Re: Other Quesa concerns/suggestions

[Sean M. <se...@ro...>]

On 4/27/09 9:20 AM, James W. Walker said:

>> At least nan, inf, etc. do not work (correctly) when __FAST_MATH__  
>> is on.
>
>Please tell me more.  How do they work differently when it is off?

The gcc man page does discuss this somewhat.  It says:

"-ffast-math
Sets -fno-math-errno, -funsafe-math-optimizations, -fno-trapping-math, -
ffinite-math-only, -fno-rounding-math, -fno-signaling-nans and fcx-
limited-range."

Then for -ffinite-math-only it says:

"Allow optimizations for floating-point arithmetic that assume that
arguments and results are not NaNs or +-Infs."

-- 
____________________________________________________________
Sean McBride, B. Eng                 se...@ro...
Rogue Research                        www.rogue-research.com 
Mac Software Developer              Montréal, Québec, Canada