You can read about controlling the floating point environment:

https://docs.factorcode.org/content/article-math.floats.env.html

including the rounding mode here:

https://docs.factorcode.org/content/word-with-rounding-mode%2Cmath.floats.env.html




> On Nov 23, 2019, at 3:06 AM, Sanjay Jain via Factor-talk 
> <factor-talk@lists.sourceforge.net> wrote:
> 
> In Factor, is there any means to set the roundoff mode of x87 FPU? If not 
> what is the default mode used in floating point computation?
> 
> Sanjay Jain
> 
> 
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