testprofile on i686

[Robert Helling]

Alan,

> On 5. Dec 2021, at 23:07, Linus Torvalds <torvalds at linux-foundation.org> wrote:
> 
> On Sun, Dec 5, 2021 at 2:03 PM Robert Helling via subsurface
> <subsurface at subsurface-divelog.org> wrote:
>> 
>> depth * 1000.0 / 1000.0 which for a depth of 30m seemed to end up just a tiny bit below 30.
> 
> That implies that we (once again) didn't do proper rounding.
> 
> I suspect just short-circuiting it for zero helium hides the problem
> rather than fixing it.
> 
>          Linus

what does the test program on https://www.cplusplus.com/reference/cfenv/fegetround/ <https://www.cplusplus.com/reference/cfenv/fegetround/> produce on your machine? I am a but afraid to explicitly set the rounding mode just to be sure as that (according to my understanding of the docs I found) might cause the compiler to think we are doing strange stuff.

Best
Robert
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