gcc/testsuite/gcc.dg/pr38934.c

   1 /* PR middle-end/38934 */
   2 /* { dg-do compile } */
   3 /* { dg-options "-O2 -std=gnu99 -w" } */
   4
   5 /* This variable needed only to work around earlier optimizations than VRP.  */
   6 unsigned char g;
   7
   8 extern void abort ();
   9
  10 void
  11 f (long long int p)
  12 {
  13   g = 255;
  14   if (p >= -9223372036854775808LL - (signed char) g)
  15     p = 1;
  16
  17   if (p)
  18     abort ();
  19 }