Changed the handling of variadic intrinsics a bit. Removed the -fp80 option and made real be 80bit floats on X86, this is what the D spec really says it should be and fixes a bunch of issues. Changed the handling of parameter attributes to a bit more generalized approach. Added sext/zext attributes for byte/short/ubyte/ushort parameters, fixes #60 . Parameter attribs now properly set for intrinsic calls if necessary. Made the tango.math.Math patch less intrusive. Fixed/added some mini tests.

module union5;

union S
{
    T t;
    U u;
    uint i;
    struct {
        ushort sl,sh;
    }
}

struct T
{
    int i;
}

struct U
{
    float f;
}

void main()
{
    S s;
    assert(s.t.i == 0);
    assert(s.u.f == 0);
    s.t.i = -1;
    assert(s.i == 0xFFFF_FFFF);
    float f = 3.1415;
    s.u.f = f;
    uint pi = *cast(uint*)&f;
    assert(s.i == pi);
    assert(s.sl == (pi&0xFFFF));
    assert(s.sh == (pi>>>16));
}