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

```asm
<slfit>:
  endbr64
  push   %r15
  mov    %r9d,%r15d
  push   %r14
  mov    %rdx,%r14
  push   %r13
  push   %r12
  mov    %rdi,%r12
  push   %rbp
  push   %rbx
  mov    %ecx,%ebx
  sub    $0x18,%rsp
  mov    0x58(%rsp),%r13
  mov    0x50(%rsp),%rbp
  movl   $0x0,0x0(%r13)
  test   %ecx,%ecx
  jle    L243
  movss  D83(%rip),%xmm2
  lea    -0x1(%rcx),%edi
  xor    %eax,%eax
  mov    %ecx,%ecx
  cs nopw 0x0(%rax,%rax,1)
L15:
  movss  (%rsi,%rax,4),%xmm0
  movss  %xmm0,(%r14,%rax,4)
  movss  (%r8,%rax,4),%xmm1
  ucomiss D21(%rip),%xmm1
  jp     L276
  jne    L276
  mulss  %xmm2,%xmm0
  xor    %r15d,%r15d
  movss  %xmm0,(%r14,%rax,4)
L276:
  add    $0x1,%rax
  cmp    %rax,%rcx
  jne    L15
  test   %r15d,%r15d
  je     L203
  cmp    $0x2,%edi
  jbe    L86
  mov    %ebx,%esi
  pxor   %xmm3,%xmm3
  movaps D30(%rip),%xmm5
  xor    %eax,%eax
  shr    $0x2,%esi
  movaps %xmm3,%xmm0
  movaps %xmm3,%xmm1
  shl    $0x4,%rsi
L156:
  movups (%r8,%rax,1),%xmm2
  movaps %xmm5,%xmm4
  mulps  %xmm2,%xmm2
  divps  %xmm2,%xmm4
  addss  %xmm4,%xmm3
  movaps %xmm4,%xmm2
  shufps $0x55,%xmm4,%xmm2
  addss  %xmm3,%xmm2
  movaps %xmm4,%xmm3
  unpckhps %xmm4,%xmm3
  addss  %xmm2,%xmm3
  movaps %xmm4,%xmm2
  shufps $0xff,%xmm4,%xmm2
  addss  %xmm2,%xmm3
  movups (%r12,%rax,1),%xmm2
  mulps  %xmm4,%xmm2
  addss  %xmm2,%xmm1
  movaps %xmm2,%xmm6
  shufps $0x55,%xmm2,%xmm6
  addss  %xmm1,%xmm6
  movaps %xmm2,%xmm1
  unpckhps %xmm2,%xmm1
  shufps $0xff,%xmm2,%xmm2
  addss  %xmm6,%xmm1
  addss  %xmm2,%xmm1
  movups (%r14,%rax,1),%xmm2
  add    $0x10,%rax
  mulps  %xmm4,%xmm2
  addss  %xmm2,%xmm0
  movaps %xmm2,%xmm4
  shufps $0x55,%xmm2,%xmm4
  addss  %xmm0,%xmm4
  movaps %xmm2,%xmm0
  unpckhps %xmm2,%xmm0
  shufps $0xff,%xmm2,%xmm2
  addss  %xmm4,%xmm0
  addss  %xmm2,%xmm0
  cmp    %rax,%rsi
  jne    L156
  movss  D30(%rip),%xmm8
  mov    %ebx,%eax
  and    $0xfffffffc,%eax
  cmp    %eax,%ebx
  je     L153
L33:
  movss  D30(%rip),%xmm8
  movslq %eax,%rdi
  movss  (%r8,%rdi,4),%xmm2
  lea    0x0(,%rdi,4),%rsi
  movaps %xmm2,%xmm4
  mulss  %xmm2,%xmm4
  movaps %xmm8,%xmm2
  divss  %xmm4,%xmm2
  movss  (%r12,%rdi,4),%xmm4
  addss  %xmm2,%xmm3
  mulss  %xmm2,%xmm4
  mulss  (%r14,%rdi,4),%xmm2
  lea    0x1(%rax),%edi
  addss  %xmm4,%xmm1
  addss  %xmm2,%xmm0
  cmp    %ebx,%edi
  jge    L153
  movss  0x4(%r8,%rsi,1),%xmm2
  add    $0x2,%eax
  movaps %xmm2,%xmm4
  mulss  %xmm2,%xmm4
  movaps %xmm8,%xmm2
  divss  %xmm4,%xmm2
  movss  0x4(%r12,%rsi,1),%xmm4
  addss  %xmm2,%xmm3
  mulss  %xmm2,%xmm4
  mulss  0x4(%r14,%rsi,1),%xmm2
  addss  %xmm4,%xmm1
  addss  %xmm2,%xmm0
  cmp    %eax,%ebx
  jle    L153
  movss  0x8(%r8,%rsi,1),%xmm2
  movaps %xmm2,%xmm4
  mulss  %xmm2,%xmm4
  movaps %xmm8,%xmm2
  divss  %xmm4,%xmm2
  movss  0x8(%r12,%rsi,1),%xmm4
  addss  %xmm2,%xmm3
  mulss  %xmm2,%xmm4
  mulss  0x8(%r14,%rsi,1),%xmm2
  addss  %xmm4,%xmm1
  addss  %xmm2,%xmm0
L153:
  movaps %xmm1,%xmm9
  movss  0x0(%r13),%xmm4
  xor    %eax,%eax
  pxor   %xmm6,%xmm6
  divss  %xmm3,%xmm9
  nopw   0x0(%rax,%rax,1)
L37:
  movss  (%r12,%rax,4),%xmm2
  movss  (%r8,%rax,4),%xmm7
  movss  (%r14,%rax,4),%xmm5
  add    $0x1,%rax
  subss  %xmm9,%xmm2
  divss  %xmm7,%xmm5
  divss  %xmm7,%xmm2
  mulss  %xmm2,%xmm5
  mulss  %xmm2,%xmm2
  addss  %xmm5,%xmm4
  addss  %xmm2,%xmm6
  movss  %xmm4,0x0(%r13)
  cmp    %rax,%rcx
  jne    L37
  movaps %xmm1,%xmm2
  movaps %xmm6,%xmm7
  pxor   %xmm5,%xmm5
  mulss  %xmm1,%xmm2
  cvtss2sd %xmm3,%xmm5
  mulss  %xmm3,%xmm7
L212:
  divss  %xmm6,%xmm4
  movss  %xmm8,0xc(%rsp)
  movss  %xmm6,(%rsp)
  divss  %xmm7,%xmm2
  movss  %xmm4,0x0(%r13)
  mulss  %xmm1,%xmm4
  subss  %xmm4,%xmm0
  divss  %xmm3,%xmm0
  movss  %xmm0,0x0(%rbp)
  pxor   %xmm0,%xmm0
  cvtss2sd %xmm2,%xmm0
  addsd  D2(%rip),%xmm0
  divsd  %xmm5,%xmm0
  cvtsd2ss %xmm0,%xmm0
  call   <sqrt@plt>
  mov    0x60(%rsp),%rax
  movss  0xc(%rsp),%xmm8
  movss  (%rsp),%xmm6
  movss  %xmm0,(%rax)
  movaps %xmm8,%xmm0
  divss  %xmm6,%xmm0
  call   <sqrt@plt>
  mov    0x68(%rsp),%rax
  movss  %xmm0,(%rax)
  test   %r15d,%r15d
  jne    L175
  test   %ebx,%ebx
  jle    L80
  movslq %ebx,%rax
  xor    %r15d,%r15d
  pxor   %xmm0,%xmm0
  mov    %rax,(%rsp)
  cs nopw 0x0(%rax,%rax,1)
L112:
  movss  0x0(%r13),%xmm2
  mulss  (%r12,%r15,4),%xmm2
  mov    $0x2,%edi
  movss  (%r14,%r15,4),%xmm1
  subss  0x0(%rbp),%xmm1
  add    $0x1,%r15
  subss  %xmm2,%xmm1
  addss  %xmm1,%xmm0
  call   <pow@plt>
  cmp    (%rsp),%r15
  jne    L112
  pxor   %xmm1,%xmm1
  cmp    $0x2,%ebx
  jle    L131
  sub    $0x2,%ebx
  pxor   %xmm1,%xmm1
  cvtsi2ss %ebx,%xmm1
  divss  %xmm1,%xmm0
  call   <sqrt@plt>
  movaps %xmm0,%xmm1
L131:
  mov    0x60(%rsp),%rax
  movss  (%rax),%xmm0
  mulss  %xmm1,%xmm0
  movss  %xmm0,(%rax)
  mov    0x68(%rsp),%rax
  mulss  (%rax),%xmm1
  movss  %xmm1,(%rax)
L175:
  add    $0x18,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L203:
  pxor   %xmm3,%xmm3
  pxor   %xmm5,%xmm5
  movss  0x0(%r13),%xmm4
  cvtsi2ss %ebx,%xmm3
  cvtss2sd %xmm3,%xmm5
  cmp    $0x2,%edi
  jbe    L115
  mov    %ebx,%esi
  pxor   %xmm0,%xmm0
  xor    %eax,%eax
  shr    $0x2,%esi
  movaps %xmm0,%xmm1
  shl    $0x4,%rsi
  nopl   0x0(%rax)
L125:
  movups (%r12,%rax,1),%xmm2
  addss  %xmm2,%xmm1
  movaps %xmm2,%xmm6
  shufps $0x55,%xmm2,%xmm6
  addss  %xmm1,%xmm6
  movaps %xmm2,%xmm1
  unpckhps %xmm2,%xmm1
  shufps $0xff,%xmm2,%xmm2
  addss  %xmm6,%xmm1
  addss  %xmm2,%xmm1
  movups (%r14,%rax,1),%xmm2
  add    $0x10,%rax
  addss  %xmm2,%xmm0
  movaps %xmm2,%xmm6
  shufps $0x55,%xmm2,%xmm6
  addss  %xmm0,%xmm6
  movaps %xmm2,%xmm0
  unpckhps %xmm2,%xmm0
  shufps $0xff,%xmm2,%xmm2
  addss  %xmm6,%xmm0
  addss  %xmm2,%xmm0
  cmp    %rax,%rsi
  jne    L125
  mov    %ebx,%eax
  and    $0xfffffffc,%eax
  test   $0x3,%bl
  je     L154
L96:
  movslq %eax,%rdi
  addss  (%r12,%rdi,4),%xmm1
  addss  (%r14,%rdi,4),%xmm0
  lea    0x0(,%rdi,4),%rsi
  lea    0x1(%rax),%edi
  cmp    %edi,%ebx
  jle    L154
  add    $0x2,%eax
  addss  0x4(%r12,%rsi,1),%xmm1
  addss  0x4(%r14,%rsi,1),%xmm0
  cmp    %eax,%ebx
  jle    L154
  addss  0x8(%r12,%rsi,1),%xmm1
  addss  0x8(%r14,%rsi,1),%xmm0
L154:
  movaps %xmm1,%xmm8
  xor    %eax,%eax
  pxor   %xmm6,%xmm6
  divss  %xmm3,%xmm8
  nopw   0x0(%rax,%rax,1)
L170:
  movss  (%r12,%rax,4),%xmm2
  subss  %xmm8,%xmm2
  movaps %xmm2,%xmm7
  mulss  %xmm2,%xmm7
  mulss  (%r14,%rax,4),%xmm2
  add    $0x1,%rax
  addss  %xmm7,%xmm6
  addss  %xmm2,%xmm4
  movss  %xmm4,0x0(%r13)
  cmp    %rax,%rcx
  jne    L170
  movss  D30(%rip),%xmm8
  movaps %xmm1,%xmm2
  movaps %xmm6,%xmm7
  mulss  %xmm1,%xmm2
  mulss  %xmm3,%xmm7
  jmp    L212
  nopl   0x0(%rax,%rax,1)
L243:
  test   %r9d,%r9d
  je     L54
  pxor   %xmm7,%xmm7
  pxor   %xmm5,%xmm5
  movss  D30(%rip),%xmm8
  movaps %xmm7,%xmm2
  movaps %xmm7,%xmm4
  movaps %xmm7,%xmm3
  movaps %xmm7,%xmm0
  movaps %xmm7,%xmm1
  movaps %xmm7,%xmm6
  jmp    L212
L80:
  pxor   %xmm1,%xmm1
  jmp    L131
L54:
  pxor   %xmm3,%xmm3
  pxor   %xmm2,%xmm2
  pxor   %xmm5,%xmm5
  movss  D30(%rip),%xmm8
  cvtsi2ss %ecx,%xmm3
  pxor   %xmm7,%xmm7
  movaps %xmm2,%xmm4
  movaps %xmm2,%xmm0
  movaps %xmm2,%xmm1
  movaps %xmm2,%xmm6
  mulss  %xmm3,%xmm7
  cvtss2sd %xmm3,%xmm5
  jmp    L212
L86:
  pxor   %xmm3,%xmm3
  xor    %eax,%eax
  movaps %xmm3,%xmm0
  movaps %xmm3,%xmm1
  jmp    L33
L115:
  pxor   %xmm0,%xmm0
  xor    %eax,%eax
  movaps %xmm0,%xmm1
  jmp    L96
```

tool_calls: name: unpack_data
arguments: data_label: D83
type_guessed: f32
name: unpack_data
arguments: data_label: D21
type_guessed: byte[4]
name: unpack_data
arguments: data_label: D30
type_guessed: f32[4]
name: unpack_data
arguments: data_label: D2
type_guessed: f32[2]

tool: D83: 0.75

tool: {"D21": [0x00,0xc0,0x79,0xc4]}

tool: {"D30": [1.0,1.0,1.0,1.0]}

tool: {"D2": [0.0,1.875]}

assistant: ```c
void slfit(float *x, float *y, float *z, int ndata, float *sig, int weight, float *a, float *b, float *siga, float *sigb) {
  float sx = .0f;
  float sy = .0f;
  float st2 = .0f;
  float ss = .0f;
  *b = .0f;
  int q = 0;
  float sigdat = 0.0f;
  float t = 0.0f;
  float wt = 0.0f;
  float chi2 = 0.0f;
  float sxoss = 0.0f;
  int useweight = weight;
  int i = 0;
  for (i = 0; i < ndata; i++) {
    *(z + i) = *(y + i);
    if (*(sig + i) == -999.0) {
      useweight = 0;
      *(z + i) = 0.75 * (*(y + i));
    }
  }
  if (useweight) {
    for (i = 0; i < ndata; i++) {
      wt = 1.0 / (*(sig + i) * (*(sig + i)));
      ss = ss + wt;
      sx = sx + *(x + i) * wt;
      sy = sy + *(z + i) * wt;
    }
  } else {
    for (i = 0; i < ndata; i++) {
      sx = sx + *(x + i);
      sy = sy + *(z + i);
    }
    ss = (float)ndata;
  }
  sxoss = sx / ss;
  if (useweight) {
    for (i = 0; i < ndata; i++) {
      t = (*(x + i) - sxoss) / *(sig + i);
      *b = *b + t * (*(z + i) / *(sig + i));
      st2 = st2 + t * t;
    }
  } else {
    for (i = 0; i < ndata; i++) {
      t = (*(x + i) - sxoss);
      st2 = st2 + t * t;
      *b = *b + t * (*(z + i));
    }
  }
  *b = *b / st2;
  *a = (sy - sx * (*b)) / ss;
  *siga = sqrt((1.0 + sx * sx / (ss * st2)) / ss);
  *sigb = sqrt(1.0 / st2);
  chi2 = 0.0;
  if (!useweight) {
    for (i = 0; i < ndata; i++) {
      chi2 = pow((chi2 + ((*(z + i)) - *a - *b * (*(x + i)))), 2);
    }
    q = 1;
    sigdat = 0.0f;
    if (ndata > 2)
      sigdat = sqrt(chi2 / (ndata - 2));
    *siga = *siga * sigdat;
    *sigb = *sigb * sigdat;
  }
}
```