1  /* { dg-do compile } */
       2  /* { dg-options "-O -ffast-math -msse2 -fdump-tree-optimized" } */
       3  
       4  #include <emmintrin.h>
       5  
       6  int f(__m128d x){
       7    x = _mm_sub_pd (x, x);
       8    x = _mm_mul_pd (x, x);
       9    double r = 42;
      10    _mm_storeh_pd (&r, x);
      11    int z = r == 0;
      12    return __builtin_constant_p (z) && z;
      13  }
      14  
      15  /* { dg-final { scan-tree-dump "return 1;" "optimized" } } */