Add subcircuit match perf section

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Théophile Bastian 2017-08-26 01:39:03 +02:00
parent f30d695832
commit 7167edeb7b
4 changed files with 48 additions and 0 deletions

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@ -5,3 +5,6 @@ all:
upload:
scp report.pdf www.tobast:~/tobast.fr/public_html/m1/internship.pdf
upload-alt:
scp report.pdf www.tobast:~/tobast.fr/public_html/m1/internship.tmp.pdf

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report/img/mux_of_tri.png Normal file

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digraph mux {
rankdir = LR;
if0 [shape=triangle, orientation=270];
if1 [shape=triangle, orientation=270];
prenot [shape=point, width=0];
not [shape=triangle, orientation=180];
in0 [shape=point];
sel [shape=point];
in1 [shape=point];
preout [shape=point, width=0];
out [shape=point, label=out];
edge [weight=1];
sel -> prenot [label=select, arrowhead=none];
prenot -> if1 [arrowhead=normal, tailport=s, headport=n];
prenot -> not [headport=n];
in0 -> if0 [label=in0, headport=w];
in1 -> if1 [label=in1, headport=w];
if0 -> preout [tailport=e, arrowhead=none];
if1 -> preout [tailport=e, arrowhead=none];
preout -> out [label=out];
not -> if0 [weight=42, headport=n, tailport=s, arrowtail=invodot];
{rank=same; sel ; in0 ; in1; }
{rank=same; if0 ; if1; prenot; not;}
}

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@ -761,7 +761,19 @@ the memoized results (essentially the signatures) are kept for the second one,
considerably speeding it up: the same program proving only one way takes about
\textbf{475\,ms}. \todo{explain why}
\paragraph{Match.} The subcircuit match feature was tested by trying to find
every occurrence of a pattern that can be easily found using tools like
\lstbash{grep}. For this purpose, the ad-hoc implementation of a MUX gate was
used: two tristate gates and a NOT gate, as in Figure~\ref{fig:mux_of_tri}.
\begin{figure}[h]
\centering
\includegraphics[height=6cm]{img/mux_of_tri.png}
\caption{MUX gate made out of tristate and not gates}\label{fig:mux_of_tri}
\end{figure}
This group appears 73 times in the processor. To match them all (none are
overlapping), it takes \textbf{\qtodo{todo}\,ms}.
\subsection{Corner cases}\label{ssec:corner_cases}