On Wed, May 23, 2018 at 3:39 PM Steffen M��rcker <
merkste@web.de> wrote:
Hi Henry,
> [...] it might be possible to try to do this with FFI only?
If I understand you correctly, I could use FFI to call an external lib to��
perform the actual computation according to the rounding mode, right? In��
this case I'd be worry about the performance impact of many FFI calls.
> For the same reason, I hope you intend roundByMethodXWhile: to be a
> mandatory API, forgetting to set the mode back when done (or, never��
> getting
> there due to errors, etc) is an area best left unexplored ;)
I used roundByMethodXWhile: aBlock just to convey the idea that an API��
could work "local" and ensures resetting the rounding mode afterwards. =)
���This quite easy to implement :
LibC>>fegetround
������ ^ self ffiCall: #(int fegetround(void))���
���LibC>>���
fesetround: round
������ ^ self ffiCall: #(void fesetround(int round))
��
���but apparently nothing happens when you do :
LibC uniqueInstance fesetround: 1024.
LibC uniqueInstance fegetround.
always return 0.���