gcc/testsuite/gcc.dg/tree-ssa/pr96239.c

   1 /* PR tree-optimization/96239 */
   2 /* { dg-do compile { target { ilp32 || lp64 } } } */
   3 /* { dg-options "-O3 -fdump-tree-optimized" } */
   4 /* { dg-final { scan-tree-dump " r>> 8;" "optimized" { target bswap } } } */
   5
   6 union U { unsigned char c[2]; unsigned short s; };
   7
   8 unsigned short
   9 foo (unsigned short x)
  10 {
  11   union U u;
  12   u.s = x;
  13   unsigned char v = u.c[0];
  14   unsigned char w = u.c[1];
  15   u.c[0] = w;
  16   u.c[1] = v;
  17   return u.s;
  18 }