov    $0x1,%edx
  movapd %xmm2,%xmm3
  jmp    L215
L157:
  mov    $0x1,%edx
  pxor   %xmm1,%xmm1
  jmp    L82
```

tool_calls: name: parse_data
arguments: tag: D16
type_guessed: f64
name: parse_data
arguments: tag: D15
type_guessed: f64

tool: D16: 1

tool: D15: 0.5

assistant: ```c
void fit(double x[], double y[], int ndata, double sig[], int mwt, double *a, double *b, double *siga, double *sigb, double *r2, double *epsilon, double *q) {
  double gammq(double a, double x);
  double erfcc(double x);
  double erffc(double x);
  int i;
  double wt, t, sxoss, syoss, sx = 0.0, sy = 0.0, st2 = 0.0, ss, sigdat, chi2;
  double u, su2 = 0.0;
  *b = 0.0;
  if (mwt) {
    ss = 0.0;
    for (i = 1; i <= ndata; i++) {
      wt = 1.0 / sqrt(sig[i]);
      ss += wt;
      sx += x[i] * wt;
      sy += y[i] * wt;
    }
  } else {
    for (i = 1; i <= ndata; i++) {
      sx += x[i];
      sy += y[i];
    }
    ss = ndata;
  }
  sxoss = sx / ss;
  syoss = sy / ss;
  if (mwt) {
    for (i = 1; i <= ndata; i++) {
      t = (x[i] - sxoss) / sig[i];
      st2 += t * t;
      *a += t * y[i] / sig[i];
    }
  } else {
    for (i = 1; i <= ndata; i++) {
      t = x[i] - sxoss;
      u = y[i] - syoss;
      st2 += t * t;
      su2 += u * u;
      *a += t * y[i];
    }
  }
  *a /= st2;
  *b = (sy - sx * (*a)) / ss;
  *sigb = sqrt((1.0 + sx * sx / (ss * st2)) / ss);
  *siga = sqrt(1.0 / st2);
  chi2 = 0.0;
  *q = 1.0;
  *epsilon = 0.0;
  if (mwt) {
    for (i = 1; i <= ndata; i++)
      chi2 += sqrt((y[i] - (*a) - (*b) * x[i]) / sig[i]);
  } else {
    for (i = 1; i <= ndata; i++) {
      t = (y[i] - (*b) - (*a) * x[i]);
      chi2 += t * t;
    }
    sigdat = sqrt((chi2) / (ndata - 2));
    *siga *= sigdat;
    *sigb *= sigdat;
    *r2 = sqrt(1 - chi2 / su2);
    *epsilon = erffc((*r2) * sqrt(ndata / 2));
  }
  if (ndata > 2)
    *q = gammq(0.5 * (ndata - 2), 0.5 * (chi2));
}
```