gnu/dist/gcc4/gcc/testsuite/gcc.c-torture/execute/20020614-1.c

   1 /* PR c/6677 */
   2 /* Verify that GCC doesn't perform illegal simplifications
   3    when folding constants.  */
   4
   5 #include <limits.h>
   6
   7 extern void abort (void);
   8 extern void exit (int);
   9
  10 int main (void)
  11 {
  12   int i;
  13   signed char j;
  14   unsigned char k;
  15
  16   i = SCHAR_MAX;
  17
  18   j = ((signed char) (i << 1)) / 2;
  19
  20   if (j != -1)
  21     abort();
  22
  23   j = ((signed char) (i * 2)) / 2;
  24
  25   if (j != -1)
  26     abort();
  27
  28   i = UCHAR_MAX;
  29
  30   k = ((unsigned char) (i << 1)) / 2;
  31
  32   if (k != UCHAR_MAX/2)
  33     abort();
  34
  35   k = ((unsigned char) (i * 2)) / 2;
  36
  37   if (k != UCHAR_MAX/2)
  38     abort();
  39
  40   exit(0);
  41 }