user: Converte this assembly snippet into its equivalent C code:

```asm
<benchmark>:
  endbr64
  push   %rbp
  mov    %rsp,%rbp
  push   %r15
  push   %r14
  push   %r13
  mov    %edi,%r13d
  push   %r12
  mov    %esi,%r12d
  push   %rbx
  sub    $0x28,%rsp
  mov    %fs:0x28,%rax
  mov    %rax,-0x38(%rbp)
  xor    %eax,%eax
  movslq %esi,%rax
  mov    %rsp,%rcx
  lea    0xf(,%rax,4),%rax
  mov    %rax,%rdx
  and    $0xfffffffffffff000,%rax
  sub    %rax,%rcx
  and    $0xfffffffffffffff0,%rdx
  cmp    %rcx,%rsp
  je     L139
L49:
  sub    $0x1000,%rsp
  orq    $0x0,0xff8(%rsp)
  cmp    %rcx,%rsp
  jne    L49
L139:
  and    $0xfff,%edx
  sub    %rdx,%rsp
  test   %rdx,%rdx
  jne    L112
L32:
  mov    %rsp,%r14
  test   %r12d,%r12d
  jle    L14
  mov    %r12d,%eax
  mov    %r14,%rbx
  lea    (%r14,%rax,4),%r15
  jmp    L108
  nopl   0x0(%rax,%rax,1)
L78:
  pxor   %xmm0,%xmm0
  add    $0x4,%rbx
  divss  %xmm0,%xmm0
  movss  %xmm0,-0x4(%rbx)
  cmp    %r15,%rbx
  je     L14
L108:
  xor    %eax,%eax
  call   <rand_float@plt>
  movss  D26(%rip),%xmm1
  comiss %xmm0,%xmm1
  ja     L78
  xor    %eax,%eax
  add    $0x4,%rbx
  call   <rand_float@plt>
  mulss  D28(%rip),%xmm0
  subss  D34(%rip),%xmm0
  movss  %xmm0,-0x4(%rbx)
  cmp    %r15,%rbx
  jne    L108
L14:
  xor    %eax,%eax
  call   <tic@plt>
  movsd  %xmm0,-0x48(%rbp)
  test   %r13d,%r13d
  jle    L126
  xor    %ebx,%ebx
  jmp    L128
  nopl   0x0(%rax)
L13:
  add    $0x1,%ebx
  cmp    %ebx,%r13d
  je     L126
L128:
  mov    $0x1,%edx
  mov    %r14,%rsi
  mov    %r12d,%edi
  call   <stdlib_strided_snansumkbn@plt>
  ucomiss %xmm0,%xmm0
  jnp    L13
  lea    D23(%rip),%r12
  mov    %r12,%rdi
  call   <printf@plt>
  xor    %eax,%eax
  call   <tic@plt>
  subsd  -0x48(%rbp),%xmm0
  mov    %r12,%rdi
  movsd  %xmm0,-0x48(%rbp)
  call   <printf@plt>
  movsd  -0x48(%rbp),%xmm0
L148:
  mov    -0x38(%rbp),%rax
  sub    %fs:0x28,%rax
  jne    L19
  lea    -0x28(%rbp),%rsp
  pop    %rbx
  pop    %r12
  pop    %r13
  pop    %r14
  pop    %r15
  pop    %rbp
  ret
L126:
  xor    %eax,%eax
  call   <tic@plt>
  subsd  -0x48(%rbp),%xmm0
  jmp    L148
  xchg   %ax,%ax
L112:
  orq    $0x0,-0x8(%rsp,%rdx,1)
  jmp    L32
L19:
  call   <__stack_chk_fail@plt>
```

tool_calls: name: parse_data
arguments: label: D26
data_type: byte[4]
name: parse_data
arguments: label: D28
data_type: byte[4]
name: parse_data
arguments: label: D34
data_type: byte[4]
name: parse_data
arguments: label: D23
data_type: string

tool: {"D26": [0xcd,0xcc,0x4c,0x3e]}

tool: {"D28": [0x00,0x40,0x9c,0x46]}

tool: {"D34": [0x00,0x40,0x1c,0x46]}

tool: D23: should not return NaN


assistant: ```c
double benchmark(int iterations, int len) {
  double elapsed;
  float x[len];
  float v;
  double t;
  int i;
  for (i = 0; i < len; i++) {
    if (rand_float() < 0.2f) {
      x[i] = 0.0f / 0.0f;
    } else {
      x[i] = (rand_float() * 20000.0f) - 10000.0f;
    }
  }
  v = 0.0f;
  t = tic();
  for (i = 0; i < iterations; i++) {
    v = stdlib_strided_snansumkbn(len, x, 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;
}
```