gcc/testsuite/gcc.dg/pr104459.c

   1 /* PR rtl-optimization/104459 */
   2 /* { dg-do compile } */
   3 /* { dg-options "-O2 -funswitch-loops -fno-tree-dce -fcompare-debug -w" } */
   4
   5 void
   6 foo (int x, int y)
   7 {
   8   unsigned int a;
   9
  10   for (;;)
  11     {
  12       short int *p = (short int *) &x;
  13       unsigned int q = 0;
  14
  15       a /= 2;
  16       if (a)
  17         {
  18           q -= y;
  19           while (q)
  20             ;
  21         }
  22
  23       if (x)
  24         {
  25           for (q = 0; q != 1; q += 2)
  26             {
  27               unsigned int n;
  28
  29               n = *p ? 0 : q;
  30               y += n < 1;
  31
  32               n = a || *p;
  33               if (n % x == 0)
  34                 y /= x;
  35             }
  36         }
  37     }
  38 }