Suddenly this started failing in the test suite. The failing code is extracted from runnable/testxmm.d:

------------------------------------
import core.simd;
import core.stdc.string;
import core.stdc.stdio;

version (D_AVX)
{
    void foo_byte32(byte t, byte s)
    {
        byte32 f = s;  (***)
        auto p = cast(byte*)&f;
        foreach (i; 0 .. 32)
	{
	    printf("[%d]: %d\n", i, p[i]);
            assert(p[i] == s);
	}
    }

    void main()
    {
        foo_byte32(5, -10);
    }
}

The (***) is where the problem is, the MOVDQA instruction generated should be VMOVDQA.