Dear Samuel,
(I copy this email to the gcc@gcc.gnu.org list, as this is the home for
discussions of this library.)
You can't use the libquadmath library with an ANSI-C compiler. You need a
compiler that supports the __float128 type and operations on it (such as
multiplications, as you mention).
Regards,
FX
> Francois,
>
> I have a question about the GCC Quad-Precision Math Library.
>
> Can I use this library with a regular ANSI-C compiler?
>
> I ask this question because I see in the code (power function)
> that you multiply two 128-bit quad floats using the '*', and I
> could not see how this would work.
>
> -----------------------------------------------------------------------------
> __float128 powq (__float128 x, __float128 y)
> {
> __float128 z, ax, z_h, z_l, p_h, p_l;
> __float128 y1, t1, t2, r, s, t, u, v, w;
> __float128 s2, s_h, s_l, t_h, t_l;
> int32_t i, j, k, yisint, n;
> uint32_t ix, iy;
> int32_t hx, hy;
> ieee854_float128 o, p, q;
> ...
> return s * z; // line 439
> -----------------------------------------------------------------------------
>
> Regards,
> Samuel Stewart
> Scotch Plains, NJ
