identical to general-purpose Simple-V DD-FFirst...
\end{itemize}
-}
+}Po
\frame{\frametitle{maxloc}
\begin{itemize}
\begin{itemize}
\item Positional popcount adds up the totals of each bit set to 1 in each bit-position, of an array of input values.
\item Notoriously difficult to do in SIMD assembler: typically 550 lines
+
\end{itemize}
\lstinputlisting[language={}]{pospopcount.c}
\begin{center}
\includegraphics[width=0.6\textwidth]{pospopcount.png}
\end{center}
-
+ \begin{itemize}
+ \item The challenge is to perform an appropriate transpose of the data (the CPU can only work on registers, horizontally),
+ in blocks that suit the processor and the ISA capacity.
+
+
+ \end{itemize}
}
\frame{\frametitle{Pospopcount}
\begin{center}
\includegraphics[width=0.6\textwidth]{array_popcnt.png}
\end{center}
+
+ \begin{itemize}
+
+ \item The draft gbbd instruction implements the transpose (shown above),
+ preparing the data to use the standard popcount instruction.
+
+
+ \end{itemize}
}