svcomp_BradleyMannaSipma-2005CAV-Fig1_true-alloca.c

contents

#include <stdlib.h>

/*
 * Program from Fig.1 of
 * 2005CAV - Bradley,Manna,Sipma - Linear Ranking with Reachability
 *
 * Date: 12.12.2013
 * Author: heizmann@informatik.uni-freiburg.de
 *
 */

extern int __VERIFIER_nondet_int(void);


int main() {
        int *x = alloca(sizeof(int));
	int *y = alloca(sizeof(int));
	int *N = alloca(sizeof(int));
	*x = __VERIFIER_nondet_int();
	*y = __VERIFIER_nondet_int();
	*N = __VERIFIER_nondet_int();
	// continue only for values where there won't be any overflow or underflow
	// on systems where sizeof(int)=4 holds.
	if (*N >= 536870912 || *x >= 536870912 || *y >= 536870912 || *x < -1073741824) {
		return 0;
	}
	if (*x + *y >= 0) {
		while (*x <= *N) {
			if (__VERIFIER_nondet_int()) {
			        *x = 2*(*x) + *y;
				*y = *y + 1;
			} else {
				*x = *x + 1;
			}
		}
	}
	return 0;
}

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