[Bug middle-end/28796] __builtin_nan() and __builtin_unordered() inconsistent

[iano at apple dot com]

------- Comment #9 from iano at apple dot com  2006-08-22 00:49 -------
Subject: Re:  __builtin_nan() and __builtin_unordered() inconsistent


On Aug 21, 2006, at 5:42 PM, pinskia at physics dot uc dot edu wrote:

>
>
> ------- Comment #8 from pinskia at physics dot uc dot edu   
> 2006-08-22 00:42 -------
> Subject: Re:  __builtin_nan() and __builtin_unordered() inconsistent
>
>> Which part of:
>>
>> __builtin_isunordered(nan,nan) = 1
>> __builtin_isnan(nan) = 0
>>
>> is consistent?
>
> Did you read what the options do because it seems like you did not  
> and you keep
> on agruing that
> it is inconsistent except for the fact this is way these options  
> are done as it
> just says "allows for
> optimizations" and not always assume finite math and ignore NaNs  
> all the time.

Yes, I did.  All one sentence of it:

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

Do you know what an unordered compare is?

Ian


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28796