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/* { dg-options "-fcilkplus" } */
/* { dg-do run { target i?86-*-* x86_64-*-* } } */
/* { dg-options "-fcilkplus -lcilkrts" { target { i?86-*-* x86_64-*-* } } } */
#if HAVE_IO
#include <stdio.h>
#endif
#define FIB_ITERATION 30
void fib (int *, int);
int fib_serial (int);
int main(void)
{
int ii = 0, error = 0;
int fib_result[FIB_ITERATION+1], fib_serial_result[FIB_ITERATION+1];
#if HAVE_IO
for (ii = 0; ii <= FIB_ITERATION; ii++)
{
int result = 0;
fib (&result, ii);
printf("fib (%2d) = %10d\n", ii, result);
}
#else
for (ii = 0; ii <= FIB_ITERATION; ii++)
{
fib (&fib_result[ii], ii);
}
fib_serial_result[0] = 0;
fib_serial_result[1] = 1;
for (ii = 2; ii <= FIB_ITERATION; ii++)
fib_serial_result[ii] = fib_serial_result[ii-1] + fib_serial_result[ii-2];
for (ii = 0; ii <= FIB_ITERATION; ii++)
{
if (fib_result[ii] != fib_serial_result[ii])
__builtin_abort ();
}
#endif
return 0;
}
int fib_serial (int n)
{
int x = 0, y = 0;
if (n < 2)
return n;
else
{
x = fib_serial (n-1);
y = fib_serial (n-2);
return (x+y);
}
}
void fib(int *result, int n)
{
int x = 0, y = 0;
if (n < 2)
x = n;
else
{
_Cilk_spawn fib(&x, n-1);
fib(&y, n-2);
_Cilk_sync;
}
*result = (x+y);
}
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