gcc/testsuite/gcc.dg/pr96573.c

   1 /* PR tree-optimization/96573 */
   2 /* { dg-do compile { target { lp64 || ilp32 } } } */
   3 /* { dg-require-effective-target bswap } */
   4 /* { dg-options "-O3 -fdump-tree-optimized" } */
   5 /* { dg-final { scan-tree-dump "__builtin_bswap\|VEC_PERM_EXPR\[^\n\r]*7, 6, 5, 4, 3, 2, 1, 0" "optimized" { xfail vect_variable_length } } } */
   6
   7 typedef __SIZE_TYPE__ size_t;
   8
   9 void *
  10 foo (void * const p)
  11 {
  12   const size_t m = sizeof (p) - 1;
  13   const unsigned char * const o = (unsigned char*) &p;
  14   void *n;
  15   unsigned char * const q = (unsigned char *) &n;
  16   unsigned char i;
  17   for (i = 0; i <= m; ++i)
  18     q[m - i] = o[i];
  19   return n;
  20 }