gcc/testsuite/gcc.target/i386/pr85417-1.c

/* { dg-do compile } */
/* { dg-require-ifunc "" } */
/* { dg-options "-O3 -fcf-protection" } */
/* { dg-final { scan-assembler "vpshufb" } } */
/* { dg-final { scan-assembler "punpcklbw" } } */

__attribute__((target_clones("arch=core-avx2","arch=slm","default")))
void
foo(char *in, char *out, int size)
{
  int i;
  for(i = 0; i < size; i++)
    {
	out[2 * i] = in[i];
	out[2 * i + 1] = in[i];
    }
}