Re: [Libmesh-users] [libmesh-users] libmesh build error with complex numbers

[Kirk, B. (JSC-EG311) <ben...@na...>]

Cody -

I'd definitely be interested in getting that code and making it something optional we can turn on from LibMeshInit.

Thanks,

-Ben


On Jul 26, 2012, at 4:36 PM, "Cody Permann" <cod...@gm...> wrote:

> On Thu, Jul 26, 2012 at 3:25 PM, Roy Stogner <roy...@ic...>wrote:
> 
>> 
>> On Thu, 26 Jul 2012, Roy Stogner wrote:
>> 
>>> I do like the idea of keeping this as a debug-mode check, but in that
>>> case, could we just check for 0 directly rather than with that weird
>>> "abs-less-than-min" construction, even in the Number==Real case?
>> 
>> Alternatively, we could go nuts: in the LibMeshInit constructor, use
>> fegetenv()/fesetexceptflag()/fesetenv() to turn on hardware floating
>> point exceptions, for every arithmetic operation, everywhere.  That
>> ought to be more efficient per-test, in both software and speed, than
>> using if(); and it ought to be much more thorough.
>> 
> 
> Yeah we take a mixed approach in our software,  We have a small set of
> utility functions that we call to toggle the hardware flags but only in
> Debug mode.  We wrap routines of interest with calls to those utility
> functions.  The code for Mac/Linux is quite different for turning these
> flags on/off so let us know if you decide to go this direction.  We can
> supply the Apple system calls as needed.
> 
>> 
>> I don't think I'd want this on by default (see the previous discussion
>> re: Ben and applications relying on NaN tests) but it might be a nice
>> command-line option.
> 
> 
> Yes agreed, probably not the desired default behavior.
> Cody
> 
> 
>> 
> 
> ---
>> Roy
>> 
>> 
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