1  /* { dg-do assemble { target { ! ia32 } } } */
       2  /* { dg-require-effective-target avx512f } */
       3  /* { dg-options "-O2 -mavx512f" } */
       4  
       5  #include <immintrin.h>
       6  
       7  register __m512d z asm ("zmm16"); /* { dg-warning "call-clobbered register used for global register variable" } */
       8  
       9  __m128d foo ()
      10  {
      11    return _mm256_extractf128_pd (_mm512_extractf64x4_pd(z, 0), 1);
      12  }