gcc/testsuite/gcc.target/i386/pr42589.c

   1 /* { dg-do compile } */
   2 /* { dg-require-effective-target ia32 } */
   3 /* { dg-skip-if "" { i?86-*-* x86_64-*-* } { "-march=*" } { "-march=i486" } } */
   4 /* { dg-options "-O2 -march=i486" } */
   5
   6 void
   7 foo (unsigned long long *p)
   8 {
   9   unsigned long long tmp;
  10   tmp = *p;
  11   tmp = (tmp >> 32) | (tmp << 32);
  12   tmp = (((tmp & 0xff00ff00ff00ff00ULL) >> 8)
  13          | ((tmp & 71777214294589695ULL) << 8));
  14   *p = (((tmp & 0xffff0000ffff0000ULL) >> 16)
  15         | ((tmp & 281470681808895ULL) << 16));
  16 }
  17
  18 /* { dg-final { scan-assembler-times "bswap" 2 } } */