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Re: Round-to-even without modifying rounding mode?


On 05 Feb 2015 11:51, Matt Turner wrote:
> The rint() family of functions with the rounding mode set to
> FE_TONEAREST is the only libc function I can find that will do
> round-to-even. round() rounds half away from zero.
> 
> By setting various rounding modes rint() can do floor/ceil/trunc, but
> there doesn't seem to be function that simply does round-to-even. Is
> there one I've missed?
> 
> Alternatively, the reservations I have about setting the rounding mode
> come from vague ideas about high costs involved with doing so and
> potential problems from changing the rounding mode in a library. Are
> either of these concerns valid, or should I simply save and restore
> the rounding mode around a call to rint() to get round-to-even
> behavior?

adding Joseph as i'm not sure he's subscribed to this group
-mike

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