gcc/testsuite/gcc.dg/pr45415.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O1 -fno-tree-dominator-opts" } */
   3
   4 typedef unsigned long int st;
   5 typedef unsigned long long dt;
   6 typedef union
   7 {
   8   dt d;
   9   struct
  10   {
  11     st h, l;
  12   }
  13   s;
  14 } t_be;
  15
  16 typedef union
  17 {
  18   dt d;
  19   struct
  20   {
  21     st l, h;
  22   }
  23   s;
  24 } t_le;
  25
  26 #define df(f, t) \
  27 int \
  28 f (t afh, t bfh) \
  29 { \
  30   t hh; \
  31   t hp, lp, dp, m; \
  32   st ad, bd; \
  33   int s; \
  34   s = 0; \
  35   ad = afh.s.h - afh.s.l; \
  36   bd = bfh.s.l - bfh.s.h; \
  37   if (bd > bfh.s.l) \
  38     { \
  39       bd = -bd; \
  40       s = ~s; \
  41     } \
  42   lp.d = (dt) afh.s.l * bfh.s.l; \
  43   hp.d = (dt) afh.s.h * bfh.s.h; \
  44   dp.d = (dt) ad *bd; \
  45   dp.d ^= s; \
  46   hh.d = hp.d + hp.s.h + lp.s.h + dp.s.h; \
  47   m.d = (dt) lp.s.h + hp.s.l + lp.s.l + dp.s.l; \
  48   return hh.s.l + m.s.l; \
  49 }
  50
  51 df(f_le, t_le)
  52 df(f_be, t_be)
  53
  54 void abort (void);
  55 void exit (int);
  56 main ()
  57 {
  58   t_be x;
  59   x.s.h = 0x10000000U;
  60   x.s.l = 0xe0000000U;
  61   if (x.d == 0x10000000e0000000ULL
  62       && f_be ((t_be) 0x100000000ULL, (t_be) 0x100000000ULL) != -1)
  63     abort ();
  64   if (x.d == 0xe000000010000000ULL
  65       && f_le ((t_le) 0x100000000ULL, (t_le) 0x100000000ULL) != -1)
  66     abort ();
  67   exit (0);
  68 }