gcc/libgomp/testsuite/libgomp.c/examples-4/simd-7.c

/* { dg-do run { target vect_simd_clones } } */
/* { dg-additional-options "-msse2" { target sse2_runtime } } */
/* { dg-additional-options "-mavx" { target avx_runtime } } */

#include <stdio.h>
#include <stdlib.h>

#define N 30
int a[N], a_ref[N], b[N];

#pragma omp declare simd inbranch
int fib( int n )
{
  if (n <= 1)
    return n;
  else
    return fib(n-1) + fib(n-2);
}

void fib_ref()
{
  int i;

  a_ref[0] = 0;
  a_ref[1] = 1;

  for (i=2; i < N; i++)
    a_ref[i] = a_ref[i-2] + a_ref[i-1];
}

int main(void)
{
  int i;

#pragma omp simd
  for (i=0; i < N; i++)
    b[i] = i;

#pragma omp simd
  for (i=0; i < N; i++)
    a[i] = fib(b[i]);

  fib_ref ();

  for (i=0; i < N; i++)
    if (a[i] != a_ref[i])
      abort ();

  return 0;
}