X-Git-Url: https://scm.cri.ensmp.fr/git/pipstransfo.git/blobdiff_plain/46d0a69d42a94820cc336738ad91ec092cc77fcb..3133de1c1fead03bcef7d9c075bbd862afc948ff:/pipstransfo.tex

diff --git a/pipstransfo.tex b/pipstransfo.tex
index e69de29..fffba4d 100644
--- a/pipstransfo.tex
+++ b/pipstransfo.tex
@@ -0,0 +1,214 @@
+\documentclass[pdftex, a4paper, 11pt]{report}
+
+\usepackage[utf8]{inputenc}
+\usepackage[T1]{fontenc}
+\usepackage[english]{babel}
+\usepackage{lmodern}
+
+\usepackage{listings}
+\usepackage{hyperref}
+\usepackage{xspace}
+
+\newcommand\PIPS{PIPS\xspace}
+
+\title{\PIPS~--- List of code transformations}
+
+\begin{document}
+
+\chapter{Summary}
+
+\section{SGuelton}
+
+\begin{itemize}
+
+% memory allocation alteration
+\item scalar renaming
+% loop transformations
+\item loop unrolling
+\item loop fusion
+\item loop tiling
+\item loop rerolling
+\item loop interchange
+\item loop normalization
+% inter procedural transformations
+\item inlining
+% basic bloc transformations
+\item forward substitution
+% dead code removal
+\item constant propagation
+\item dead code elimination
+
+% ??
+\item array linearization
+\item common subexpression elimination
+\item directive generation
+\item flatten code
+\item goto elimination
+\item instruction selection
+\item invariant code motion
+\item iteration clamping
+\item loop unswitching
+\item memory footprint reduction
+\item n adress code generation
+\item outlining
+\item parallelism detection
+\item parallelism extraction
+\item privatization
+\item reduction detection
+\item redundant load-store elimination
+\item split update operator
+\item statement isolation
+\item strengh reduction
+
+\end{itemize}
+
+\section{Teraops}
+
+\begin{itemize}
+
+% memory allocation alteration
+\item scalar renaming
+\item scalar/array expansion
+\item scalar/array privatization
+\item scalarization % according to .pdf, not supported by Pips
+\item variable copying % not supported by Pips
+% loop transformations
+\item index set splitting % not supported by Pips
+\item loop peeling % not supported by Pips
+\item loop unrolling
+\item loop rerolling % not supported by Pips
+\item full loop unrolling
+\item idiom recognition
+\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 reversal % not supported by Pips
+\item loop skewing
+\item non-unimodular loop transformation
+\item strip-mining (loop sectionning)
+\item loop coalescing/loop collapsing % not supported by Pips
+\item loop tiling
+\item loop parallelization
+\item loop vectorization % not supported by Pips
+\item loop invariant code motion
+\item software pipelining % not supported by Pips
+\item locality increazing
+% 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 induction variable substitution % not supported by Pips
+\item if-conversion
+\item statement reordering % not supported by Pips
+\item expression optimization
+\item partial redundancy elimination
+% dead code removal
+\item unreachable code
+\item semantically uneachable code
+\item if and loop elimination
+\item use-def elimination
+\item constant propagation
+
+\end{itemize}
+
+\chapter{List of \PIPS transformations}
+
+\section{Memory allocation alteration}
+
+\begin{description}
+
+\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.}
+
+\end{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 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 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 normalization]{is a loop transformation that changes the loop initial increment value or the loop range to enforce certain values, generally~1.}
+
+\end{description}
+
+\section{Interprocedural transformations}
+
+\section{Base blocs transformations}
+
+\section{Dead code removal}
+
+\begin{description}
+
+\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[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.}
+
+\item[directive generation]{is a common name for code transformations that annotate the code with directives.}
+
+\item[constant propagation]{is a pass that replaces a variable by its value when this value is known at compile time.}
+
+\item[instruction selection]{is the process of mapping parts of the IR to machine instructions.}
+
+\item[goto elimination]{is the process of replacing \texttt{goto} instructions by a hierarchical control flow graph.}
+
+\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[common subexpression elimination]{is the process of replacing similar expressions by a variable that holds the result of their evaluation.}
+
+\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[dead code elimination]{is the process of pruning from a function all the statements whose results are never used.}
+
+\item[array linearization]{is the process of converting multidimensional array into unidimensional arrays, possibly with a conversion from array to pointer.}
+
+\item[iteration clamping]{is a loop transformation that extends the loop range but guards the loop body with the former range.}
+
+\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[strength reduction]{is the process of replacing an operation by an operation of lower cost.}
+
+\item[split update operator]{is the process of replacing an update operator by its expanded form.}
+
+\item[n address code generation]{is the process of splitting complex expression in simpler ones that take at most \(n\) operands.}
+
+\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[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.}
+
+\end{description}
+
+\nocite{*}
+\bibliographystyle{alpha}
+\bibliography{\jobname}
+
+\end{document}