Inline assembler can't return 64-bit values in registers

[Alan Modra]

On Wed, 6 Dec 2000, Timur Tabi wrote:

> which basically assumes that the compiler will use edx:eax as the return value.
> Converting this to gcc appears to be impossible.

Unless you know about the `A' constraint.  Try this:

    register u64 temp1;

    __asm__ __volatile__ (
        "movq (%1), %%mm0\n\t"
        "movd %%mm0, %%eax\n\t"
        "punpckhdq %%mm0, %%mm0\n\t"
        "movd %%mm0, %%edx"
        : "=A" (temp1)
        : "r" (pInput)
    );

    return temp1;

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