Made compiler/now how to make interpreter faster?

I have used lex and yacc to create a parser which spits out an
bytecode file. The bytecode file is read by the interpreter at a
later time and executed. What are good sources for information on how
to change the bytecode stream/interpreter/compiler for the fastest
executing code? Compared to plain C code the interpreter is much much
slower, about 50-100x for a repeated loop, which seems pretty poor.
[I'd start by profiling your program to make sure you understand where
the slowness is. Once you know where the slowness is, one approach
that's often effective is to add a few specialized bytecodes for frequently
repeated complex tasks. -John]




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