gcc/testsuite/gcc.dg/pr108582-1.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O3 -fno-tree-ccp -fno-tree-dce" } */
   3
   4 /*
   5   PHI-OPT via match_simplify_replacement used to transform:
   6   if (_25 != 0)
   7     goto <bb 8>; [25.00%]
   8   else
   9     goto <bb 9>; [75.00%]
  10
  11   <bb 8> [local count: 11649864]:
  12   # iftmp.5_13 = PHI <2(7)>
  13   k_22 = k_11 | iftmp.5_13;
  14
  15   <bb 9> [local count: 105655256]:
  16   # g_9 = PHI <1(2), 0(8), g_8(7)>
  17   # k_12 = PHI <k_20(D)(2), k_22(8), k_11(7)>
  18
  19 into:
  20
  21   _15 = (int) _25;
  22   _28 = -_15;
  23   _4 = _13 & _28;
  24   _6 = _4 | k_11;
  25
  26   <bb 8> [local count: 105655256]:
  27   # g_9 = PHI <1(2), g_8(7)>
  28   # k_12 = PHI <k_20(D)(2), _6(7)>
  29
  30 Removing the phi-node/assignment of _13.
  31
  32  */
  33
  34 int a, c, d, e, f;
  35 char b;
  36 int main() {
  37   int g = 1;
  38   char h[1] = {0};
  39   while (a) {
  40     if (f) {
  41       b = 0;
  42       if (d)
  43         continue;
  44     }
  45     if (a < 1) {
  46       g = 0;
  47       goto L;
  48     }
  49   }
  50   while (c) {
  51     char *j = h;
  52     int k;
  53   L:
  54     if (e && !g)
  55       k |= 2 | (*j < 0);
  56   }
  57   return 0;
  58 }