Re: POSIX and float rounding

[Guy Harris <gharris () sonic net>]

On Mar 19, 2026, at 9:30 AM, Denis Ovsienko <denis () ovsienko info> wrote:

> On Thu, 19 Mar 2026 09:16:47 -0700
> Guy Harris <gharris () sonic net> wrote:
>
> > Try that on the platforms in question and see what it reports.
>
> $ ./roundingmode 
> Rounding mode: to nearest
>
> fenv.h defines exactly the four FE_ rounding modes.

So that's true on *all* of the platforms, including QNX?

That's annoying. It appears that QNX's definition of "to nearest", in the "the two choices are equidistant" case, is 
different from that of all other platforms (and from what I guess I was taught in school, as I've always thought you 
were supposed to round 0.5 up to 1).

Perhaps it's time to see what IEEE 754 has to say on the topic.
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