--- a/slides/slides06.tex	Wed Nov 06 23:27:19 2019 +0000
+++ b/slides/slides06.tex	Thu Nov 07 00:07:16 2019 +0000
@@ -373,31 +373,31 @@
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-\begin{frame}[c]
-\frametitle{Operator Precedences}
-
-
-To disambiguate
-
-\begin{center}
-\bl{\begin{tabular}{lcl}
-$\meta{E}$ & $::=$ &  $\meta{E} \cdot + \cdot \meta{E} \;|\;\meta{E} \cdot * \cdot \meta{E} \;|\;( \cdot \meta{E} \cdot ) \;|\;\meta{N}$ \\
-\end{tabular}}
-\end{center}
-
-Decide on how many precedence levels, say\medskip\\
-highest for \bl{$()$}, medium for \bl{*}, lowest for \bl{+}
-
-\begin{center}
-\bl{\begin{tabular}{lcl}
-$\meta{E}_{low}$ & $::=$ & $\meta{E}_{med} \cdot + \cdot \meta{E}_{low} \;|\; \meta{E}_{med}$ \\
-$\meta{E}_{med}$ & $::=$ & $\meta{E}_{hi} \cdot * \cdot \meta{E}_{med} \;|\; \meta{E}_{hi}$\\
-$\meta{E}_{hi}$ & $::=$ &  $( \cdot \meta{E}_{low} \cdot ) \;|\;\meta{N}$ \\
-\end{tabular}}
-\end{center}\pause
-
-\small What happens with \bl{$1 + 3  + 4$}?
-\end{frame}
+%\begin{frame}[c]
+%\frametitle{Operator Precedences}
+%
+%
+%To disambiguate
+%
+%\begin{center}
+%\bl{\begin{tabular}{lcl}
+%$\meta{E}$ & $::=$ &  $\meta{E} \cdot + \cdot \meta{E} \;|\;\meta{E} \cdot * \cdot \meta{E} \;|\;( \cdot \meta{E} \cdot ) \;|\;\meta{N}$ \\
+%\end{tabular}}
+%\end{center}
+%
+%Decide on how many precedence levels, say\medskip\\
+%highest for \bl{$()$}, medium for \bl{*}, lowest for \bl{+}
+%
+%\begin{center}
+%\bl{\begin{tabular}{lcl}
+%$\meta{E}_{low}$ & $::=$ & $\meta{E}_{med} \cdot + \cdot \meta{E}_{low} \;|\; \meta{E}_{med}$ \\
+%$\meta{E}_{med}$ & $::=$ & $\meta{E}_{hi} \cdot * \cdot \meta{E}_{med} \;|\; \meta{E}_{hi}$\\
+%$\meta{E}_{hi}$ & $::=$ &  $( \cdot \meta{E}_{low} \cdot ) \;|\;\meta{N}$ \\
+%\end{tabular}}
+%\end{center}\pause
+%
+%\small What happens with \bl{$1 + 3  + 4$}?
+%\end{frame}
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@@ -672,22 +672,38 @@
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% 
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-\mode<presentation>{
 \begin{frame}[c]
-\frametitle{\begin{tabular}{c}Java Virtual Machine\end{tabular}}
+\frametitle{Java Virtual Machine}
 
 \begin{itemize}
 \item introduced in 1995
 \item is a stack-based VM (like Postscript, CLR of .Net)
-\item contains a JIT compiler
-\item many languages take advantage of JVM's infrastructure (JRE)
+\item contains a JIT compiler\\
+\begin{itemize}
+\item From the Cradle to the Holy Graal - the JDK Story
+\item \url{https://www.youtube.com/watch?v=h419kfbLhUI}
+\end{itemize}
 \item is garbage collected $\Rightarrow$ no buffer overflows
 \item some languages compile to the JVM: Scala, Clojure\ldots
 \end{itemize}
 
-\end{frame}}
+\end{frame}
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   
 
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+\begin{frame}[c]
+\frametitle{LLVM}
+
+\begin{itemize}
+\item LLVM started by academics in 2000 (University of Illinois in 
+Urbana-Champaign)
+\item suite of compiler tools
+\item SSA-based intermediate language
+\item no need to allocate registers
+\end{itemize}  
+\end{frame}
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%   
+  
 
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %\begin{frame}[c]