gcc/testsuite/gcc.dg/no-strict-overflow-6.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-fno-strict-overflow -O2 -fdump-tree-optimized" } */
   3
   4 /* Source: Ian Lance Taylor.  */
   5
   6 /* VRP test.  We can not simplify the conditional when not using
   7    strict overflow semantics.  We don't test this with
   8    -fstrict-overflow because it turns into an infinite loop.  That is
   9    OK but it would also be OK to not do that.  */
  10
  11 int
  12 foo ()
  13 {
  14   int i, bits;
  15   for (i = 1, bits = 1; i > 0; i += i)
  16     ++bits;
  17   return bits - sizeof(int) * __CHAR_BIT__;
  18 }
  19
  20 /* { dg-final { scan-tree-dump "return 0" "optimized" } } */