On Tue, Nov 16, 2021 at 02:01:47AM +0000, Koning, Paul via Gcc-patches wrote: > > > > On Nov 15, 2021, at 8:48 PM, Marek Polacek via Gcc-patches > > <gcc-patches@gcc.gnu.org> wrote: > > > > Nitpicking time. It's spelled "ones' complement" rather than "one's > > complement". > > Is that so? I see Wikipedia claims it is, but there are no sources for that > claim. (There is an assertion that it is "discussed at length on the talk > page" of an article about number representation, but in fact there is no > discussion there at all.) > > I have never seen this spelling before, and I very much doubt its validity. > For one thing, why then have "two's complement"? For another, to pick one > random authority, J.E. Thornton in "Design of a computer -- the Control Data > 6600" refers to "one's complement" to describe the well known mode used by > that machine and its relatives.
Knuth, The Art of Computer Programming Volume 2, page 203-4: "A two's complement number is complemented with respect to a single power of 2, while a ones' complement number is complemented with respect to a long sequence of 1s." Marek
