gcc/testsuite/gcc.dg/torture/tree-loop-1.c

   1 /* PR tree-optimization/20640 */
   2
   3 /* After unrolling the loop, we'd turn some conditional branches into
   4    unconditional ones, but branch redirection would fail to compute
   5    the PHI args for the PHI nodes in the replacement edge
   6    destination, so they'd remain NULL causing crashes later on.  */
   7
   8 /* { dg-do compile } */
   9
  10 static int a = 0;
  11 extern int foo (void);
  12 extern int *bar (void) __attribute__ ((__const__));
  13
  14 void
  15 test (int x)
  16 {
  17   int b = 10;
  18   while (foo () == -1 && *bar () == 4 && b > 0)
  19     --b;
  20   a = x;
  21 }