The main thing that B::C does is output the start-up state of the perl interpreter (post-compilation but before execution) as a bunch of C structs which can be compiled into an executable. This improves the start-up time of the code, but has little effect on the run-time performance - which is still the perl interpreter calling out to a C-level pp_foo() C function for each op in the perl OP tree (the OP tree now being a static structure hard-coded into the executable). There is no JIT compilation to machine code in the Java sense (unless something has changed recently in B::C).
So really there aren't any perl compilers - in the sense of something that at some point (build time or run time) converts perl code into machine code for fast execution.
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