gcc/testsuite/gcc.dg/tree-ssa/pr81396.c

   1 /* PR tree-optimization/81396 */
   2 /* { dg-do compile } */
   3 /* { dg-options "-O2 -fdump-tree-optimized" } */
   4
   5 typedef unsigned long long uint64_t;
   6
   7 uint64_t
   8 foo (uint64_t word)
   9 {
  10 #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ && __SIZEOF_LONG_LONG__ == 8
  11   const unsigned char *const ptr = (const unsigned char *) &word;
  12   return ((uint64_t) ptr[0]
  13           | ((uint64_t) ptr[1] << 8)
  14           | ((uint64_t) ptr[2] << (8 * 2))
  15           | ((uint64_t) ptr[3] << (8 * 3))
  16           | ((uint64_t) ptr[4] << (8 * 4))
  17           | ((uint64_t) ptr[5] << (8 * 5))
  18           | ((uint64_t) ptr[6] << (8 * 6))
  19           | ((uint64_t) ptr[7] << (8 * 7)));
  20 #else
  21   return word;
  22 #endif
  23 }
  24
  25 /* { dg-final { scan-tree-dump "return word_\[0-9]*\\(D\\);" "optimized" } } */