user: What is the c source code of the assembly code below?

```asm
<z2x2>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  sub    $0x70,%rsp
  mov    %rdi,-0x68(%rbp)
  pxor   %xmm0,%xmm0
  movsd  %xmm0,-0x40(%rbp)
  pxor   %xmm0,%xmm0
  movsd  %xmm0,-0x38(%rbp)
  movl   $0x2,-0x4c(%rbp)
  movl   $0x2,-0x48(%rbp)
  mov    -0x4c(%rbp),%eax
  mov    $0x8,%esi
  mov    %eax,%edi
  call   <calloc@plt>
  mov    %rax,-0x20(%rbp)
  cmpq   $0x0,-0x20(%rbp)
  jne    L47
  mov    -0x4c(%rbp),%eax
  mov    %eax,%esi
  lea    D51(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <fatalx@plt>
L47:
  mov    -0x48(%rbp),%eax
  mov    $0x8,%esi
  mov    %eax,%edi
  call   <calloc@plt>
  mov    %rax,-0x18(%rbp)
  cmpq   $0x0,-0x18(%rbp)
  jne    L89
  mov    -0x48(%rbp),%eax
  mov    %eax,%esi
  lea    D51(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <fatalx@plt>
L89:
  movl   $0x0,-0x54(%rbp)
  jmp    L66
L9:
  movl   $0x0,-0x50(%rbp)
  jmp    L29
L123:
  mov    -0x54(%rbp),%eax
  imul   -0x48(%rbp),%eax
  mov    %eax,%edx
  mov    -0x50(%rbp),%eax
  add    %edx,%eax
  mov    %eax,-0x44(%rbp)
  mov    -0x54(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x20(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm1
  mov    -0x44(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x68(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  mov    -0x54(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x20(%rbp),%rax
  add    %rdx,%rax
  addsd  %xmm1,%xmm0
  movsd  %xmm0,(%rax)
  mov    -0x50(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm1
  mov    -0x44(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x68(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  mov    -0x50(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  addsd  %xmm1,%xmm0
  movsd  %xmm0,(%rax)
  mov    -0x44(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x68(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  movsd  -0x40(%rbp),%xmm1
  addsd  %xmm1,%xmm0
  movsd  %xmm0,-0x40(%rbp)
  addl   $0x1,-0x50(%rbp)
L29:
  mov    -0x50(%rbp),%eax
  cmp    -0x48(%rbp),%eax
  jl     L123
  addl   $0x1,-0x54(%rbp)
L66:
  mov    -0x54(%rbp),%eax
  cmp    -0x4c(%rbp),%eax
  jl     L9
  movsd  D41(%rip),%xmm0
  comisd -0x40(%rbp),%xmm0
  jbe    L13
  lea    D70(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <fatalx@plt>
L13:
  movl   $0x0,-0x54(%rbp)
  jmp    L105
L28:
  movl   $0x0,-0x50(%rbp)
  jmp    L69
L50:
  mov    -0x54(%rbp),%eax
  imul   -0x48(%rbp),%eax
  mov    %eax,%edx
  mov    -0x50(%rbp),%eax
  add    %edx,%eax
  mov    %eax,-0x44(%rbp)
  mov    -0x54(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x20(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm1
  mov    -0x50(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x18(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  mulsd  %xmm1,%xmm0
  divsd  -0x40(%rbp),%xmm0
  movsd  %xmm0,-0x10(%rbp)
  movsd  D15(%rip),%xmm0
  comisd -0x10(%rbp),%xmm0
  jbe    L48
  lea    D80(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  mov    -0x48(%rbp),%edx
  mov    -0x4c(%rbp),%ecx
  mov    -0x68(%rbp),%rax
  mov    %ecx,%esi
  mov    %rax,%rdi
  call   <printmat@plt>
  lea    D8(%rip),%rax
  mov    %rax,%rdi
  mov    $0x0,%eax
  call   <fatalx@plt>
L48:
  mov    -0x44(%rbp),%eax
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    -0x68(%rbp),%rax
  add    %rdx,%rax
  movsd  (%rax),%xmm0
  subsd  -0x10(%rbp),%xmm0
  movsd  %xmm0,-0x8(%rbp)
  cmpl   $0x0,-0x44(%rbp)
  jne    L25
  movsd  -0x8(%rbp),%xmm0
  movsd  %xmm0,-0x30(%rbp)
L25:
  movsd  -0x8(%rbp),%xmm0
  mulsd  %xmm0,%xmm0
  divsd  -0x10(%rbp),%xmm0
  movsd  -0x38(%rbp),%xmm1
  addsd  %xmm1,%xmm0
  movsd  %xmm0,-0x38(%rbp)
  addl   $0x1,-0x50(%rbp)
L69:
  mov    -0x50(%rbp),%eax
  cmp    -0x48(%rbp),%eax
  jl     L50
  addl   $0x1,-0x54(%rbp)
L105:
  mov    -0x54(%rbp),%eax
  cmp    -0x4c(%rbp),%eax
  jl     L28
  movsd  -0x38(%rbp),%xmm1
  movsd  D15(%rip),%xmm0
  addsd  %xmm0,%xmm1
  movq   %xmm1,%rax
  movq   %rax,%xmm0
  call   <sqrt@plt>
  movq   %xmm0,%rax
  mov    %rax,-0x28(%rbp)
  pxor   %xmm0,%xmm0
  comisd -0x30(%rbp),%xmm0
  jbe    L103
  movsd  -0x28(%rbp),%xmm0
  movq   D23(%rip),%xmm1
  xorpd  %xmm1,%xmm0
  movsd  %xmm0,-0x28(%rbp)
L103:
  mov    -0x20(%rbp),%rax
  mov    %rax,%rdi
  call   <free@plt>
  mov    -0x18(%rbp),%rax
  mov    %rax,%rdi
  call   <free@plt>
  movsd  -0x28(%rbp),%xmm0
  movq   %xmm0,%rax
  movq   %rax,%xmm0
  leave
  ret
```

tool_calls: name: disassemble_data
arguments: tag: D51
type_guessed: string
name: disassemble_data
arguments: tag: D41
type_guessed: f64
name: disassemble_data
arguments: tag: D70
type_guessed: string
name: disassemble_data
arguments: tag: D15
type_guessed: byte[8]
name: disassemble_data
arguments: tag: D80
type_guessed: string
name: disassemble_data
arguments: tag: D8
type_guessed: string
name: disassemble_data
arguments: tag: D23
type_guessed: f32[2]

tool: D51: Unable to allocate %d unit(s) for item 


tool: D41: 0.001

tool: D70: (z2x2) no data


tool: {"D15": [0x11,0xea,0x2d,0x81,0x99,0x97,0x71,0x3d]}

tool: D80: bad conchi


tool: D8: (conchi) zero row or column sum


tool: {"D23": [0.0,-0.0]}

assistant: ```c
double z2x2(double *a) {
  double *rsum, *csum, ee, tot = 0, chsq = 0, y, dev00, z;
  int i, j, k, m = 2, n = 2;
  if ((rsum = (double *)calloc((m), sizeof(double))) == NULL)
    fatalx("Unable to allocate %d unit(s) for item \n", m);
  if ((csum = (double *)calloc((n), sizeof(double))) == NULL)
    fatalx("Unable to allocate %d unit(s) for item \n", n);
  for (i = 0; i < m; i++) {
    for (j = 0; j < n; j++) {
      k = i * n + j;
      rsum[i] += a[k];
      csum[j] += a[k];
      tot += a[k];
    }
  }
  if (tot < 0.001)
    fatalx("(z2x2) no data\n");
  for (i = 0; i < m; i++) {
    for (j = 0; j < n; j++) {
      k = i * n + j;
      ee = rsum[i] * csum[j] / tot;
      if (ee < 1.0e-12) {
        printf("bad conchi\n");
        printmat(a, m, n);
        fatalx("(conchi) zero row or column sum\n");
      }
      y = a[k] - ee;
      if (k == 0)
        dev00 = y;
      chsq += (y * y) / ee;
    }
  }
  z = sqrt(chsq + 1.0e-12);
  if (dev00 < 0.0)
    z = -z;
  free(rsum);
  free(csum);
  return z;
}
```