Added support for using a temporary to implement emulated ABI return from inline asm, could be easier to use, but I think this will do. It's so extremely target dependent in any case that doing a completely generic approach seems hard.

module sqrts;

import tango.stdc.math;

double sqrt(double d)
{
    return tango.stdc.math.sqrt(d);
}

void main()
{
}