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

From: John Maddock (john_at_[hidden])
Date: 2006-10-12 11:30:01

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

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

0         00 00 00 00 00 00 00 00
sn. min   01 00 00 00 00 00 00 00
n. min    00 00 00 00 00 00 10 00
1         00 00 00 00 00 00 f0 3f
4/3       55 55 55 55 55 55 f5 3f
max       ff ff ff ff ff ff ef 7f
inf       00 00 00 00 00 00 f0 7f
q. nan    00 00 00 00 00 00 f8 7f
s. nan    00 00 00 00 00 00 f4 7f
-1        00 00 00 00 00 00 f0 bf

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

0         00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
sn. min   01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
n. min    00 00 00 00 00 00 00 00 00 00 00 00 00 00 01 00
1         00 00 00 00 00 00 00 00 00 00 00 00 00 00 ff 3f
4/3       55 55 55 55 55 55 55 55 55 55 55 55 55 55 ff 3f
max       ff ff ff ff ff ff ff ff ff ff ff ff ff ff fe 7f
inf       00 00 00 00 00 00 00 00 00 00 00 00 00 00 ff 7f
q. nan    00 00 00 00 00 00 00 00 00 00 00 00 00 80 ff 7f
s. nan    00 00 00 00 00 00 00 00 00 00 00 00 00 40 ff 7f
-1        00 00 00 00 00 00 00 00 00 00 00 00 00 00 ff bf

And for completeness, HP-UX on PA-RISC:

maddock_at_td191> aCC -AA -I ~ *.cpp
maddock_at_td191> ./a.out

big endian

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    7f a0 00 00
s. nan    7f c0 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    7f f4 00 00 00 00 00 00
s. nan    7f f8 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 00 00 00 00 00 00 00 00
sn. min   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 01
n. min    00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00
1         3f ff 00 00 00 00 00 00 00 00 00 00 00 00 00 00
4/3       3f ff 55 55 55 55 55 55 55 55 55 55 55 55 55 55
max       7f fe ff ff ff ff ff ff ff ff ff ff ff ff ff ff
inf       7f ff 00 00 00 00 00 00 00 00 00 00 00 00 00 00
q. nan    7f ff 40 00 00 00 00 00 00 00 00 00 00 00 00 00
s. nan    7f ff 80 00 00 00 00 00 00 00 00 00 00 00 00 00
-1        bf ff 00 00 00 00 00 00 00 00 00 00 00 00 00 00

HTH, John.