Re: 5.1 rc mod giving -0 (never just 0)

[Rici Lake <lua@...>]

On 22-Jan-06, at 7:32 PM, D Burgess wrote:

> On 1/23/06, Rici Lake <lua@ricilake.net> wrote:
>
> > In any event, if you compile lua (or at least lvm.c) with the option
> > -mno-fused-madd, then you'll get 0 rather -0. (Or you could redefine
> > luai_nummod in terms of fmod and copysign.)
>
> Hi Rici,
>
> It seems to me that this is important enough that it should be in
> the lua manual.

Or fixed :) It's not the only problem with %:

> for i = 50, 70 do io.write(2^i % 3, " ") end; io.write"\n"
1 2 1 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
> for i = 50, 70 do io.write(math.fmod(2^i, 3), " ") end; io.write"\n"
1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1