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Subject: Seeking numerical package for quadruple precision...
Date: Tue, 3 Jul 2007 18:33:45 -0700
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Hi all,

I have some computation and simulation which need quadruple precision. I 
mean, the double precision is not enough, while high precision such as 1000 
digits is not needed, and that's too slow. I guess quadruple precision 
exactly fits my problem and should be much faster than double precision.

Could anybody tell me if MS Visual C++, or Intel C, Intel Fortran have 
already got quadruple precision in them and they are fully supported on 
Intel based cpus? I guess Intel Fortran has quadruple precision, but since I 
prefer C/C++ so my first choices are within C/C++ languages.

Moreover, do GSL, Intel MKL, and IMSL etc. have got quadruple precision 
support? I only need +, -, *, /, exp, and log.

I eventually have to do everything in C/C++ so I am primarily looking for 
numerical libraries, instead of Matlab or Maple or Mathematica's symbolic 
capability.

But if you know how to "simulate" quadruple precision in Matlab or Maple, or 
Mathematica, in order to see if an algorithm will overslow when converting 
into C/C++/Fortran, please let me know. I want to do the algorithm design in 
Matlab, and test if it will overflow, before converting everything into 
C/C++/Fortran.

If you know how to "simulate" quadruple precision in Matlab, Maple or 
Mathematica even with the symbolic toolbox, please let me know too... this 
is for algorithm design and testing...

Moreover, are there popular quadruple precision packages? Please recommend 
the fastest one. I am really in huge need of speed.

Thank you very much!