Re: [boost] Optimized portable isnan, isfinite, fpclassify etc

From: Johan Råde (rade_at_[hidden])
Date: 2006-10-12 11:52:31

John Maddock wrote:
> Johan Råde wrote:
>>> John,
>>>
>>> I am a bit baffled with the results from your HP-UX/Itanium tests.
>>>
>>> Could you run the attached program on that machine?
>>> It is just a single cpp file.
>>> It prints the byte patterns of various numbers.
> 
> Here we go, HP-UX on itanium:
> 
> maddock_at_td176> aCC -AA -I ~ *.cpp
> maddock_at_td176> ./a.out
> 
> little endian
> 
> float -------------------------------
> 
> 0         00 00 00 00
> sn. min   01 00 00 00
> n. min    00 00 80 00
> 1         00 00 80 3f
> 4/3       ab aa aa 3f
> max       ff ff 7f 7f
> inf       00 00 80 7f
> q. nan    00 00 c0 7f
> s. nan    00 00 a0 7f
> -1        00 00 80 bf
> 
> 

The problem is <boost/endian.hpp>.
According to <boost/detail/endian.hpp> the platform is little endian.
But it is clearly big endian.

--Johan