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

```asm
<benchmark>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  push   %rbx
  sub    $0x68,%rsp
  mov    %edi,-0x64(%rbp)
  mov    %esi,-0x68(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x18(%rbp)
  xor    %eax,%eax
  mov    %rsp,%rax
  mov    %rax,%rbx
  mov    -0x68(%rbp),%eax
  movslq %eax,%rdx
  sub    $0x1,%rdx
  mov    %rdx,-0x50(%rbp)
  movslq %eax,%rdx
  mov    %rdx,%r10
  mov    $0x0,%r11d
  movslq %eax,%rdx
  mov    %rdx,%r8
  mov    $0x0,%r9d
  cltq
  lea    0x0(,%rax,8),%rdx
  mov    $0x10,%eax
  sub    $0x1,%rax
  add    %rdx,%rax
  mov    $0x10,%esi
  mov    $0x0,%edx
  div    %rsi
  imul   $0x10,%rax,%rax
  mov    %rax,%rcx
  and    $0xfffffffffffff000,%rcx
  mov    %rsp,%rdx
  sub    %rcx,%rdx
L77:
  cmp    %rdx,%rsp
  je     L35
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  jmp    L77
L35:
  mov    %rax,%rdx
  and    $0xfff,%edx
  sub    %rdx,%rsp
  mov    %rax,%rdx
  and    $0xfff,%edx
  test   %rdx,%rdx
  je     L99
  and    $0xfff,%eax
  sub    $0x8,%rax
  add    %rsp,%rax
  orq    $0x0,(%rax)
L99:
  mov    %rsp,%rax
  add    $0x7,%rax
  shr    $0x3,%rax
  shl    $0x3,%rax
  mov    %rax,-0x48(%rbp)
  movl   $0x0,-0x54(%rbp)
  jmp    L97
L65:
  mov    $0x0,%eax
  call   <rand_double@plt>
  movsd  D11(%rip),%xmm1
  mulsd  %xmm1,%xmm0
  movsd  D15(%rip),%xmm1
  subsd  %xmm1,%xmm0
  mov    -0x48(%rbp),%rax
  mov    -0x54(%rbp),%edx
  movslq %edx,%rdx
  movsd  %xmm0,(%rax,%rdx,8)
  addl   $0x1,-0x54(%rbp)
L97:
  mov    -0x54(%rbp),%eax
  cmp    -0x68(%rbp),%eax
  jl     L65
  pxor   %xmm0,%xmm0
  movsd  %xmm0,-0x30(%rbp)
  pxor   %xmm0,%xmm0
  movsd  %xmm0,-0x28(%rbp)
  mov    $0x0,%eax
  call   <tic@plt>
  movq   %xmm0,%rax
  mov    %rax,-0x40(%rbp)
  movl   $0x0,-0x54(%rbp)
  jmp    L87
L27:
  lea    -0x30(%rbp),%rdx
  mov    -0x48(%rbp),%rsi
  mov    D6(%rip),%rdi
  mov    -0x68(%rbp),%eax
  mov    $0x1,%r8d
  mov    %rdx,%rcx
  mov    $0x1,%edx
  movq   %rdi,%xmm0
  mov    %eax,%edi
  call   <stdlib_strided_dmeanstdevpn@plt>
  mov    -0x54(%rbp),%eax
  cltd
  shr    $0x1f,%edx
  add    %edx,%eax
  and    $0x1,%eax
  sub    %edx,%eax
  cltq
  movsd  -0x30(%rbp,%rax,8),%xmm0
  mov    -0x54(%rbp),%eax
  cltd
  shr    $0x1f,%edx
  add    %edx,%eax
  and    $0x1,%eax
  sub    %edx,%eax
  cltq
  movsd  -0x30(%rbp,%rax,8),%xmm1
  ucomisd %xmm1,%xmm0
  jp     L8
  ucomisd %xmm1,%xmm0
  je     L20
L8:
  lea    D37(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  jmp    L23
L20:
  addl   $0x1,-0x54(%rbp)
L87:
  mov    -0x54(%rbp),%eax
  cmp    -0x64(%rbp),%eax
  jl     L27
L23:
  mov    $0x0,%eax
  call   <tic@plt>
  movq   %xmm0,%rax
  movq   %rax,%xmm0
  subsd  -0x40(%rbp),%xmm0
  movsd  %xmm0,-0x38(%rbp)
  mov    -0x54(%rbp),%eax
  cltd
  shr    $0x1f,%edx
  add    %edx,%eax
  and    $0x1,%eax
  sub    %edx,%eax
  cltq
  movsd  -0x30(%rbp,%rax,8),%xmm0
  mov    -0x54(%rbp),%eax
  cltd
  shr    $0x1f,%edx
  add    %edx,%eax
  and    $0x1,%eax
  sub    %edx,%eax
  cltq
  movsd  -0x30(%rbp,%rax,8),%xmm1
  ucomisd %xmm1,%xmm0
  jp     L115
  ucomisd %xmm1,%xmm0
  je     L81
L115:
  lea    D37(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
L81:
  movsd  -0x38(%rbp),%xmm0
  mov    %rbx,%rsp
  movq   %xmm0,%rax
  mov    -0x18(%rbp),%rdx
  sub    %fs:0x28,%rdx
  je     L36
  call   <__stack_chk_fail@plt>
L36:
  movq   %rax,%xmm0
  mov    -0x8(%rbp),%rbx
  leave
  ret
```

tool_calls: name: read_data
arguments: tag: D11
type_guessed: f64
name: read_data
arguments: tag: D15
type_guessed: f64
name: read_data
arguments: tag: D6
type_guessed: f64
name: read_data
arguments: tag: D37
type_guessed: string

tool: D11: 20000

tool: D15: 10000

tool: D6: 1

tool: D37: should not return NaN


assistant: ```c
double benchmark(int iterations, int len) {
  double elapsed;
  double out[2];
  double x[len];
  double t;
  int i;
  for (i = 0; i < len; i++) {
    x[i] = (rand_double() * 20000.0) - 10000.0;
  }
  out[0] = 0.0;
  out[1] = 0.0;
  t = tic();
  for (i = 0; i < iterations; i++) {
    stdlib_strided_dmeanstdevpn(len, 1.0, x, 1, out, 1);
    if (out[i % 2] != out[i % 2]) {
      printf("should not return NaN\n");
      break;
    }
  }
  elapsed = tic() - t;
  if (out[i % 2] != out[i % 2]) {
    printf("should not return NaN\n");
  }
  return elapsed;
}
```