user: Please show me the C implementation that matches the assembly code listed below:

```asm
<benchmark>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  push   %r15
  push   %r14
  push   %r13
  push   %r12
  push   %rbx
  sub    $0x68,%rsp
  mov    %edi,-0x84(%rbp)
  mov    %esi,-0x88(%rbp)
  mov    %fs:0x28,%rax
  mov    %rax,-0x38(%rbp)
  xor    %eax,%eax
  mov    %rsp,%rax
  mov    %rax,%rbx
  mov    -0x88(%rbp),%eax
  movslq %eax,%rdx
  sub    $0x1,%rdx
  mov    %rdx,-0x68(%rbp)
  movslq %eax,%rdx
  mov    %rdx,%r14
  mov    $0x0,%r15d
  movslq %eax,%rdx
  mov    %rdx,%r12
  mov    $0x0,%r13d
  cltq
  mov    $0x10,%edx
  sub    $0x1,%rdx
  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
L127:
  cmp    %rdx,%rsp
  je     L5
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  jmp    L127
L5:
  mov    %rax,%rdx
  and    $0xfff,%edx
  sub    %rdx,%rsp
  mov    %rax,%rdx
  and    $0xfff,%edx
  test   %rdx,%rdx
  je     L21
  and    $0xfff,%eax
  sub    $0x8,%rax
  add    %rsp,%rax
  orq    $0x0,(%rax)
L21:
  mov    %rsp,%rax
  add    $0x0,%rax
  mov    %rax,-0x60(%rbp)
  mov    -0x88(%rbp),%eax
  movslq %eax,%rdx
  sub    $0x1,%rdx
  mov    %rdx,-0x58(%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,%edi
  mov    $0x0,%edx
  div    %rdi
  imul   $0x10,%rax,%rax
  mov    %rax,%rcx
  and    $0xfffffffffffff000,%rcx
  mov    %rsp,%rdx
  sub    %rcx,%rdx
L19:
  cmp    %rdx,%rsp
  je     L49
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  jmp    L19
L49:
  mov    %rax,%rdx
  and    $0xfff,%edx
  sub    %rdx,%rsp
  mov    %rax,%rdx
  and    $0xfff,%edx
  test   %rdx,%rdx
  je     L20
  and    $0xfff,%eax
  sub    $0x8,%rax
  add    %rsp,%rax
  orq    $0x0,(%rax)
L20:
  mov    %rsp,%rax
  add    $0x7,%rax
  shr    $0x3,%rax
  shl    $0x3,%rax
  mov    %rax,-0x50(%rbp)
  movl   $0x0,-0x74(%rbp)
  jmp    L64
L43:
  mov    $0x0,%eax
  call   <rand_double@plt>
  movsd  D7(%rip),%xmm1
  comisd %xmm0,%xmm1
  jbe    L54
  mov    -0x60(%rbp),%rdx
  mov    -0x74(%rbp),%eax
  cltq
  movb   $0x1,(%rdx,%rax,1)
  jmp    L33
L54:
  mov    -0x60(%rbp),%rdx
  mov    -0x74(%rbp),%eax
  cltq
  movb   $0x0,(%rdx,%rax,1)
L33:
  mov    $0x0,%eax
  call   <rand_double@plt>
  movsd  D22(%rip),%xmm1
  mulsd  %xmm1,%xmm0
  movsd  D47(%rip),%xmm1
  subsd  %xmm1,%xmm0
  mov    -0x50(%rbp),%rax
  mov    -0x74(%rbp),%edx
  movslq %edx,%rdx
  movsd  %xmm0,(%rax,%rdx,8)
  addl   $0x1,-0x74(%rbp)
L64:
  mov    -0x74(%rbp),%eax
  cmp    -0x88(%rbp),%eax
  jl     L43
  pxor   %xmm0,%xmm0
  movsd  %xmm0,-0x70(%rbp)
  mov    $0x0,%eax
  call   <tic@plt>
  movq   %xmm0,%rax
  mov    %rax,-0x48(%rbp)
  movl   $0x0,-0x74(%rbp)
  jmp    L134
L22:
  mov    -0x60(%rbp),%rdx
  mov    -0x50(%rbp),%rsi
  mov    -0x88(%rbp),%eax
  mov    $0x1,%r8d
  mov    %rdx,%rcx
  mov    $0x1,%edx
  mov    %eax,%edi
  call   <stdlib_strided_dmskmax@plt>
  movq   %xmm0,%rax
  mov    %rax,-0x70(%rbp)
  movsd  -0x70(%rbp),%xmm0
  ucomisd -0x70(%rbp),%xmm0
  jnp    L59
  lea    D48(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
  jmp    L105
L59:
  addl   $0x1,-0x74(%rbp)
L134:
  mov    -0x74(%rbp),%eax
  cmp    -0x84(%rbp),%eax
  jl     L22
L105:
  mov    $0x0,%eax
  call   <tic@plt>
  movq   %xmm0,%rax
  movq   %rax,%xmm0
  subsd  -0x48(%rbp),%xmm0
  movsd  %xmm0,-0x40(%rbp)
  movsd  -0x70(%rbp),%xmm0
  ucomisd -0x70(%rbp),%xmm0
  jnp    L110
  lea    D48(%rip),%rax
  mov    %rax,%rdi
  call   <printf@plt>
L110:
  movsd  -0x40(%rbp),%xmm0
  mov    %rbx,%rsp
  movq   %xmm0,%rax
  mov    -0x38(%rbp),%rdx
  sub    %fs:0x28,%rdx
  je     L17
  call   <__stack_chk_fail@plt>
L17:
  movq   %rax,%xmm0
  lea    -0x28(%rbp),%rsp
  pop    %rbx
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  pop    %rbp
  ret
```

tool_calls: name: parse_data
arguments: data_tag: D7
type_guessed: f64
name: parse_data
arguments: data_tag: D22
type_guessed: f64
name: parse_data
arguments: data_tag: D47
type_guessed: f64
name: parse_data
arguments: data_tag: D48
type_guessed: string

tool: D7: 0.2

tool: D22: 20000

tool: D47: 10000

tool: D48: should not return NaN


assistant: ```c
double benchmark(int iterations, int len) {
  unsigned char mask[len];
  double elapsed;
  double x[len];
  double v;
  double t;
  int i;
  for (i = 0; i < len; i++) {
    if (rand_double() < 0.2) {
      mask[i] = 1;
    } else {
      mask[i] = 0;
    }
    x[i] = (rand_double() * 20000.0) - 10000.0;
  }
  v = 0.0;
  t = tic();
  for (i = 0; i < iterations; i++) {
    v = stdlib_strided_dmskmax(len, x, 1, mask, 1);
    if (v != v) {
      printf("should not return NaN\n");
      break;
    }
  }
  elapsed = tic() - t;
  if (v != v) {
    printf("should not return NaN\n");
  }
  return elapsed;
}
```