Floating point failures on x64

[Daniel Murphy]

I've been trying to fix issue 4155, but it's a little difficult without the 
ability to test on x64 (I'm on win32).  Could anybody compile the following 
code for me with 'dmd -m64' with this patch 
https://github.com/D-Programming-Language/dmd/pull/760 and send me the 
disassembly?

Thanks.


template TT4155(T...) { alias T TT4155; }

void test4155()
{
    static int test4155a()
    {
        T getnan(T)() { return T.nan; } // OPcall
        static T getnanu(T)() { return T.nan; } // OPucall

        foreach(T; TT4155!(float, double, real, ifloat, idouble, ireal, 
cfloat, cdouble, creal))
        {
            auto f = getnan!T();
            if (!__ctfe) // force f into memory
                asm { nop; };

            assert(!(T.nan == 0), T.stringof);
            assert(!(f == 0), T.stringof);
            assert(!(getnan!T == 0), T.stringof);
            assert(!(getnanu!T == 0), T.stringof);

            assert((T.nan != 0), T.stringof);
            assert((f != 0), T.stringof);
            assert((getnan!T != 0), T.stringof);
            assert((getnanu!T != 0), T.stringof);
        }
        return 1;
    }
    auto a = test4155a();
    enum b = test4155a();
}

void main()
{
    test4155();
}