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 assign;

// this is taken from std.intrinsic from gdc

int mybtc(uint *p, uint bitnum)
{
    uint * q = p + (bitnum / (uint.sizeof*8));
    uint mask = 1 << (bitnum & ((uint.sizeof*8) - 1));
    int result = *q & mask;
    *q ^= mask;
    return result ? -1 : 0;
}

void main()
{
    uint i = 0xFFFF_FFFF;
    int r = mybtc(&i, 31);
    assert(r);
    assert(i == 0x7FFF_FFFF);
    r = mybtc(&i, 31);
    assert(!r);
    assert(i == 0xFFFF_FFFF);
}