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bli_arch_query_id() is used to select kernels in optimized BLAS APIs. Previous implementation incurred the overhead of multiple function calls. This has been reduced by: - Changing the function to be defined in a header file so it can be inlined. - Avoiding call to bli_arch_check_id_once that was a wrapper for a call to bli_pthread_once. Instead bli_pthread_once is called directly. - For builds with a single BLIS sub-configuration, correct arch_id is taken directly from a header file in the corresponding config subdirectory, avoiding the bli_pthread_once call and making the value explicit at compile time, which may enable additional optimizations. To enable these changes, the variables arch_id and model_id defined in frame/base/bli_arch.c are no longer static, as they must be accessed in multiple files (i.e. they are now global variables). Rename to g_arch_id and g_model_id to distinguish from any locally defined arch_id or model_id variables.
For more information on sub-configurations and configuration families in BLIS, please read the Configuration Guide, which can be viewed in markdown-rendered form from the BLIS wiki page.
If you don't have time, or are impatient, take a look at the config_registry
file in the top-level directory of the BLIS distribution. It contains a
grammar-like mapping of configuration names, or families, to sub-configurations,
which may be other families. Keep in mind that the / notation:
<config>: <config>/<name>
means that the kernel set associated with <name> should be made available to
the configuration <config> if <config> is targeted at configure-time.
(Some configurations borrow kernels from other configurations, and this is how
we specify that requirement.)