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

From: John Maddock (john_at_[hidden])
Date: 2006-11-09 08:44:18

Johan Råde wrote:

> That is weird.
> Can you run the inspect tool (fpclassify/tools/inspect/inspect.cpp)
> on Win32 / Intel 7?

I don't think it differs from any other Win32 compiler:

This platform is little-endian.
BOOST_LITTTLE_ENDIAN is defined.

---------- float --------------------

0         00 00 00 00
sn. min   00 00 00 01
n. min    00 80 00 00
1         3f 80 00 00
4/3       3f aa aa ab
max       7f 7f ff ff
inf       7f 80 00 00
q. nan    ff c0 00 00
s. nan    ff 80 00 00
-1        bf 80 00 00

---------- double -------------------

0         00 00 00 00 00 00 00 00
sn. min   00 00 00 00 00 00 00 01
n. min    00 10 00 00 00 00 00 00
1         3f f0 00 00 00 00 00 00
4/3       3f f5 55 55 55 55 55 55
max       7f ef ff ff ff ff ff ff
inf       7f f0 00 00 00 00 00 00
q. nan    ff f8 00 00 00 00 00 00
s. nan    ff f0 00 00 00 00 00 00
-1        bf f0 00 00 00 00 00 00

---------- long double --------------

0         00 00 00 00 00 00 00 00
sn. min   00 00 00 00 00 00 00 01
n. min    00 10 00 00 00 00 00 00
1         3f f0 00 00 00 00 00 00
4/3       3f f5 55 55 55 55 55 55
max       7f ef ff ff ff ff ff ff
inf       7f f0 00 00 00 00 00 00
q. nan    ff f8 00 00 00 00 00 00
s. nan    ff f0 00 00 00 00 00 00
-1        bf f0 00 00 00 00 00 00

John.