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

```asm
<main>:
  endbr64
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbp
  push   %rbx
  sub    $0x48,%rsp
  mov    %edi,%r12d
  mov    %rsi,%r13
  mov    %fs:0x28,%rax
  mov    %rax,0x38(%rsp)
  xor    %eax,%eax
  cmp    $0x1,%edi
  jg     L47
L139:
  cmp    $0x2,%r12d
  jg     L126
  mov    $0x8,%esi
  mov    $0x9c4,%edi
  call   <calloc@plt>
  mov    %rax,%r12
  mov    %rax,%r13
  mov    $0x8,%esi
  mov    $0x32,%edi
  call   <calloc@plt>
  mov    %rax,%r14
  mov    %rax,%r15
  mov    $0x8,%esi
  mov    $0x32,%edi
  call   <calloc@plt>
  mov    %rax,0x8(%rsp)
  mov    $0x32,%ebx
  mov    $0x1,%ebp
L68:
  lea    0x0(%rbp,%rbp,1),%eax
  pxor   %xmm0,%xmm0
  cvtsi2sd %eax,%xmm0
  movslq %ebx,%rax
  lea    0x8(,%rax,8),%rdx
  mov    $0x0,%eax
L11:
  movsd  %xmm0,(%r12)
  add    $0x1,%eax
  add    %rdx,%r12
  cmp    %ebx,%eax
  jne    L11
  mov    %ebx,%r8d
  mov    $0x0,%edi
  mov    $0x0,%esi
  movsd  D28(%rip),%xmm0
  jmp    L196
L47:
  mov    0x8(%rsi),%rdi
  call   <atoi@plt>
  mov    %eax,%ebx
  test   %eax,%eax
  js     L139
  mov    $0x1,%ebp
  cmp    $0x2,%r12d
  jg     L186
L144:
  cmp    %ebx,%ebp
  jl     L104
  pxor   %xmm0,%xmm0
  cvtsi2sd %ebx,%xmm0
  mov    %ebp,%esi
  lea    D10(%rip),%rdi
  mov    $0x1,%eax
  call   <printf@plt>
  mov    $0x1,%edi
  call   <exit@plt>
L104:
  mov    %ebx,%edi
  imul   %ebx,%edi
  mov    $0x8,%esi
  call   <calloc@plt>
  mov    %rax,%r12
  mov    %rax,%r13
  mov    $0x8,%esi
  mov    %ebx,%edi
  call   <calloc@plt>
  mov    %rax,%r14
  mov    %rax,%r15
  mov    $0x8,%esi
  mov    %ebx,%edi
  call   <calloc@plt>
  mov    %rax,0x8(%rsp)
  test   %ebx,%ebx
  jg     L68
  jmp    L69
L186:
  mov    0x10(%r13),%rdi
  call   <atoi@plt>
  mov    %eax,%ebp
  test   %eax,%eax
  jns    L144
  mov    $0x1,%ebp
  jmp    L144
L159:
  add    $0x1,%eax
  cmp    %ebx,%eax
  je     L117
L145:
  cmp    %eax,%esi
  je     L159
  mov    %esi,%ecx
  sub    %eax,%ecx
  mov    %ecx,%edx
  neg    %edx
  cmovs  %ecx,%edx
  cmp    %ebp,%edx
  jg     L159
  lea    (%rax,%rdi,1),%edx
  movslq %edx,%rdx
  movsd  %xmm0,0x0(%r13,%rdx,8)
  jmp    L159
L117:
  add    $0x1,%esi
  add    %r8d,%edi
  cmp    %ebx,%esi
  je     L146
L196:
  mov    $0x0,%eax
  jmp    L145
L146:
  mov    %r14,%rax
  lea    -0x1(%r8),%edx
  lea    0x8(%r14,%rdx,8),%rdx
  movsd  D23(%rip),%xmm0
L204:
  movsd  %xmm0,(%rax)
  add    $0x8,%rax
  cmp    %rax,%rdx
  jne    L204
L69:
  lea    0x10(%rsp),%rdi
  mov    $0x0,%esi
  call   <gettimeofday@plt>
  mov    0x8(%rsp),%r14
  mov    %r14,%r8
  mov    %r15,%rcx
  mov    %r13,%rdx
  mov    %ebp,%esi
  mov    %ebx,%edi
  call   <matvec@plt>
  lea    0x20(%rsp),%rdi
  mov    $0x0,%esi
  call   <gettimeofday@plt>
  movsd  0x28(%rsp),%xmm0
  subsd  0x18(%rsp),%xmm0
  divsd  D16(%rip),%xmm0
  movsd  0x20(%rsp),%xmm1
  subsd  0x10(%rsp),%xmm1
  addsd  %xmm1,%xmm0
  lea    D27(%rip),%rdi
  mov    $0x1,%eax
  call   <printf@plt>
  mov    %r13,%rdi
  call   <free@plt>
  mov    %r15,%rdi
  call   <free@plt>
  mov    %r14,%rdi
  call   <free@plt>
  mov    0x38(%rsp),%rax
  sub    %fs:0x28,%rax
  jne    L110
  mov    $0x0,%eax
  add    $0x48,%rsp
  pop    %rbx
  pop    %rbp
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  ret
L126:
  mov    0x10(%r13),%rdi
  call   <atoi@plt>
  mov    %eax,%ebp
  mov    $0x32,%ebx
  test   %eax,%eax
  jns    L144
  mov    $0x1,%ebp
  mov    $0x32,%ebx
  jmp    L104
L110:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: unpack_data
arguments: tag: D28
data_type: byte[8]
name: unpack_data
arguments: tag: D10
data_type: string
name: unpack_data
arguments: tag: D23
data_type: f64
name: unpack_data
arguments: tag: D16
data_type: byte[8]
name: unpack_data
arguments: tag: D27
data_type: string

tool: {"D28": [0x00,0x00,0x00,0x00,0x00,0x00,0xf0,0xbf]}

tool: D10: Error: ancho de banda excesivo, N=%d, b=%d


tool: D23: 1

tool: {"D16": [0x00,0x00,0x00,0x00,0x80,0x84,0x2e,0x41]}

tool: D27: TIME TAKEN : %f seconds


assistant: ```c
int main(int argc, char **argv) {
  int i, j, N = 50, b = 1;
  double *A, *v, *w;
  if (argc > 1) {
    if ((N = atoi(argv[1])) < 0)
      N = 50;
  }
  if (argc > 2) {
    if ((b = atoi(argv[2])) < 0)
      b = 1;
  }
  if (b >= N) {
    printf("Error: ancho de banda excesivo, N=%d, b=%d\n", N, b);
    exit(1);
  }
  A = (double *)calloc(N * N, sizeof(double));
  v = (double *)calloc(N, sizeof(double));
  w = (double *)calloc(N, sizeof(double));
  for (i = 0; i < N; i++)
    A[i * N + i] = 2 * b;
  for (i = 0; i < N; i++) {
    for (j = 0; j < N; j++) {
      if (i != j && abs(i - j) <= b)
        A[i * N + j] = -1.0;
    }
  }
  for (i = 0; i < N; i++)
    v[i] = 1.0;
  struct timeval t1, t2;
  double elapsedTime;
  gettimeofday(&t1, NULL);
  matvec(N, b, A, v, w);
  gettimeofday(&t2, NULL);
  elapsedTime = (t2.tv_sec - t1.tv_sec) + ((t2.tv_usec - t1.tv_usec) / (1000.0 * 1000.0));
  printf("TIME TAKEN : %f seconds\n", elapsedTime);
  free(A);
  free(v);
  free(w);
  return 0;
}
```