quad precision question

[Stu Anderson 425-865-3595]

Is this list alive?  If so, I have a question.

When I run various Fortran 90/95 compilers with
   selected_real_kind(p=24),
I get the following results:

              radix digits minexponent maxexponent

HP              2    113      -16381       16384
Sun             2    113      -16381       16384

RS6000          2    106        -968        1024
SGI             2    107        -915        1023

Note: for IEEE double, the four numbers are (2 53 -1021 1024).

The HP and the Sun are using what could be called IEEE Quad.
The RS6000 and the SGI are using two IEEE doubles.

Why are the RS6000 and SGI numbers different?

--Stu Anderson
_______________________________________________________________
stu.andersonaboeing.com -- Mathematics and Computing Technology
http://www.rt.cs.boeing.com/MEA/comp_math/sla/
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