Subversion Repositories openrisc_2011-10-31

/* PR optimization/11864

 * Reporter: Kazumoto Kojima <kkojima@gcc.gnu.org>

 * Summary: [3.3/3.4 regression] miscompiles zero extension and test

 * Description:

 * gcc-3.3/3.4 -O2 for sh target may miscompile the combination of zero extension

 * and test if it's zero.

 *

 * Testcase tweaked by dank@kegel.com.  Not marked as xfail because it's a regression.

 */

/* { dg-do run } */

/* { dg-options "-O2" } */

extern void abort(void);

int val = 0xff00;

int f(void)

{

        return val;

}

unsigned char a[1];

void foo(void)

{

        a[0] = f() & 255;

        if (!a[0])

                a[0] = f() & 255;

        if (!a[0])

                a[0] = 1 + (f() & 127);

}

int main(int argc, char **argv)

{

        foo();

        if (!a[0])

                abort();

        return 0;

}