bcj_test.c

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//
//
//  Author:     Lasse Collin
//
//  This file has been put into the public domain.
//  You can do whatever you want with this file.
//
 
extern int jump(int a, int b);
 
 
extern int
call(int a, int b)
{
    if (a < b)
        a = jump(a, b);
 
    return a;
}
 
 
extern int
jump(int a, int b)
{
    // The loop generates conditional jump backwards.
    while (1) {
        if (a < b) {
            a *= 2;
            a += 3 * b;
            break;
        } else {
            // Put enough code here to prevent JMP SHORT on x86.
            a += b;
            a /= 2;
            b += b % 5;
            a -= b / 3;
            b = 2 * b + a - 1;
            a *= b + a + 1;
            b += a - 1;
            a += b * 2 - a / 5;
        }
    }
 
    return a;
}
 
 
int
main(int argc, char **argv)
{
    int a = call(argc, argc + 1);
    return a == 0;
}