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\section{Back End Optimizations}
Once MLRisc trees have been generated, they are passed into a module
that generates a flowgraph of target machine instructions. Again,
this module and all subsequent optimization phases have been
specialized to the front end.
\image{Back end optimizations}{pictures/png/optimization.png}{align=right}
Nearly all
instruction selection modules provided by MLRISC use a simple tree
pattern matching algorithm rather than the more heavy weight BURG
tools --- including the x86 \begin{color}{#580000} It is important to
emphasis that all optimizations are performed on the flowgraph of
target machine instructions and \emph{not} MLRisc
immediate IR. \end{color} There is complete flexibility in the order,
and nature of the optimizations performed.
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