clarify

[libreriscv.git] / simple_v_extension / simple_v_chennai_2018.tex

diff --git a/simple_v_extension/simple_v_chennai_2018.tex b/simple_v_extension/simple_v_chennai_2018.tex
index b72a5f61b996ea2c164f10019a76edc707a0d29f..1b99f95cdcc3d9a907a2636625eb50f20ffe06a4 100644 (file)
--- a/simple_v_extension/simple_v_chennai_2018.tex
+++ b/simple_v_extension/simple_v_chennai_2018.tex
@@ -60,7 +60,7 @@
  \begin{itemize}
    \item Extremely powerful (extensible to 256 registers)\vspace{10pt}
    \item Supports polymorphism, several datatypes (inc. FP16)\vspace{10pt}
-   \item Requires a separate Register File (16 w/ext to 256)\vspace{10pt}
+   \item Requires a separate Register File (32 w/ext to 256)\vspace{10pt}
    \item Implemented as a separate pipeline (no impact on scalar)\vspace{10pt}
   \end{itemize}
   However...\vspace{10pt}
@@ -145,7 +145,7 @@
   Note: EVERYTHING is parallelised:
    \begin{itemize}
    \item All LOAD/STORE (inc. Compressed, Int/FP versions)
-   \item All ALU ops (soft / hybrid / full HW, on per-op basis)
+   \item All ALU ops (Int, FP, SIMD, DSP, everything)
    \item All branches become predication targets (C.FNE added?)
    \item C.MV of particular interest (s/v, v/v, v/s)
    \item FCVT, FMV, FSGNJ etc. very similar to C.MV
@@ -297,6 +297,7 @@ for (int i = 0; i < VL; ++i)
    \item If s1 and s2 both scalars, Standard branch occurs
    \item Predication stored in integer regfile as a bitfield
    \item Scalar-vector and vector-vector supported
+   \item Overload Branch immediate to be predication target rs3
   \end{itemize}
 \end{frame}
 
@@ -512,7 +513,7 @@ function op\_add(rd, rs1, rs2) # add not VADD!
   \vspace{4pt}
   Notes:
    \begin{itemize}
-   \item Surprisingly powerful!
+   \item Surprisingly powerful! Zero-predication even more so
    \item Same arrangement for FVCT, FMV, FSGNJ etc.
   \end{itemize}
 }
@@ -680,7 +681,7 @@ loop:
             (scalar ops are just vectors of length 1)\vspace{4pt}
    \item Tightly coupled with the core (instruction issue)\\
          could be disabled through MISA switch\vspace{4pt}
-   \item An extra pipeline phase is pretty much essential\\
+   \item An extra pipeline phase almost certainly essential\\
          for fast low-latency implementations\vspace{4pt}
    \item With zeroing off, skipping non-predicated elements is hard:\\
          it is however an optimisation (and could be skipped).\vspace{4pt}