Re: floating point precision control

[John W. Eaton]

On 07/10/2016 03:48 PM, Mike Miller wrote:
> jwe, all,

> We still have a couple possibly-related bugs, that the same tests that
> were failing on Windows with a 32-bit Octave also fail with a 64-bit
> Octave, and the FP control word setting doesn't seem to affect it at all
> in this case (bugs #48364 and #48365).

Isn't the FP control word and extended precision specific to x86 hardware?

Did you look at this mailing list thread?  I've only started to read it.

  http://lkml.iu.edu/hypermail/linux/kernel/0103.0/0453.html

Maybe we should just try to do the best we can with 64-bit IEEE 
arithmetic and not try to use extended precision since it is impossible 
to always use 80-bit precision everywhere (intermediate values may be 
stored in 64-bit memory locations, for example) and a mixture of 64- and 
80-bit arithmetic seems like it may be asking for unpredictable results?

jwe