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

```asm
<_update>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x68,%rsp
  mov    %rsi,0x20(%rsp)
  mov    %ecx,0xc(%rsp)
  mov    %r8d,0x5c(%rsp)
  test   %r8d,%r8d
  jle    L122
  movslq %ecx,%rax
  shl    $0x3,%rax
  mov    %rax,0x10(%rsp)
  movl   $0x0,0x58(%rsp)
  mov    %rdi,%r13
  mov    %rdx,%r15
  jmp    L100
L86:
  mov    0x30(%rsp),%rax
  movsd  (%rax),%xmm0
  call   <is_positive@plt>
  test   %rax,%rax
  jne    L4
L3:
  add    $0x1,%r12d
  add    $0x8,%rbx
  add    0x10(%rsp),%rbp
  cmp    %r14d,%r12d
  jg     L43
L55:
  movsd  0x0(%r13,%rbx,1),%xmm0
  addsd  0x0(%r13,%rbp,1),%xmm0
  comisd D16(%rip),%xmm0
  jbe    L3
  cmp    %r14d,%r12d
  je     L86
  mov    0x38(%rsp),%edx
  mov    0xc(%rsp),%esi
  mov    %r15,%rdi
  call   <_sum_row@plt>
  subsd  (%r15,%rbx,1),%xmm0
  movsd  %xmm0,0x18(%rsp)
  mov    %r12d,%edx
  mov    0xc(%rsp),%esi
  mov    %r15,%rdi
  call   <_sum_row@plt>
  movapd %xmm0,%xmm2
  movsd  0x0(%r13,%rbx,1),%xmm3
  movsd  (%r15,%rbx,1),%xmm0
  mov    $0x1,%edi
  mov    0x28(%rsp),%rax
  movsd  (%rax,%rbx,1),%xmm5
  mov    0x20(%rsp),%rax
  mov    (%rsp),%rcx
  movsd  (%rax,%rcx,8),%xmm4
  addsd  0x0(%r13,%rbp,1),%xmm3
  subsd  (%r15,%rbp,1),%xmm2
  movsd  0x18(%rsp),%xmm1
  call   <_update_step@plt>
  movsd  %xmm0,(%r15,%rbx,1)
  movsd  %xmm0,(%r15,%rbp,1)
  jmp    L3
L4:
  mov    0x20(%rsp),%rax
  mov    (%rsp),%rdx
  movsd  (%rax,%rdx,8),%xmm0
  mov    0x30(%rsp),%rax
  subsd  (%rax),%xmm0
  call   <is_positive@plt>
  test   %rax,%rax
  je     L3
  mov    0x30(%rsp),%rax
  movsd  (%rax),%xmm0
  mov    0x20(%rsp),%rax
  mov    (%rsp),%rdx
  movsd  (%rax,%rdx,8),%xmm1
  subsd  %xmm0,%xmm1
  call   <genbet@plt>
  movsd  D15(%rip),%xmm1
  subsd  %xmm0,%xmm1
  divsd  %xmm1,%xmm0
  movsd  %xmm0,0x18(%rsp)
  mov    0x38(%rsp),%edx
  mov    0xc(%rsp),%esi
  mov    %r15,%rdi
  call   <_sum_row@plt>
  mov    0x50(%rsp),%rax
  subsd  (%rax),%xmm0
  mulsd  0x18(%rsp),%xmm0
  movsd  %xmm0,0x18(%rsp)
  call   <is_positive@plt>
  test   %rax,%rax
  je     L3
  mov    0x50(%rsp),%rax
  movsd  0x18(%rsp),%xmm7
  movsd  %xmm7,(%rax)
  jmp    L3
L43:
  addq   $0x1,(%rsp)
  mov    (%rsp),%rax
  mov    0xc(%rsp),%esi
  add    %esi,0x3c(%rsp)
  mov    0x44(%rsp),%esi
  add    %esi,0x40(%rsp)
  cmp    0x48(%rsp),%rax
  je     L96
L131:
  mov    (%rsp),%rax
  mov    %eax,0x38(%rsp)
  mov    %eax,%r14d
  test   %eax,%eax
  js     L43
  movslq 0x40(%rsp),%rax
  shl    $0x3,%rax
  lea    0x0(%r13,%rax,1),%rdi
  mov    %rdi,0x30(%rsp)
  add    %r15,%rax
  mov    %rax,0x50(%rsp)
  movslq 0x3c(%rsp),%rax
  lea    0x0(,%rax,8),%rbx
  mov    (%rsp),%rsi
  lea    0x0(,%rsi,8),%rbp
  neg    %rax
  mov    0x20(%rsp),%rcx
  lea    (%rcx,%rax,8),%rax
  mov    %rax,0x28(%rsp)
  mov    $0x0,%r12d
  jmp    L55
L96:
  mov    0xc(%rsp),%esi
  mov    %r15,%rdi
  call   <_normalize_all@plt>
  addl   $0x1,0x58(%rsp)
  mov    0x58(%rsp),%eax
  cmp    %eax,0x5c(%rsp)
  je     L122
L100:
  mov    0xc(%rsp),%eax
  test   %eax,%eax
  jle    L96
  lea    0x1(%rax),%edi
  mov    %edi,0x44(%rsp)
  mov    %eax,%eax
  mov    %rax,0x48(%rsp)
  movl   $0x0,0x40(%rsp)
  movl   $0x0,0x3c(%rsp)
  movq   $0x0,(%rsp)
  jmp    L131
L122:
  add    $0x68,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
```

tool_calls: name: retrieve_data
arguments: data_tag: D16
type: byte[16]
name: retrieve_data
arguments: data_tag: D15
type: byte[8]

tool: {"D16": [0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xf0,0x3f]}

tool: {"D15": [0x00,0x00,0x00,0x00,0x00,0x00,0xf0,0x3f]}

assistant: ```c
void _update(double *C, double *sumC, double *X, int n, int n_step) {
  int iter, i, j;
  double tmp1, tmp2;
  for (iter = 0; iter < n_step; iter++) {
    for (i = 0; i < n; i++) {
      for (j = 0; j <= i; j++) {
        if (C[i * n + j] + C[j * n + i] > 0) {
          if (i == j) {
            if (is_positive(C[i * n + i]) && is_positive(sumC[i] - C[i * n + i])) {
              tmp1 = genbet(C[i * n + i], sumC[i] - C[i * n + i]);
              tmp2 = tmp1 / (1 - tmp1) * (_sum_row(X, n, i) - X[i * n + i]);
              if (is_positive(tmp2)) {
                X[i * n + i] = tmp2;
              }
            }
          } else {
            tmp1 = _sum_row(X, n, i) - X[i * n + j];
            tmp2 = _sum_row(X, n, j) - X[j * n + i];
            X[i * n + j] = _update_step(X[i * n + j], tmp1, tmp2, C[i * n + j] + C[j * n + i], sumC[i], sumC[j], 1);
            X[j * n + i] = X[i * n + j];
          }
        }
      }
    }
    _normalize_all(X, n);
  }
}
```