As we said in “Math Libraries and System Architecture”, the main HP-UX math libraries, libm
and libcl, are
provided in a version targeted to the PA-RISC 1.1 and PA-RISC 2.0
architectures.
The two HP Fortran products also provide a version of the
BLAS library, libblas,
that is specially tuned to the PA2.0 narrow-mode architecture. If
you are compiling code that will run only on PA2.0 systems, use
this library for optimum performance. If you use the +DA2.0
option and link in the BLAS library, you will automatically link
in the PA2.0 version.
See Chapter 4 “HP-UX Math Libraries on HP 9000
Systems” for more
information about math libraries. See “Determining Your System's
Architecture Type” if you do not know what kind of system
you have.
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