Using pre-compiled libraries

When using the -fast option, if the source code is unavailable for any of the modules referenced in a design, then you must search libraries for the precompiled modules using the -L or -Lf argument to vlog. The compiler optimizes pre-compiled modules the same as if the source code is available. The optimized code for a pre-compiled module is written to the same library in which the module is found.

The compiler automatically searches libraries specified in the `uselib directive (see Verilog-XL `uselib compiler directive). If your design exclusively uses `uselib directives to reference modules in other libraries, then you don't need to specify library search options to the compiler.

Note: If you use -L or -Lf with the compiler, you must also you use them with vsim when you simulate the design.

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