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

```asm
<benchmark>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbx
  sub    $0x28,%rsp
  mov    %edi,%r15d
  mov    %esi,%r14d
  mov    %fs:0x28,%rax
  mov    %rax,-0x38(%rbp)
  xor    %eax,%eax
  movslq %esi,%rax
  shl    $0x3,%rax
  lea    0xf(%rax),%rdx
  mov    %rdx,%rsi
  and    $0xfffffffffffffff0,%rsi
  and    $0xfffffffffffff000,%rdx
  mov    %rsp,%rcx
  sub    %rdx,%rcx
L102:
  cmp    %rcx,%rsp
  je     L109
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  jmp    L102
L109:
  mov    %rsi,%rdx
  and    $0xfff,%edx
  sub    %rdx,%rsp
  test   %rdx,%rdx
  je     L56
  orq    $0x0,-0x8(%rsp,%rdx,1)
L56:
  mov    %rsp,%r12
  add    $0xf,%rax
  mov    %rax,%rcx
  and    $0xfffffffffffffff0,%rcx
  and    $0xfffffffffffff000,%rax
  mov    %rsp,%rdx
  sub    %rax,%rdx
L97:
  cmp    %rdx,%rsp
  je     L143
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  jmp    L97
L143:
  mov    %rcx,%rax
  and    $0xfff,%eax
  sub    %rax,%rsp
  test   %rax,%rax
  je     L137
  orq    $0x0,-0x8(%rsp,%rax,1)
L137:
  mov    %rsp,%r13
  test   %r14d,%r14d
  jle    L38
  mov    %r14d,%eax
  mov    %rax,-0x48(%rbp)
  mov    $0x0,%ebx
L89:
  mov    $0x0,%eax
  call   <rand_double@plt>
  mulsd  D22(%rip),%xmm0
  subsd  D4(%rip),%xmm0
  movsd  %xmm0,(%r12,%rbx,8)
  movq   $0x0,0x0(%r13,%rbx,8)
  add    $0x1,%rbx
  cmp    -0x48(%rbp),%rbx
  jne    L89
L38:
  mov    $0x0,%eax
  call   <tic@plt>
  movsd  %xmm0,-0x48(%rbp)
  test   %r15d,%r15d
  jle    L117
  mov    $0x0,%ebx
L86:
  movsd  D9(%rip),%xmm0
  addsd  (%r12),%xmm0
  movsd  %xmm0,(%r12)
  mov    $0x1,%r8d
  mov    %r13,%rcx
  mov    $0x1,%edx
  mov    %r12,%rsi
  pxor   %xmm0,%xmm0
  mov    %r14d,%edi
  call   <stdlib_strided_dcusumpw@plt>
  movsd  0x0(%r13),%xmm0
  ucomisd %xmm0,%xmm0
  jp     L80
  add    $0x1,%ebx
  cmp    %ebx,%r15d
  jne    L86
  jmp    L117
L80:
  lea    D12(%rip),%rdi
  call   <printf@plt>
L117:
  mov    $0x0,%eax
  call   <tic@plt>
  subsd  -0x48(%rbp),%xmm0
  movq   %xmm0,%rbx
  sub    $0x1,%r14d
  movslq %r14d,%r14
  movsd  0x0(%r13,%r14,8),%xmm0
  ucomisd %xmm0,%xmm0
  jp     L22
L20:
  mov    -0x38(%rbp),%rax
  sub    %fs:0x28,%rax
  jne    L121
  movq   %rbx,%xmm0
  lea    -0x28(%rbp),%rsp
  pop    %rbx
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  pop    %rbp
  ret
L22:
  lea    D12(%rip),%rdi
  call   <printf@plt>
  jmp    L20
L121:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: read_data
arguments: data_tag: D22
data_type: f64
name: read_data
arguments: data_tag: D4
data_type: f64
name: read_data
arguments: data_tag: D9
data_type: f64
name: read_data
arguments: data_tag: D12
data_type: string

tool: D22: 20000

tool: D4: 10000

tool: D9: 1

tool: D12: should not return NaN


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