Re: Two suggestions for gcc C compiler to extend C language (by WD Smith)

[Andrew Haley]

On 26/07/16 14:31, Warren D Smith wrote:
> However, why not provide access to double-precision multiply and
> add-with-carry (subtract with borrow? shift-left?) in the same fashion?
>    twofer  x = mul(a,b);  would cause  x.hi and x.lo  to be computed.
>    twofer  x = addwithcarry(a,b)   ditto.

unsigned __int128 poo(unsigned long a, unsigned long b) {
  return (__int128)a * b;
}

unsigned __int128 bar(unsigned __int128 a, unsigned long b) {
  return a + b;
}

Andrew.