gcc/testsuite/gcc.dg/pr46777.c

   1 /* PR rtl-optimization/46777 */
   2 /* { dg-do compile } */
   3 /* { dg-options "-fgcse -O -fno-tree-dominator-opts -funroll-loops" } */
   4
   5 struct S { char s[256]; };
   6
   7 static inline int
   8 foo (int x, int y)
   9 {
  10   switch (x)
  11     {
  12     case 1:
  13     case 2:
  14       return 3;
  15     case 3:
  16     case 4:
  17       return 2;
  18     case 5:
  19       switch (y)
  20         {
  21         case 4:
  22           return 1;
  23         }
  24     }
  25   return 0;
  26 }
  27
  28 void
  29 bar (struct S *x, int *y, int *z, int **w)
  30 {
  31   switch (*y ? x->s[*y] : foo (y[1], y[0]))
  32     {
  33     case 3:
  34       if (y + 2 == z)
  35         for (;;)
  36           {
  37             y += 2;
  38             switch (*y ? x->s[*y] : foo (y[1], y[0]))
  39               {
  40               case 6:
  41                 break;
  42               default:
  43                 *w = y;
  44               }
  45             if (y == z)
  46               break;
  47           }
  48     }
  49 }