/in/foo.c: In function 'main':
/in/foo.c:61:15: warning: iteration 300 invokes undefined behavior [-Waggressive-loop-optimizations]
         a3[i] = 0;
         ~~~~~~^~~
/in/foo.c:59:5: note: within this loop
     for (i = 0; i < 10000; i++)
     ^~~