libispack3 for Debian
---------------------

This package provides multiple optimized versions of the library
for the x86_64 architecture using the Debian alternatives system.

On x86_64 systems, the library files are located in:
  /usr/lib/x86_64-linux-gnu/ispack/

The available variants are:
  1. fort   (Generic implementation, written in Fortran) - Default
  2. avx    (Optimized for AVX instruction set)
  3. fma    (Optimized for FMA instruction set)
  4. avx512 (Optimized for AVX-512 instruction set)

If you are running on hardware that supports advanced instruction sets,
you can manually switch the library version.

To switch the runtime library (libispack3.so.3):
    sudo update-alternatives --config libispack3

To switch the development files (libispack3.so and libispack3.a):
    sudo update-alternatives --config libispack3-dev

On non-x86_64 architectures, only the standard 'fort' version is provided
in the standard library path, and the alternatives system is not used.

 -- Youhei SASAKI <uwabami@gfd-dennou.org>, Fri,  9 Jan 2026 13:28:45 +0900
