bug 1244: add video link to ddffirst talk

[libreriscv.git] / conferences / fosdem2024 / fosdem2024_ddffirst / fosdem2024_ddffirst.tex

diff --git a/conferences/fosdem2024/fosdem2024_ddffirst/fosdem2024_ddffirst.tex b/conferences/fosdem2024/fosdem2024_ddffirst/fosdem2024_ddffirst.tex
index 30c79c5f91fa402e4fa499d96a4ef33ac4f11952..06687c5c7095096f9836e46a718a137cbf0a0781 100644 (file)
--- a/conferences/fosdem2024/fosdem2024_ddffirst/fosdem2024_ddffirst.tex
+++ b/conferences/fosdem2024/fosdem2024_ddffirst/fosdem2024_ddffirst.tex
@@ -109,7 +109,8 @@ for (i = 0; i < VL; i++)
   \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
-    \item https://github.com/clausecker/pospop
+    \item https://github.com/clausecker/pospop - Full writeup: \\
+          https://libre-soc.org/openpower/sv/cookbook/pospopcnt
 
    \end{itemize}
 
@@ -217,11 +218,30 @@ for (i = 0; i < VL; i++)
 }
 
 \frame{\frametitle{maxloc}
+    \lstinputlisting[language={}]{maxloc.py}
+
        \begin{itemize}
-               \item "TODO
+               \item FORTRAN MAXLOC - find the index of largest number
+                     notoriously difficult to optimally implement for SIMD
+               \item algorithms include \textit{depth-first} recursive
+                     descent (!) mapreduce-style, offsetting the
+                     locally-computed largest index (plus value) which
+                     are then tested in upper level(s)
+               \item SVP64: note below the sv.cmp (first while-loop),
+               sv.minmax. (second while-loop) and the sv.crnand which
+               by Predicate masking is 3-in 1-out CR ops
+               not the usual 2-in 1-out
+               \item There is however quite a bit of "housekeeping".
+                       Full analysis: \\
+       https://libre-soc.org/openpower/sv/cookbook/fortran\_maxloc
        \end{itemize}
 }
 
+\frame{\frametitle{maxloc assembler}
+       
+       \lstinputlisting[language={}]{maxloc.s}
+}
+
 \frame{\frametitle{Summary}
 
  \begin{itemize}
@@ -249,17 +269,19 @@ for (i = 0; i < VL; i++)
 
 \frame{
   \begin{center}
-    {\Huge The end\vspace{12pt}\\
+    {\Huge The end\vspace{1pt}\\
            Thank you\vspace{12pt}
     }
   \end{center}
 
   \begin{itemize}
+       \item Video of this talk https://youtu.be/fxClvuc2-f8 
     \item Discussion: http://lists.libre-soc.org
     \item OFTC.net IRC \#libre-soc
     \item http://libre-soc.org/
        \item https://nlnet.nl/project/Libre-SOC-OpenPOWER-ISA
 \item https://bugs.libre-soc.org/show\_bug.cgi?id=676
+\item https://bugs.libre-soc.org/show\_bug.cgi?id=1244
 \item https://libre-soc.org/openpower/sv/cookbook/fortran\_maxloc
     \item https://libre-soc.org/nlnet/\#faq
   \end{itemize}