gcc/testsuite/gcc.c-torture/execute/20100430-1.c

   1 /* This used to generate unaligned accesses at -O2 because of IVOPTS.  */
   2
   3 struct packed_struct
   4 {
   5   struct packed_struct1
   6   {
   7     unsigned char cc11;
   8     unsigned char cc12;
   9   } __attribute__ ((packed)) pst1;
  10   struct packed_struct2
  11   {
  12     unsigned char cc21;
  13     unsigned char cc22;
  14     unsigned short ss[104];
  15     unsigned char cc23[13];
  16   } __attribute__ ((packed)) pst2[4];
  17 } __attribute__ ((packed));
  18
  19 typedef struct
  20 {
  21   int ii;
  22   struct packed_struct buf;
  23 } info_t;
  24
  25 static unsigned short g;
  26
  27 static void __attribute__((noinline))
  28 dummy (unsigned short s)
  29 {
  30   g = s;
  31 }
  32
  33 static int
  34 foo (info_t *info)
  35 {
  36   int i, j;
  37
  38   for (i = 0; i < info->buf.pst1.cc11; i++)
  39     for (j = 0; j < info->buf.pst2[i].cc22; j++)
  40       dummy (info->buf.pst2[i].ss[j]);
  41
  42   return 0;
  43 }
  44
  45 int main(void)
  46 {
  47   info_t info;
  48   info.buf.pst1.cc11 = 2;
  49   info.buf.pst2[0].cc22 = info.buf.pst2[1].cc22 = 8;
  50   return foo (&info);
  51 }