https://github.com/epiqc/ScaffCC
Tip revision: c9bb19c5906c44795fde065e4a9c6b1e92c04968 authored by EPiQC on 06 August 2017, 15:43:30 UTC
Merge branch 'master' of https://github.com/epiqc/ScaffCC
Merge branch 'master' of https://github.com/epiqc/ScaffCC
Tip revision: c9bb19c
chapter-expand.tex
\chapter{Expanding ScaffCC}\label{ch:expand}
ScaffCC is completely open-source and may be expanded to accomodate future needs of quantum circuit analysis and optimization.
At the core of ScaffCC are the LLVM compiler passes, which operate on LLVM IR (.ll) code. All LLVM passes are stored in:
\begin{lstlisting}
llvm/lib/Transforms/
\end{lstlisting}
Passes specific to ScaffCC are stored in:
\begin{lstlisting}
llvm/lib/Transforms/Scaffold
\end{lstlisting}
In general, to run a pass in LLVM, you invoke the opt program as follows:
\begin{lstlisting}
build/Release+Asserts/bin/opt -S -load build/Release+Asserts/lib/Scaffold.so {pass_name} {input_ll_file} > {output_ll_file} 2> {log_file}
\end{lstlisting}
Note that ${pass\_name}$ referes to the unique name of the pass by which it is registered in the LLVM system, by invoking the following in the implementation of the pass:
\begin{lstlisting}
static RegisterPass<{pass_name}> X({pass_name}, {description_of_functionality});
\end{lstlisting}
To write a new pass, start by looking at the previously implemented examples in this directory, and consulting the LLVM Documentation:
\url{http://llvm.org/docs/WritingAnLLVMPass.html}