diff options
Diffstat (limited to 'manual')
-rw-r--r-- | manual/APPNOTE_012_Verilog_to_BTOR.tex | 4 | ||||
-rw-r--r-- | manual/CHAPTER_Optimize.tex | 16 | ||||
-rw-r--r-- | manual/CHAPTER_Overview.tex | 2 | ||||
-rw-r--r-- | manual/PRESENTATION_ExSyn.tex | 6 |
4 files changed, 14 insertions, 14 deletions
diff --git a/manual/APPNOTE_012_Verilog_to_BTOR.tex b/manual/APPNOTE_012_Verilog_to_BTOR.tex index 245a6b0b8..1bc277876 100644 --- a/manual/APPNOTE_012_Verilog_to_BTOR.tex +++ b/manual/APPNOTE_012_Verilog_to_BTOR.tex @@ -208,7 +208,7 @@ read_verilog -sv $1; hierarchy -top $3; hierarchy -libdir $DIR; hierarchy -check; proc; opt; -opt_const -mux_undef; opt; +opt_expr -mux_undef; opt; rename -hide;;; splice; opt; memory_dff -wr_only; memory_collect;; @@ -263,7 +263,7 @@ read_verilog -sv $1; hierarchy -top $3; hierarchy -libdir $DIR; hierarchy -check; proc; opt; -opt_const -mux_undef; opt; +opt_expr -mux_undef; opt; rename -hide;;; splice; opt; memory;; diff --git a/manual/CHAPTER_Optimize.tex b/manual/CHAPTER_Optimize.tex index d09b3c478..07f5a26e6 100644 --- a/manual/CHAPTER_Optimize.tex +++ b/manual/CHAPTER_Optimize.tex @@ -15,7 +15,7 @@ passes that each perform a simple optimization: \begin{itemize} \item Once at the beginning of {\tt opt}: \begin{itemize} -\item {\tt opt\_const} +\item {\tt opt\_expr} \item {\tt opt\_share -nomux} \end{itemize} \item Repeat until result is stable: @@ -25,13 +25,13 @@ passes that each perform a simple optimization: \item {\tt opt\_share} \item {\tt opt\_rmdff} \item {\tt opt\_clean} -\item {\tt opt\_const} +\item {\tt opt\_expr} \end{itemize} \end{itemize} The following section describes each of the {\tt opt\_*} passes. -\subsection{The opt\_const pass} +\subsection{The opt\_expr pass} This pass performs const folding on the internal combinational cell types described in Chap.~\ref{chapter:celllib}. This means a cell with all constant @@ -57,11 +57,11 @@ this pass can also optimize cells with some constant inputs. $a$ & 1 & $a$ \\ 1 & $b$ & $b$ \\ \end{tabular} - \caption{Const folding rules for {\tt\$\_AND\_} cells as used in {\tt opt\_const}.} - \label{tab:opt_const_and} + \caption{Const folding rules for {\tt\$\_AND\_} cells as used in {\tt opt\_expr}.} + \label{tab:opt_expr_and} \end{table} -Table~\ref{tab:opt_const_and} shows the replacement rules used for optimizing +Table~\ref{tab:opt_expr_and} shows the replacement rules used for optimizing an {\tt\$\_AND\_} gate. The first three rules implement the obvious const folding rules. Note that `any' might include dynamic values calculated by other parts of the circuit. The following three lines propagate undef (X) states. @@ -76,10 +76,10 @@ an undef value or a 1 and therefore the output can be set to undef. The last two lines simply replace an {\tt\$\_AND\_} gate with one constant-1 input with a buffer. -Besides this basic const folding the {\tt opt\_const} pass can replace 1-bit wide +Besides this basic const folding the {\tt opt\_expr} pass can replace 1-bit wide {\tt \$eq} and {\tt \$ne} cells with buffers or not-gates if one input is constant. -The {\tt opt\_const} pass is very conservative regarding optimizing {\tt \$mux} cells, +The {\tt opt\_expr} pass is very conservative regarding optimizing {\tt \$mux} cells, as these cells are often used to model decision-trees and breaking these trees can interfere with other optimizations. diff --git a/manual/CHAPTER_Overview.tex b/manual/CHAPTER_Overview.tex index 032c0f8c3..4ce314825 100644 --- a/manual/CHAPTER_Overview.tex +++ b/manual/CHAPTER_Overview.tex @@ -488,7 +488,7 @@ select.cc}, {\tt show.cc}, \dots) and a couple of other small utility libraries. \item {\tt passes/} \\ This directory contains a subdirectory for each pass or group of passes. For example as of this writing the directory {\tt passes/opt/} contains the code for seven -passes: {\tt opt}, {\tt opt\_const}, {\tt opt\_muxtree}, {\tt opt\_reduce}, +passes: {\tt opt}, {\tt opt\_expr}, {\tt opt\_muxtree}, {\tt opt\_reduce}, {\tt opt\_rmdff}, {\tt opt\_rmunused} and {\tt opt\_share}. \item {\tt techlibs/} \\ diff --git a/manual/PRESENTATION_ExSyn.tex b/manual/PRESENTATION_ExSyn.tex index 1b56374d6..b57063c9c 100644 --- a/manual/PRESENTATION_ExSyn.tex +++ b/manual/PRESENTATION_ExSyn.tex @@ -144,7 +144,7 @@ The {\tt opt} command implements a series of simple optimizations. It also is a macro command that calls other commands: \begin{lstlisting}[xleftmargin=0.5cm, basicstyle=\ttfamily\fontsize{8pt}{10pt}\selectfont, language=ys] -opt_const # const folding +opt_expr # const folding and simple expression rewriting opt_share -nomux # merging identical cells do @@ -153,7 +153,7 @@ do opt_share # merging identical cells opt_rmdff # remove/simplify registers with constant inputs opt_clean # remove unused objects (cells, wires) from design - opt_const # const folding + opt_expr # const folding and simple expression rewriting while [changed design] \end{lstlisting} @@ -161,7 +161,7 @@ The command {\tt clean} can be used as alias for {\tt opt\_clean}. And {\tt ;;} can be used as shortcut for {\tt clean}. For example: \begin{lstlisting}[xleftmargin=0.5cm, basicstyle=\ttfamily\fontsize{8pt}{10pt}\selectfont, language=ys] -proc; opt; memory; opt_const;; fsm;; +proc; opt; memory; opt_expr;; fsm;; \end{lstlisting} \end{frame} |