BLIS currently only allows building support for one architecture (configuration) at a time. In the future, it should allow the user to build support for multiple architectures into the same library. The "correct" architecture will then be selected at runtime according to some method. That method could be CPUID or an equivalent, or it could be set to a default in some other way and then later manually changed by the user. Ideally, runtime kernel management should even allow the user to link his own kernel files at link-time, which he can then switch to using the same procedure for switching among the pre-defined architectures.
This feature will require substantial changes to the build system, primarily configure, Makefile, and the make_defs.mk files. It will also redefine what we think of as a configuration and require a reorganization (and renaming) of the files in the top-level kernels directory. A registry will be needed to associate actual configuration names (e.g. haswell) with multi-architecture configurations aliases (e.g., intel64). Finally, it will require a change to the reference kernel files (as well as a relocation) so that their names can be mangled according to the targeted architecture, allowing us to build one set of reference kernels per supported configuration.
jeffhammond and ShadenSmith
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