llvm-gcc-4.2/gcc/testsuite/gcc.target/powerpc/rotate.c

/* LLVM LOCAL */
/* { dg-do compile } */
/* { dg-options "-O2" } */
/* { dg-final { scan-assembler-not "slwi" } } */
unsigned int foo (unsigned int x)
{
  return ((x >> 16) & 0xffff) | ((x & 0xffff) << 16);
}