classe some dead code elim

[pipstransfo.git] / pipstransfo.tex

diff --git a/pipstransfo.tex b/pipstransfo.tex
index 9253d86..6a6e6d0 100644 (file)
--- a/pipstransfo.tex
+++ b/pipstransfo.tex
@@ -11,19 +11,16 @@
 
 \newcommand\PIPS{PIPS\xspace}
 
 
 \newcommand\PIPS{PIPS\xspace}
 

-

 \title{\PIPS~--- List of code transformations}
 
 \title{\PIPS~--- List of code transformations}
 

-
-

 \begin{document}
 
 \begin{document}
 

-

 \chapter{Summary}
 
 \section{SGuelton}
 
 \begin{itemize}
 \chapter{Summary}
 
 \section{SGuelton}
 
 \begin{itemize}

+

 % memory allocation alteration
 \item scalar renaming
 % loop transformations
 % memory allocation alteration
 \item scalar renaming
 % loop transformations


@@ -62,52 +59,53 @@
 \item split update operator
 \item statement isolation
 \item strengh reduction
 \item split update operator
 \item statement isolation
 \item strengh reduction

-\end{itemize}

 
 

+\end{itemize}

 
 \section{Teraops}
 
 \begin{itemize}
 
 \section{Teraops}
 
 \begin{itemize}

+

 % memory allocation alteration
 \item scalar renaming
 \item scalar/array expansion
 \item scalar/array privatization
 % memory allocation alteration
 \item scalar renaming
 \item scalar/array expansion
 \item scalar/array privatization

-\item scalarization
-\item variable copying
+\item scalarization % according to .pdf, not supported by Pips
+\item variable copying % not supported by Pips

 % loop transformations
 % loop transformations

-\item index set splitting
-\item loop peeling
+\item index set splitting % not supported by Pips
+\item loop peeling % not supported by Pips

 \item loop unrolling
 \item loop unrolling

-\item loop rerolling
+\item loop rerolling % not supported by Pips

 \item full loop unrolling
 \item idiom recognition
 \item full loop unrolling
 \item idiom recognition

-\item unswitching
-\item loop fusion
+\item unswitching % not supported by Pips
+\item loop fusion % not supported by Pips

 \item loop fission/loop distribution
 \item loop normalization
 \item unimodular loop transformation/hyperplane method
 \item loop interchange
 \item loop fission/loop distribution
 \item loop normalization
 \item unimodular loop transformation/hyperplane method
 \item loop interchange

-\item loop reversal
+\item loop reversal % not supported by Pips

 \item loop skewing
 \item non-unimodular loop transformation
 \item strip-mining (loop sectionning)
 \item loop skewing
 \item non-unimodular loop transformation
 \item strip-mining (loop sectionning)

-\item loop coalescing/loop collapsing
+\item loop coalescing/loop collapsing % not supported by Pips

 \item loop tiling
 \item loop parallelization
 \item loop tiling
 \item loop parallelization

-\item loop vectorization
+\item loop vectorization % not supported by Pips

 \item loop invariant code motion
 \item loop invariant code motion

-\item software pipelining
+\item software pipelining % not supported by Pips

 \item locality increazing
 \item locality increazing

-% inter procedural transformations
-\item loop embedding/loop jamming
-\item procedure inlining
+% interprocedural transformations
+\item loop embedding/loop jamming % not supported by Pips
+\item procedure inlining % not supported by Pips

 \item procedure cloning
 % basic bloc transformations
 \item node splitting
 \item forward expression substitution
 \item procedure cloning
 % basic bloc transformations
 \item node splitting
 \item forward expression substitution

-\item induction variable substitution
+\item induction variable substitution % not supported by Pips

 \item if-conversion
 \item if-conversion

-\item statement reordering
+\item statement reordering % not supported by Pips

 \item expression optimization
 \item partial redundancy elimination
 % dead code removal
 \item expression optimization
 \item partial redundancy elimination
 % dead code removal


@@ -116,6 +114,7 @@
 \item if and loop elimination
 \item use-def elimination
 \item constant propagation
 \item if and loop elimination
 \item use-def elimination
 \item constant propagation

+

 \end{itemize}
 
 \chapter{List of \PIPS transformations}
 \end{itemize}
 
 \chapter{List of \PIPS transformations}


@@ -124,162 +123,98 @@
 
 \begin{description}
 
 
 \begin{description}
 

-\item[scalar renaming]{is the process of renaming scalar variables to
-    suppress false data dependencies.}
+\item[scalar renaming]{is the process of renaming scalar variables to suppress false data dependencies.}

 
 

-\item[privatization]{is the process of detecting variables that are
-    private to a loop body, i.e.\ written first, then read.}
+\item[privatization]{is the process of detecting variables that are private to a loop body, i.e.\ written first, then read.}

 
 \end{description}
 
 
 \end{description}
 

-

 \section{Loop transformations}
 
 \begin{description}
 
 \section{Loop transformations}
 
 \begin{description}
 

-\item[loop unrolling]{
-  is a loop transformation.
-  Unrolling a loop by a factor of \(n\) consists in the substitution of a loop
-  body by itself, replicated \(n\) times. A prelude and/or postlude are
-  added to preserve the number of iteration.}
+\item[loop unrolling]{is a loop transformation.
+Unrolling a loop by a factor of \(n\) consists in the substitution of a loop body by itself, replicated \(n\) times.
+A prelude and/or postlude are added to preserve the number of iteration.}

 
 

-\item[loop fusion]{
-  is a loop transformation that replaces two loops by a single loops whose
-  body is the concatenation of the bodies of the two initial loops.}
+\item[loop fusion]{is a loop transformation that replaces two loops by a single loops whose body is the concatenation of the bodies of the two initial loops.}

 
 

-\item[loop tiling]{
-  is a loop nest transformation that changes the loop execution order
-  through a partitions of the iteration space into
-  chunks, so that the iteration is performed over each chunk and in the
-  chunks.}
+\item[loop tiling]{is a loop nest transformation that changes the loop execution order through a partitions of the iteration space into chunks, so that the iteration is performed over each chunk and in the chunks.}

 
 

-\item[loop interchange]{is a loop transformation that permutes two
-  loops from a loop nest.}
+\item[loop interchange]{is a loop transformation that permutes two loops from a loop nest.}

 
 

-\item[loop unswitching]{is a loop transformation that replaces a
-  loop containing a test independent from the loop execution by a test
-  containing the loop without the test in both true and false branch.}
+\item[loop unswitching]{is a loop transformation that replaces a loop containing a test independent from the loop execution by a test containing the loop without the test in both true and false branch.}

 
 

-\item[loop normalization]{is a loop transformation that changes
-  the loop initial increment value or the loop range to enforce certain values,
-  generally~1.}
+\item[loop normalization]{is a loop transformation that changes the loop initial increment value or the loop range to enforce certain values, generally~1.}

 
 \end{description}
 
 
 \end{description}
 

-\section{Inter-procedural transformations}
+\section{Interprocedural transformations}

 
 \section{Base blocs transformations}
 
 \section{Dead code removal}
 
 
 \section{Base blocs transformations}
 
 \section{Dead code removal}
 

-
-
-

 \begin{description}
 
 \begin{description}
 

+\item[dead code elimination]{is the process of pruning from a function all the statements whose results are never used.}

 
 

-\item[inlining]{
-  is a function transformation. Inlining a function
-  \texttt{foo} in its caller \texttt{bar} consists in the substitution
-  of the calls to \texttt{foo} in \texttt{bar} by the function body
-  after replacement of the formal parameters by their effective
-  parameters.
-}
-
-\item[forward substitution]{
-  is the process of replacing a reference read in an
-  expression by the latest expression affected to it.}
-
-
-
+\item[common subexpression elimination]{is the process of replacing similar expressions by a variable that holds the result of their evaluation.}

 
 

+\item[goto elimination]{is the process of replacing \texttt{goto} instructions by a hierarchical control flow graph.}

 
 

-\item[reduction detection]{
-  is an analysis that identifies statements that perform a reduction over a
-  variable.}
-
-\item[parallelism detection]{
-  is a common name for analysis that detect if a loop can be run in parallel.}
-
-\item[parallelism extraction]{
-  is a common name for code transformations that modifies loop nest to make it legal to
-  run them in parallel.}
+\end{description}

 
 

-\item[directive generation]{
-  is a common name for code transformations that annotate the code with directives.}
+\section{Other (non classes)}

 
 

-\item[constant propagation]{
-  is a pass that replaces a variable by its value when this value is
-  known at compile time.}
+\begin{description}

 
 

-\item[instruction selection]{
-  is the process of mapping parts of the IR to machine instructions.}
+\item[inlining]{is a function transformation.
+Inlining a function \texttt{foo} in its caller \texttt{bar} consists in the substitution of the calls to \texttt{foo} in \texttt{bar} by the function body after replacement of the formal parameters by their effective parameters.}

 
 

-\item[goto elimination]{
-  is the process of replacing \texttt{goto} instructions by a hierarchical control flow
-  graph.}
+\item[forward substitution]{is the process of replacing a reference read in an expression by the latest expression affected to it.}

 
 

-\item[outlining]{
-  is the process of extracting part of a function body into a new function
-  and replacing it in the initial function by a function call.}
+\item[reduction detection]{is an analysis that identifies statements that perform a reduction over a variable.}

 
 

-\item[common subexpression elimination]{
-  is the process of replacing similar expressions by a variable that holds
-  the result of their evaluation.}
+\item[parallelism detection]{is a common name for analysis that detect if a loop can be run in parallel.}

 
 

+\item[parallelism extraction]{is a common name for code transformations that modifies loop nest to make it legal to run them in parallel.}

 
 

+\item[directive generation]{is a common name for code transformations that annotate the code with directives.}

 
 

-\item[statement isolation]{is the process of replacing all
-  variables referenced in a statement by newly declared variables. A
-  prologue
-  and an epilogue are added to copy old variable values to new variable, back
-  and forth.}
+\item[constant propagation]{is a pass that replaces a variable by its value when this value is known at compile time.}

 
 

-\item[dead code elimination]{is the process of pruning from a
-  function all the statements whose results are
-  never used.}
+\item[instruction selection]{is the process of mapping parts of the IR to machine instructions.}

 
 

-\item[array linearization]{is the process of converting
-  multidimensional array into unidimensional arrays, possibly with a
-  conversion from array to pointer.}
+\item[outlining]{is the process of extracting part of a function body into a new function and replacing it in the initial function by a function call.}

 
 

+\item[statement isolation]{is the process of replacing all variables referenced in a statement by newly declared variables.
+A prologue and an epilogue are added to copy old variable values to new variable, back and forth.}

 
 

-\item[iteration clamping]{is a loop transformation that extends
-  the loop range but guards the loop body with the former range.}
+\item[array linearization]{is the process of converting multidimensional array into unidimensional arrays, possibly with a conversion from array to pointer.}

 
 

-\item[flatten code]{is the process of pruning a function body from
-  declaration blocks so that all declarations are made at the top level.}
+\item[iteration clamping]{is a loop transformation that extends the loop range but guards the loop body with the former range.}

 
 

-\item[strength reduction]{is the process of replacing an operation
-  by an operation of lower cost.}
+\item[flatten code]{is the process of pruning a function body from declaration blocks so that all declarations are made at the top level.}

 
 

-\item[split update operator]{is the process of replacing an update
-  operator by its expanded form.}
+\item[strength reduction]{is the process of replacing an operation by an operation of lower cost.}

 
 

-\item[n address code generation]{is the process of splitting
-  complex expression in simpler ones that take at most \(n\) operands.}
+\item[split update operator]{is the process of replacing an update operator by its expanded form.}

 
 

-\item[memory footprint reduction]{is the process of tiling a loop
-  to make sure the iteration over the tile has a memory footprint bounded by
-  a given value.}
+\item[n address code generation]{is the process of splitting complex expression in simpler ones that take at most \(n\) operands.}

 
 

-\item[redundant load-store elimination]{is an inter procedural transformation
-  that optimizes data transfers by delaying and merging them.}
+\item[memory footprint reduction]{is the process of tiling a loop to make sure the iteration over the tile has a memory footprint bounded by a given value.}

 
 

-\item[invariant code motion]{is a loop transformation that moves outside
-  of the loop
-  the code from its body that is independent from the iteration.}
+\item[redundant load-store elimination]{is an inter procedural transformation that optimizes data transfers by delaying and merging them.}

 
 

+\item[invariant code motion]{is a loop transformation that moves outside of the loop the code from its body that is independent from the iteration.}

 
 

+\item[loop rerolling]{finds manually unrolled loop and replace them by their non-unrolled version.}

 
 

-\item[loop rerolling]{finds manually unrolled loop and replace
-  them by their non-unrolled version.}

 \end{description}
 
 \end{description}
 

-

 \nocite{*}
 \bibliographystyle{alpha}
 \nocite{*}
 \bibliographystyle{alpha}

-\bibliography{refs}
-
+\bibliography{\jobname}

 
 \end{document}
 
 \end{document}