/*
 * Tested with:
 * gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu1)
 *
 * Without the mem_align() macro, the "if ((size_t)pt & 0xff)" is optimized
 * away by the compiler (even using -O0) and unaligned pointers are seen
 * but not printed as such.
 *
 * The scope of this test program was to see if even the mem_align() macro
 * may be optimized away, but that does not seem to be the case.
 */

#include <stdio.h>
#include <string.h>
#ifdef _OPENMP
#include <omp.h>
#endif

#define mem_align(a,b) (void*)(((char*)(a))+(((b)-1)-(((size_t)((char*)(a))-1)&((b)-1))))

int main(int argc, char **argv)
{
	int i;

#ifdef _OPENMP
#pragma omp parallel for
#endif
	for (i = 0; i < argc; i++) {
#if 1
		__attribute__ ((aligned(256))) char pt[1024];
#else
		__attribute__ ((aligned(256))) char _pt[1024];
		char *pt = mem_align(_pt, 256);
#endif

		sprintf(pt, "%p ", pt);
		strcat(pt, argv[i]);
        if ((size_t)pt & 0xff)
                printf("%s unaligned!\n", pt);
        else
                puts(pt);
	}
	return 0;
}