OpenMP: #pragma omp for (static)

omp_for_static.txt

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

void do_sth(void) { return; }

int main(void)
{
	int i, n = 100; 

#pragma omp for schedule(static)
	for (i = 0; i < n; i++)
		do_sth();

	return 0;
}

==============================================================================
After OpenMP lowering and expansion:
==============================================================================

/* libgomp/barrier.c:
 * - GOMP_barrier
 */

int main(void)
{
	int i, n = 100;
	int num_threads;
	int thread_num;
	int chunk_size;
	int from, to;

	num_threads = __builtin_omp_get_num_threads();
	thread_num = __builtin_omp_get_thread_num();
	chunk_size = n / num_threads;
	chunk_size += (chunk_size * num_threads != n);
	from = chunk_size * thread_num;
	to = from + chunk_size;
	if (to > 100)
		to = 100;

	for (i = from; i < to; i++) {
		do_sth();
	}

	__builtin_GOMP_barrier();

	return 0;
}