src/patches/gcc-pr28045.patch

   1 Index: fold-const.c
   2 ===================================================================
   3 *** gcc4.0.3/gcc/fold-const.c   (revision 114755)
   4 --- gcc4.0.3/fold-const.c       (working copy)
   5 *************** operand_equal_p (tree arg0, tree arg1, u
   6 *** 2497,2502 ****
   7 --- 2497,2507 ----
   8     if (TYPE_UNSIGNED (TREE_TYPE (arg0)) != TYPE_UNSIGNED (TREE_TYPE (arg1)))
   9       return 0;
  10
  11 +   /* If both types don't have the same precision, then it is not safe
  12 +      to strip NOPs.  */
  13 +   if (TYPE_PRECISION (TREE_TYPE (arg0)) != TYPE_PRECISION (TREE_TYPE (arg1)))
  14 +     return 0;
  15 +
  16     STRIP_NOPS (arg0);
  17     STRIP_NOPS (arg1);
  18
  19
  20
  21 /* { dg-do run } */
  22
  23 extern void abort(void);
  24 struct a
  25 {
  26    unsigned int bits : 1;
  27    signed long val : ((sizeof(long) * 8) - 1);
  28 };
  29 int Fnegate (struct a b)
  30 {
  31   if ((-((long)b.val)) <= ((long) ((1UL << ((sizeof(long) * 8) - 2)) -1UL))
  32       && (-((long)b.val)) >= (-(((long) ((1UL << ((sizeof(long) * 8) - 2)) -1UL))) - 1))
  33      return 0 ;
  34   abort ();
  35 }
  36 int main ()
  37 {
  38   struct a b = {1, 1};
  39   Fnegate (b);
  40   return 0;
  41 }