[pypy-commit] extradoc extradoc: vaguely start with a possible VMIL paper about guards
cfbolz
noreply at buildbot.pypy.org
Mon Jul 2 16:46:55 CEST 2012
Author: Carl Friedrich Bolz <cfbolz at gmx.de>
Branch: extradoc
Changeset: r4258:4f1ed76ab194
Date: 2012-07-02 16:46 +0200
http://bitbucket.org/pypy/extradoc/changeset/4f1ed76ab194/
Log: vaguely start with a possible VMIL paper about guards
diff --git a/talk/vmil2012/Makefile b/talk/vmil2012/Makefile
new file mode 100644
--- /dev/null
+++ b/talk/vmil2012/Makefile
@@ -0,0 +1,13 @@
+
+jit-guards.pdf: paper.tex paper.bib
+ pdflatex paper
+ bibtex paper
+ pdflatex paper
+ pdflatex paper
+ mv paper.pdf jit-guards.pdf
+
+view: jit-guards.pdf
+ evince jit-guards.pdf &
+
+%.tex: %.py
+ pygmentize -l python -o $@ $<
diff --git a/talk/vmil2012/paper.bib b/talk/vmil2012/paper.bib
new file mode 100644
diff --git a/talk/vmil2012/paper.tex b/talk/vmil2012/paper.tex
new file mode 100644
--- /dev/null
+++ b/talk/vmil2012/paper.tex
@@ -0,0 +1,181 @@
+\documentclass{sigplanconf}
+
+\usepackage{ifthen}
+\usepackage{fancyvrb}
+\usepackage{color}
+\usepackage{wrapfig}
+\usepackage{ulem}
+\usepackage{xspace}
+\usepackage{relsize}
+\usepackage{epsfig}
+\usepackage{amssymb}
+\usepackage{amsmath}
+\usepackage{amsfonts}
+\usepackage[utf8]{inputenc}
+\usepackage{setspace}
+
+\usepackage{listings}
+
+\usepackage[T1]{fontenc}
+\usepackage[scaled=0.81]{beramono}
+
+
+\definecolor{commentgray}{rgb}{0.3,0.3,0.3}
+
+\lstset{
+ basicstyle=\ttfamily\footnotesize,
+ language=Python,
+ keywordstyle=\bfseries,
+ stringstyle=\color{blue},
+ commentstyle=\color{commentgray}\textit,
+ fancyvrb=true,
+ showstringspaces=false,
+ %keywords={def,while,if,elif,return,class,get,set,new,guard_class}
+ numberstyle = \tiny,
+ numbersep = -20pt,
+}
+
+\newboolean{showcomments}
+\setboolean{showcomments}{false}
+\ifthenelse{\boolean{showcomments}}
+ {\newcommand{\nb}[2]{
+ \fbox{\bfseries\sffamily\scriptsize#1}
+ {\sf\small$\blacktriangleright$\textit{#2}$\blacktriangleleft$}
+ }
+ \newcommand{\version}{\emph{\scriptsize$-$Id: main.tex 19055 2008-06-05 11:20:31Z cfbolz $-$}}
+ }
+ {\newcommand{\nb}[2]{}
+ \newcommand{\version}{}
+ }
+
+\newcommand\cfbolz[1]{\nb{CFB}{#1}}
+\newcommand\toon[1]{\nb{TOON}{#1}}
+\newcommand\anto[1]{\nb{ANTO}{#1}}
+\newcommand\arigo[1]{\nb{AR}{#1}}
+\newcommand\fijal[1]{\nb{FIJAL}{#1}}
+\newcommand\pedronis[1]{\nb{PEDRONIS}{#1}}
+\newcommand{\commentout}[1]{}
+
+\newcommand{\noop}{}
+
+
+\newcommand\ie{i.e.,\xspace}
+\newcommand\eg{e.g.,\xspace}
+
+\normalem
+
+\let\oldcite=\cite
+
+\renewcommand\cite[1]{\ifthenelse{\equal{#1}{XXX}}{[citation~needed]}{\oldcite{#1}}}
+
+\definecolor{gray}{rgb}{0.5,0.5,0.5}
+
+\begin{document}
+
+\title{Efficiently Handling Guards in the low level design of RPython's tracing JIT}
+
+\authorinfo{Carl Friedrich Bolz$^a$ \and David Schneider$^{a}$}
+ {$^a$Heinrich-Heine-Universität Düsseldorf, STUPS Group, Germany
+ }
+ {XXX emails}
+
+\conferenceinfo{VMIL'11}{}
+\CopyrightYear{2012}
+\crdata{}
+
+\maketitle
+
+\category{D.3.4}{Programming Languages}{Processors}[code generation,
+incremental compilers, interpreters, run-time environments]
+
+\terms
+Languages, Performance, Experimentation
+
+\keywords{XXX}
+
+\begin{abstract}
+
+\end{abstract}
+
+
+%___________________________________________________________________________
+\section{Introduction}
+
+
+The contributions of this paper are:
+\begin{itemize}
+ \item
+\end{itemize}
+
+The paper is structured as follows:
+
+\section{Background}
+\label{sec:Background}
+
+\subsection{RPython and the PyPy Project}
+\label{sub:pypy}
+
+
+\subsection{PyPy's Meta-Tracing JIT Compilers}
+\label{sub:tracing}
+
+ * Tracing JITs
+ * JIT Compiler
+ * describe the tracing jit stuff in pypy
+ * reference tracing the meta level paper for a high level description of what the JIT does
+ * JIT Architecture
+ * Explain the aspects of tracing and optimization
+
+%___________________________________________________________________________
+
+
+\section{Resume Data}
+\label{sec:Resume Data}
+
+* High level handling of resumedata
+ * trade-off fast tracing v/s memory usage
+ * creation in the frontendÂ
+ * optimization
+ * compression
+ * interaction with optimization
+ * tracing and attaching bridges and throwing away resume data
+ * compiling bridges
+
+% section Resume Data (end)
+
+\section{Guards in the Backend}
+\label{sec:Guards in the Backend}
+
+* Low level handling of guards
+ * Fast guard checks v/s memory usage
+ * memory efficient encoding of low level resume data
+ * fast checks for guard conditions
+ * slow bail out
+
+% section Guards in the Backend (end)
+
+%___________________________________________________________________________
+
+
+\section{Evaluation}
+\label{sec:evaluation}
+
+* Evaluation
+ * Measure guard memory consumption and machine code size
+ * Extrapolate memory consumption for guard other guard encodings
+ * compare to naive variant
+ * Measure how many guards survive optimization
+ * Measure the of guards and how many of these ever fail
+
+\section{Related Work}
+
+
+\section{Conclusion}
+
+
+\section*{Acknowledgements}
+
+\bibliographystyle{abbrv}
+\bibliography{paper}
+
+\end{document}
diff --git a/talk/vmil2012/sigplanconf.cls b/talk/vmil2012/sigplanconf.cls
new file mode 100644
--- /dev/null
+++ b/talk/vmil2012/sigplanconf.cls
@@ -0,0 +1,1250 @@
+%-----------------------------------------------------------------------------
+%
+% LaTeX Class/Style File
+%
+% Name: sigplanconf.cls
+% Purpose: A LaTeX 2e class file for SIGPLAN conference proceedings.
+% This class file supercedes acm_proc_article-sp,
+% sig-alternate, and sigplan-proc.
+%
+% Author: Paul C. Anagnostopoulos
+% Windfall Software
+% 978 371-2316
+% paul at windfall.com
+%
+% Created: 12 September 2004
+%
+% Revisions: See end of file.
+%
+%-----------------------------------------------------------------------------
+
+
+\NeedsTeXFormat{LaTeX2e}[1995/12/01]
+\ProvidesClass{sigplanconf}[2009/09/30 v2.3 ACM SIGPLAN Proceedings]
+
+% The following few pages contain LaTeX programming extensions adapted
+% from the ZzTeX macro package.
+
+% Token Hackery
+% ----- -------
+
+
+\def \@expandaftertwice {\expandafter\expandafter\expandafter}
+\def \@expandafterthrice {\expandafter\expandafter\expandafter\expandafter
+ \expandafter\expandafter\expandafter}
+
+% This macro discards the next token.
+
+\def \@discardtok #1{}% token
+
+% This macro removes the `pt' following a dimension.
+
+{\catcode `\p = 12 \catcode `\t = 12
+
+\gdef \@remover #1pt{#1}
+
+} % \catcode
+
+% This macro extracts the contents of a macro and returns it as plain text.
+% Usage: \expandafter\@defof \meaning\macro\@mark
+
+\def \@defof #1:->#2\@mark{#2}
+
+% Control Sequence Names
+% ------- -------- -----
+
+
+\def \@name #1{% {\tokens}
+ \csname \expandafter\@discardtok \string#1\endcsname}
+
+\def \@withname #1#2{% {\command}{\tokens}
+ \expandafter#1\csname \expandafter\@discardtok \string#2\endcsname}
+
+% Flags (Booleans)
+% ----- ----------
+
+% The boolean literals \@true and \@false are appropriate for use with
+% the \if command, which tests the codes of the next two characters.
+
+\def \@true {TT}
+\def \@false {FL}
+
+\def \@setflag #1=#2{\edef #1{#2}}% \flag = boolean
+
+% IF and Predicates
+% -- --- ----------
+
+% A "predicate" is a macro that returns \@true or \@false as its value.
+% Such values are suitable for use with the \if conditional. For example:
+%
+% \if \@oddp{\x} <then-clause> \else <else-clause> \fi
+
+% A predicate can be used with \@setflag as follows:
+%
+% \@setflag \flag = {<predicate>}
+
+% Here are the predicates for TeX's repertoire of conditional
+% commands. These might be more appropriately interspersed with
+% other definitions in this module, but what the heck.
+% Some additional "obvious" predicates are defined.
+
+\def \@eqlp #1#2{\ifnum #1 = #2\@true \else \@false \fi}
+\def \@neqlp #1#2{\ifnum #1 = #2\@false \else \@true \fi}
+\def \@lssp #1#2{\ifnum #1 < #2\@true \else \@false \fi}
+\def \@gtrp #1#2{\ifnum #1 > #2\@true \else \@false \fi}
+\def \@zerop #1{\ifnum #1 = 0\@true \else \@false \fi}
+\def \@onep #1{\ifnum #1 = 1\@true \else \@false \fi}
+\def \@posp #1{\ifnum #1 > 0\@true \else \@false \fi}
+\def \@negp #1{\ifnum #1 < 0\@true \else \@false \fi}
+\def \@oddp #1{\ifodd #1\@true \else \@false \fi}
+\def \@evenp #1{\ifodd #1\@false \else \@true \fi}
+\def \@rangep #1#2#3{\if \@orp{\@lssp{#1}{#2}}{\@gtrp{#1}{#3}}\@false \else
+ \@true \fi}
+\def \@tensp #1{\@rangep{#1}{10}{19}}
+
+\def \@dimeqlp #1#2{\ifdim #1 = #2\@true \else \@false \fi}
+\def \@dimneqlp #1#2{\ifdim #1 = #2\@false \else \@true \fi}
+\def \@dimlssp #1#2{\ifdim #1 < #2\@true \else \@false \fi}
+\def \@dimgtrp #1#2{\ifdim #1 > #2\@true \else \@false \fi}
+\def \@dimzerop #1{\ifdim #1 = 0pt\@true \else \@false \fi}
+\def \@dimposp #1{\ifdim #1 > 0pt\@true \else \@false \fi}
+\def \@dimnegp #1{\ifdim #1 < 0pt\@true \else \@false \fi}
+
+\def \@vmodep {\ifvmode \@true \else \@false \fi}
+\def \@hmodep {\ifhmode \@true \else \@false \fi}
+\def \@mathmodep {\ifmmode \@true \else \@false \fi}
+\def \@textmodep {\ifmmode \@false \else \@true \fi}
+\def \@innermodep {\ifinner \@true \else \@false \fi}
+
+\long\def \@codeeqlp #1#2{\if #1#2\@true \else \@false \fi}
+
+\long\def \@cateqlp #1#2{\ifcat #1#2\@true \else \@false \fi}
+
+\long\def \@tokeqlp #1#2{\ifx #1#2\@true \else \@false \fi}
+\long\def \@xtokeqlp #1#2{\expandafter\ifx #1#2\@true \else \@false \fi}
+
+\long\def \@definedp #1{%
+ \expandafter\ifx \csname \expandafter\@discardtok \string#1\endcsname
+ \relax \@false \else \@true \fi}
+
+\long\def \@undefinedp #1{%
+ \expandafter\ifx \csname \expandafter\@discardtok \string#1\endcsname
+ \relax \@true \else \@false \fi}
+
+\def \@emptydefp #1{\ifx #1\@empty \@true \else \@false \fi}% {\name}
+
+\let \@emptylistp = \@emptydefp
+
+\long\def \@emptyargp #1{% {#n}
+ \@empargp #1\@empargq\@mark}
+\long\def \@empargp #1#2\@mark{%
+ \ifx #1\@empargq \@true \else \@false \fi}
+\def \@empargq {\@empargq}
+
+\def \@emptytoksp #1{% {\tokenreg}
+ \expandafter\@emptoksp \the#1\@mark}
+
+\long\def \@emptoksp #1\@mark{\@emptyargp{#1}}
+
+\def \@voidboxp #1{\ifvoid #1\@true \else \@false \fi}
+\def \@hboxp #1{\ifhbox #1\@true \else \@false \fi}
+\def \@vboxp #1{\ifvbox #1\@true \else \@false \fi}
+
+\def \@eofp #1{\ifeof #1\@true \else \@false \fi}
+
+
+% Flags can also be used as predicates, as in:
+%
+% \if \flaga <then-clause> \else <else-clause> \fi
+
+
+% Now here we have predicates for the common logical operators.
+
+\def \@notp #1{\if #1\@false \else \@true \fi}
+
+\def \@andp #1#2{\if #1%
+ \if #2\@true \else \@false \fi
+ \else
+ \@false
+ \fi}
+
+\def \@orp #1#2{\if #1%
+ \@true
+ \else
+ \if #2\@true \else \@false \fi
+ \fi}
+
+\def \@xorp #1#2{\if #1%
+ \if #2\@false \else \@true \fi
+ \else
+ \if #2\@true \else \@false \fi
+ \fi}
+
+% Arithmetic
+% ----------
+
+\def \@increment #1{\advance #1 by 1\relax}% {\count}
+
+\def \@decrement #1{\advance #1 by -1\relax}% {\count}
+
+% Options
+% -------
+
+
+\@setflag \@authoryear = \@false
+\@setflag \@blockstyle = \@false
+\@setflag \@copyrightwanted = \@true
+\@setflag \@explicitsize = \@false
+\@setflag \@mathtime = \@false
+\@setflag \@natbib = \@true
+\@setflag \@ninepoint = \@true
+\newcount{\@numheaddepth} \@numheaddepth = 3
+\@setflag \@onecolumn = \@false
+\@setflag \@preprint = \@false
+\@setflag \@reprint = \@false
+\@setflag \@tenpoint = \@false
+\@setflag \@times = \@false
+
+% Note that all the dangerous article class options are trapped.
+
+\DeclareOption{9pt}{\@setflag \@ninepoint = \@true
+ \@setflag \@explicitsize = \@true}
+
+\DeclareOption{10pt}{\PassOptionsToClass{10pt}{article}%
+ \@setflag \@ninepoint = \@false
+ \@setflag \@tenpoint = \@true
+ \@setflag \@explicitsize = \@true}
+
+\DeclareOption{11pt}{\PassOptionsToClass{11pt}{article}%
+ \@setflag \@ninepoint = \@false
+ \@setflag \@explicitsize = \@true}
+
+\DeclareOption{12pt}{\@unsupportedoption{12pt}}
+
+\DeclareOption{a4paper}{\@unsupportedoption{a4paper}}
+
+\DeclareOption{a5paper}{\@unsupportedoption{a5paper}}
+
+\DeclareOption{authoryear}{\@setflag \@authoryear = \@true}
+
+\DeclareOption{b5paper}{\@unsupportedoption{b5paper}}
+
+\DeclareOption{blockstyle}{\@setflag \@blockstyle = \@true}
+
+\DeclareOption{cm}{\@setflag \@times = \@false}
+
+\DeclareOption{computermodern}{\@setflag \@times = \@false}
+
+\DeclareOption{executivepaper}{\@unsupportedoption{executivepaper}}
+
+\DeclareOption{indentedstyle}{\@setflag \@blockstyle = \@false}
+
+\DeclareOption{landscape}{\@unsupportedoption{landscape}}
+
+\DeclareOption{legalpaper}{\@unsupportedoption{legalpaper}}
+
+\DeclareOption{letterpaper}{\@unsupportedoption{letterpaper}}
+
+\DeclareOption{mathtime}{\@setflag \@mathtime = \@true}
+
+\DeclareOption{natbib}{\@setflag \@natbib = \@true}
+
+\DeclareOption{nonatbib}{\@setflag \@natbib = \@false}
+
+\DeclareOption{nocopyrightspace}{\@setflag \@copyrightwanted = \@false}
+
+\DeclareOption{notitlepage}{\@unsupportedoption{notitlepage}}
+
+\DeclareOption{numberedpars}{\@numheaddepth = 4}
+
+\DeclareOption{numbers}{\@setflag \@authoryear = \@false}
+
+%%%\DeclareOption{onecolumn}{\@setflag \@onecolumn = \@true}
+
+\DeclareOption{preprint}{\@setflag \@preprint = \@true}
+
+\DeclareOption{reprint}{\@setflag \@reprint = \@true}
+
+\DeclareOption{times}{\@setflag \@times = \@true}
+
+\DeclareOption{titlepage}{\@unsupportedoption{titlepage}}
+
+\DeclareOption{twocolumn}{\@setflag \@onecolumn = \@false}
+
+\DeclareOption*{\PassOptionsToClass{\CurrentOption}{article}}
+
+\ExecuteOptions{9pt,indentedstyle,times}
+\@setflag \@explicitsize = \@false
+\ProcessOptions
+
+\if \@onecolumn
+ \if \@notp{\@explicitsize}%
+ \@setflag \@ninepoint = \@false
+ \PassOptionsToClass{11pt}{article}%
+ \fi
+ \PassOptionsToClass{twoside,onecolumn}{article}
+\else
+ \PassOptionsToClass{twoside,twocolumn}{article}
+\fi
+\LoadClass{article}
+
+\def \@unsupportedoption #1{%
+ \ClassError{proc}{The standard '#1' option is not supported.}}
+
+% This can be used with the 'reprint' option to get the final folios.
+
+\def \setpagenumber #1{%
+ \setcounter{page}{#1}}
+
+\AtEndDocument{\label{sigplanconf at finalpage}}
+
+% Utilities
+% ---------
+
+
+\newcommand{\setvspace}[2]{%
+ #1 = #2
+ \advance #1 by -1\parskip}
+
+% Document Parameters
+% -------- ----------
+
+
+% Page:
+
+\setlength{\hoffset}{-1in}
+\setlength{\voffset}{-1in}
+
+\setlength{\topmargin}{1in}
+\setlength{\headheight}{0pt}
+\setlength{\headsep}{0pt}
+
+\if \@onecolumn
+ \setlength{\evensidemargin}{.75in}
+ \setlength{\oddsidemargin}{.75in}
+\else
+ \setlength{\evensidemargin}{.75in}
+ \setlength{\oddsidemargin}{.75in}
+\fi
+
+% Text area:
+
+\newdimen{\standardtextwidth}
+\setlength{\standardtextwidth}{42pc}
+
+\if \@onecolumn
+ \setlength{\textwidth}{40.5pc}
+\else
+ \setlength{\textwidth}{\standardtextwidth}
+\fi
+
+\setlength{\topskip}{8pt}
+\setlength{\columnsep}{2pc}
+\setlength{\textheight}{54.5pc}
+
+% Running foot:
+
+\setlength{\footskip}{30pt}
+
+% Paragraphs:
+
+\if \@blockstyle
+ \setlength{\parskip}{5pt plus .1pt minus .5pt}
+ \setlength{\parindent}{0pt}
+\else
+ \setlength{\parskip}{0pt}
+ \setlength{\parindent}{12pt}
+\fi
+
+\setlength{\lineskip}{.5pt}
+\setlength{\lineskiplimit}{\lineskip}
+
+\frenchspacing
+\pretolerance = 400
+\tolerance = \pretolerance
+\setlength{\emergencystretch}{5pt}
+\clubpenalty = 10000
+\widowpenalty = 10000
+\setlength{\hfuzz}{.5pt}
+
+% Standard vertical spaces:
+
+\newskip{\standardvspace}
+\setvspace{\standardvspace}{5pt plus 1pt minus .5pt}
+
+% Margin paragraphs:
+
+\setlength{\marginparwidth}{36pt}
+\setlength{\marginparsep}{2pt}
+\setlength{\marginparpush}{8pt}
+
+
+\setlength{\skip\footins}{8pt plus 3pt minus 1pt}
+\setlength{\footnotesep}{9pt}
+
+\renewcommand{\footnoterule}{%
+ \hrule width .5\columnwidth height .33pt depth 0pt}
+
+\renewcommand{\@makefntext}[1]{%
+ \noindent \@makefnmark \hspace{1pt}#1}
+
+% Floats:
+
+\setcounter{topnumber}{4}
+\setcounter{bottomnumber}{1}
+\setcounter{totalnumber}{4}
+
+\renewcommand{\fps at figure}{tp}
+\renewcommand{\fps at table}{tp}
+\renewcommand{\topfraction}{0.90}
+\renewcommand{\bottomfraction}{0.30}
+\renewcommand{\textfraction}{0.10}
+\renewcommand{\floatpagefraction}{0.75}
+
+\setcounter{dbltopnumber}{4}
+
+\renewcommand{\dbltopfraction}{\topfraction}
+\renewcommand{\dblfloatpagefraction}{\floatpagefraction}
+
+\setlength{\floatsep}{18pt plus 4pt minus 2pt}
+\setlength{\textfloatsep}{18pt plus 4pt minus 3pt}
+\setlength{\intextsep}{10pt plus 4pt minus 3pt}
+
+\setlength{\dblfloatsep}{18pt plus 4pt minus 2pt}
+\setlength{\dbltextfloatsep}{20pt plus 4pt minus 3pt}
+
+% Miscellaneous:
+
+\errorcontextlines = 5
+
+% Fonts
+% -----
+
+
+\if \@times
+ \renewcommand{\rmdefault}{ptm}%
+ \if \@mathtime
+ \usepackage[mtbold,noTS1]{mathtime}%
+ \else
+%%% \usepackage{mathptm}%
+ \fi
+\else
+ \relax
+\fi
+
+\if \@ninepoint
+
+\renewcommand{\normalsize}{%
+ \@setfontsize{\normalsize}{9pt}{10pt}%
+ \setlength{\abovedisplayskip}{5pt plus 1pt minus .5pt}%
+ \setlength{\belowdisplayskip}{\abovedisplayskip}%
+ \setlength{\abovedisplayshortskip}{3pt plus 1pt minus 2pt}%
+ \setlength{\belowdisplayshortskip}{\abovedisplayshortskip}}
+
+\renewcommand{\tiny}{\@setfontsize{\tiny}{5pt}{6pt}}
+
+\renewcommand{\scriptsize}{\@setfontsize{\scriptsize}{7pt}{8pt}}
+
+\renewcommand{\small}{%
+ \@setfontsize{\small}{8pt}{9pt}%
+ \setlength{\abovedisplayskip}{4pt plus 1pt minus 1pt}%
+ \setlength{\belowdisplayskip}{\abovedisplayskip}%
+ \setlength{\abovedisplayshortskip}{2pt plus 1pt}%
+ \setlength{\belowdisplayshortskip}{\abovedisplayshortskip}}
+
+\renewcommand{\footnotesize}{%
+ \@setfontsize{\footnotesize}{8pt}{9pt}%
+ \setlength{\abovedisplayskip}{4pt plus 1pt minus .5pt}%
+ \setlength{\belowdisplayskip}{\abovedisplayskip}%
+ \setlength{\abovedisplayshortskip}{2pt plus 1pt}%
+ \setlength{\belowdisplayshortskip}{\abovedisplayshortskip}}
+
+\renewcommand{\large}{\@setfontsize{\large}{11pt}{13pt}}
+
+\renewcommand{\Large}{\@setfontsize{\Large}{14pt}{18pt}}
+
+\renewcommand{\LARGE}{\@setfontsize{\LARGE}{18pt}{20pt}}
+
+\renewcommand{\huge}{\@setfontsize{\huge}{20pt}{25pt}}
+
+\renewcommand{\Huge}{\@setfontsize{\Huge}{25pt}{30pt}}
+
+\else\if \@tenpoint
+
+\relax
+
+\else
+
+\relax
+
+\fi\fi
+
+% Abstract
+% --------
+
+
+\renewenvironment{abstract}{%
+ \section*{Abstract}%
+ \normalsize}{%
+ }
+
+% Bibliography
+% ------------
+
+
+\renewenvironment{thebibliography}[1]
+ {\section*{\refname
+ \@mkboth{\MakeUppercase\refname}{\MakeUppercase\refname}}%
+ \list{\@biblabel{\@arabic\c at enumiv}}%
+ {\settowidth\labelwidth{\@biblabel{#1}}%
+ \leftmargin\labelwidth
+ \advance\leftmargin\labelsep
+ \@openbib at code
+ \usecounter{enumiv}%
+ \let\p at enumiv\@empty
+ \renewcommand\theenumiv{\@arabic\c at enumiv}}%
+ \bibfont
+ \clubpenalty4000
+ \@clubpenalty \clubpenalty
+ \widowpenalty4000%
+ \sfcode`\.\@m}
+ {\def\@noitemerr
+ {\@latex at warning{Empty `thebibliography' environment}}%
+ \endlist}
+
+\if \@natbib
+
+\if \@authoryear
+ \typeout{Using natbib package with 'authoryear' citation style.}
+ \usepackage[authoryear,sort,square]{natbib}
+ \bibpunct{[}{]}{;}{a}{}{,} % Change citation separator to semicolon,
+ % eliminate comma between author and year.
+ \let \cite = \citep
+\else
+ \typeout{Using natbib package with 'numbers' citation style.}
+ \usepackage[numbers,sort&compress,square]{natbib}
+\fi
+\setlength{\bibsep}{3pt plus .5pt minus .25pt}
+
+\fi
+
+\def \bibfont {\small}
+
+% Categories
+% ----------
+
+
+\@setflag \@firstcategory = \@true
+
+\newcommand{\category}[3]{%
+ \if \@firstcategory
+ \paragraph*{Categories and Subject Descriptors}%
+ \@setflag \@firstcategory = \@false
+ \else
+ \unskip ;\hspace{.75em}%
+ \fi
+ \@ifnextchar [{\@category{#1}{#2}{#3}}{\@category{#1}{#2}{#3}[]}}
+
+\def \@category #1#2#3[#4]{%
+ {\let \and = \relax
+ #1 [\textit{#2}]%
+ \if \@emptyargp{#4}%
+ \if \@notp{\@emptyargp{#3}}: #3\fi
+ \else
+ :\space
+ \if \@notp{\@emptyargp{#3}}#3---\fi
+ \textrm{#4}%
+ \fi}}
+
+% Copyright Notice
+% --------- ------
+
+
+\def \ftype at copyrightbox {8}
+\def \@toappear {}
+\def \@permission {}
+\def \@reprintprice {}
+
+\def \@copyrightspace {%
+ \@float{copyrightbox}[b]%
+ \vbox to 1in{%
+ \vfill
+ \parbox[b]{20pc}{%
+ \scriptsize
+ \if \@preprint
+ [Copyright notice will appear here
+ once 'preprint' option is removed.]\par
+ \else
+ \@toappear
+ \fi
+ \if \@reprint
+ \noindent Reprinted from \@conferencename,
+ \@proceedings,
+ \@conferenceinfo,
+ pp.~\number\thepage--\pageref{sigplanconf at finalpage}.\par
+ \fi}}%
+ \end at float}
+
+\long\def \toappear #1{%
+ \def \@toappear {#1}}
+
+\toappear{%
+ \noindent \@permission \par
+ \vspace{2pt}
+ \noindent \textsl{\@conferencename}\quad \@conferenceinfo \par
+ \noindent Copyright \copyright\ \@copyrightyear\ ACM \@copyrightdata
+ \dots \@reprintprice\par}
+
+\newcommand{\permission}[1]{%
+ \gdef \@permission {#1}}
+
+\permission{%
+ Permission to make digital or hard copies of all or
+ part of this work for personal or classroom use is granted without
+ fee provided that copies are not made or distributed for profit or
+ commercial advantage and that copies bear this notice and the full
+ citation on the first page. To copy otherwise, to republish, to
+ post on servers or to redistribute to lists, requires prior specific
+ permission and/or a fee.}
+
+% Here we have some alternate permission statements and copyright lines:
+
+\newcommand{\ACMCanadapermission}{%
+ \permission{%
+ Copyright \@copyrightyear\ Association for Computing Machinery.
+ ACM acknowledges that
+ this contribution was authored or co-authored by an affiliate of the
+ National Research Council of Canada (NRC).
+ As such, the Crown in Right of
+ Canada retains an equal interest in the copyright, however granting
+ nonexclusive, royalty-free right to publish or reproduce this article,
+ or to allow others to do so, provided that clear attribution
+ is also given to the authors and the NRC.}}
+
+\newcommand{\ACMUSpermission}{%
+ \permission{%
+ Copyright \@copyrightyear\ Association for
+ Computing Machinery. ACM acknowledges that
+ this contribution was authored or co-authored
+ by a contractor or affiliate
+ of the U.S. Government. As such, the Government retains a nonexclusive,
+ royalty-free right to publish or reproduce this article,
+ or to allow others to do so, for Government purposes only.}}
+
+\newcommand{\authorpermission}{%
+ \permission{%
+ Copyright is held by the author/owner(s).}
+ \toappear{%
+ \noindent \@permission \par
+ \vspace{2pt}
+ \noindent \textsl{\@conferencename}\quad \@conferenceinfo \par
+ ACM \@copyrightdata.}}
+
+\newcommand{\Sunpermission}{%
+ \permission{%
+ Copyright is held by Sun Microsystems, Inc.}%
+ \toappear{%
+ \noindent \@permission \par
+ \vspace{2pt}
+ \noindent \textsl{\@conferencename}\quad \@conferenceinfo \par
+ ACM \@copyrightdata.}}
+
+\newcommand{\USpublicpermission}{%
+ \permission{%
+ This paper is authored by an employee(s) of the United States
+ Government and is in the public domain.}%
+ \toappear{%
+ \noindent \@permission \par
+ \vspace{2pt}
+ \noindent \textsl{\@conferencename}\quad \@conferenceinfo \par
+ ACM \@copyrightdata.}}
+
+\newcommand{\reprintprice}[1]{%
+ \gdef \@reprintprice {#1}}
+
+\reprintprice{\$10.00}
+
+% Enunciations
+% ------------
+
+
+\def \@begintheorem #1#2{% {name}{number}
+ \trivlist
+ \item[\hskip \labelsep \textsc{#1 #2.}]%
+ \itshape\selectfont
+ \ignorespaces}
+
+\def \@opargbegintheorem #1#2#3{% {name}{number}{title}
+ \trivlist
+ \item[%
+ \hskip\labelsep \textsc{#1\ #2}%
+ \if \@notp{\@emptyargp{#3}}\nut (#3).\fi]%
+ \itshape\selectfont
+ \ignorespaces}
+
+% Figures
+% -------
+
+
+\@setflag \@caprule = \@true
+
+\long\def \@makecaption #1#2{%
+ \addvspace{4pt}
+ \if \@caprule
+ \hrule width \hsize height .33pt
+ \vspace{4pt}
+ \fi
+ \setbox \@tempboxa = \hbox{\@setfigurenumber{#1.}\nut #2}%
+ \if \@dimgtrp{\wd\@tempboxa}{\hsize}%
+ \noindent \@setfigurenumber{#1.}\nut #2\par
+ \else
+ \centerline{\box\@tempboxa}%
+ \fi}
+
+\newcommand{\nocaptionrule}{%
+ \@setflag \@caprule = \@false}
+
+\def \@setfigurenumber #1{%
+ {\rmfamily \bfseries \selectfont #1}}
+
+% Hierarchy
+% ---------
+
+
+\setcounter{secnumdepth}{\@numheaddepth}
+
+\newskip{\@sectionaboveskip}
+\setvspace{\@sectionaboveskip}{10pt plus 3pt minus 2pt}
+
+\newskip{\@sectionbelowskip}
+\if \@blockstyle
+ \setlength{\@sectionbelowskip}{0.1pt}%
+\else
+ \setlength{\@sectionbelowskip}{4pt}%
+\fi
+
+\renewcommand{\section}{%
+ \@startsection
+ {section}%
+ {1}%
+ {0pt}%
+ {-\@sectionaboveskip}%
+ {\@sectionbelowskip}%
+ {\large \bfseries \raggedright}}
+
+\newskip{\@subsectionaboveskip}
+\setvspace{\@subsectionaboveskip}{8pt plus 2pt minus 2pt}
+
+\newskip{\@subsectionbelowskip}
+\if \@blockstyle
+ \setlength{\@subsectionbelowskip}{0.1pt}%
+\else
+ \setlength{\@subsectionbelowskip}{4pt}%
+\fi
+
+\renewcommand{\subsection}{%
+ \@startsection%
+ {subsection}%
+ {2}%
+ {0pt}%
+ {-\@subsectionaboveskip}%
+ {\@subsectionbelowskip}%
+ {\normalsize \bfseries \raggedright}}
+
+\renewcommand{\subsubsection}{%
+ \@startsection%
+ {subsubsection}%
+ {3}%
+ {0pt}%
+ {-\@subsectionaboveskip}
+ {\@subsectionbelowskip}%
+ {\normalsize \bfseries \raggedright}}
+
+\newskip{\@paragraphaboveskip}
+\setvspace{\@paragraphaboveskip}{6pt plus 2pt minus 2pt}
+
+\renewcommand{\paragraph}{%
+ \@startsection%
+ {paragraph}%
+ {4}%
+ {0pt}%
+ {\@paragraphaboveskip}
+ {-1em}%
+ {\normalsize \bfseries \if \@times \itshape \fi}}
+
+\renewcommand{\subparagraph}{%
+ \@startsection%
+ {subparagraph}%
+ {4}%
+ {0pt}%
+ {\@paragraphaboveskip}
+ {-1em}%
+ {\normalsize \itshape}}
+
+% Standard headings:
+
+\newcommand{\acks}{\section*{Acknowledgments}}
+
+\newcommand{\keywords}{\paragraph*{Keywords}}
+
+\newcommand{\terms}{\paragraph*{General Terms}}
+
+% Identification
+% --------------
+
+
+\def \@conferencename {}
+\def \@conferenceinfo {}
+\def \@copyrightyear {}
+\def \@copyrightdata {[to be supplied]}
+\def \@proceedings {[Unknown Proceedings]}
+
+
+\newcommand{\conferenceinfo}[2]{%
+ \gdef \@conferencename {#1}%
+ \gdef \@conferenceinfo {#2}}
+
+\newcommand{\copyrightyear}[1]{%
+ \gdef \@copyrightyear {#1}}
+
+\let \CopyrightYear = \copyrightyear
+
+\newcommand{\copyrightdata}[1]{%
+ \gdef \@copyrightdata {#1}}
+
+\let \crdata = \copyrightdata
+
+\newcommand{\proceedings}[1]{%
+ \gdef \@proceedings {#1}}
+
+% Lists
+% -----
+
+
+\setlength{\leftmargini}{13pt}
+\setlength\leftmarginii{13pt}
+\setlength\leftmarginiii{13pt}
+\setlength\leftmarginiv{13pt}
+\setlength{\labelsep}{3.5pt}
+
+\setlength{\topsep}{\standardvspace}
+\if \@blockstyle
+ \setlength{\itemsep}{1pt}
+ \setlength{\parsep}{3pt}
+\else
+ \setlength{\itemsep}{1pt}
+ \setlength{\parsep}{3pt}
+\fi
+
+\renewcommand{\labelitemi}{{\small \centeroncapheight{\textbullet}}}
+\renewcommand{\labelitemii}{\centeroncapheight{\rule{2.5pt}{2.5pt}}}
+\renewcommand{\labelitemiii}{$-$}
+\renewcommand{\labelitemiv}{{\Large \textperiodcentered}}
+
+\renewcommand{\@listi}{%
+ \leftmargin = \leftmargini
+ \listparindent = 0pt}
+%%% \itemsep = 1pt
+%%% \parsep = 3pt}
+%%% \listparindent = \parindent}
+
+\let \@listI = \@listi
+
+\renewcommand{\@listii}{%
+ \leftmargin = \leftmarginii
+ \topsep = 1pt
+ \labelwidth = \leftmarginii
+ \advance \labelwidth by -\labelsep
+ \listparindent = \parindent}
+
+\renewcommand{\@listiii}{%
+ \leftmargin = \leftmarginiii
+ \labelwidth = \leftmarginiii
+ \advance \labelwidth by -\labelsep
+ \listparindent = \parindent}
+
+\renewcommand{\@listiv}{%
+ \leftmargin = \leftmarginiv
+ \labelwidth = \leftmarginiv
+ \advance \labelwidth by -\labelsep
+ \listparindent = \parindent}
+
+% Mathematics
+% -----------
+
+
+\def \theequation {\arabic{equation}}
+
+% Miscellaneous
+% -------------
+
+
+\newcommand{\balancecolumns}{%
+ \vfill\eject
+ \global\@colht = \textheight
+ \global\ht\@cclv = \textheight}
+
+\newcommand{\nut}{\hspace{.5em}}
+
+\newcommand{\softraggedright}{%
+ \let \\ = \@centercr
+ \leftskip = 0pt
+ \rightskip = 0pt plus 10pt}
+
+% Program Code
+% ------- ----
+
+
+\newcommand{\mono}[1]{%
+ {\@tempdima = \fontdimen2\font
+ \texttt{\spaceskip = 1.1\@tempdima #1}}}
+
+% Running Heads and Feet
+% ------- ----- --- ----
+
+
+\def \@preprintfooter {}
+
+\newcommand{\preprintfooter}[1]{%
+ \gdef \@preprintfooter {#1}}
+
+\if \@preprint
+
+\def \ps at plain {%
+ \let \@mkboth = \@gobbletwo
+ \let \@evenhead = \@empty
+ \def \@evenfoot {\scriptsize \textit{\@preprintfooter}\hfil \thepage \hfil
+ \textit{\@formatyear}}%
+ \let \@oddhead = \@empty
+ \let \@oddfoot = \@evenfoot}
+
+\else\if \@reprint
+
+\def \ps at plain {%
+ \let \@mkboth = \@gobbletwo
+ \let \@evenhead = \@empty
+ \def \@evenfoot {\scriptsize \hfil \thepage \hfil}%
+ \let \@oddhead = \@empty
+ \let \@oddfoot = \@evenfoot}
+
+\else
+
+\let \ps at plain = \ps at empty
+\let \ps at headings = \ps at empty
+\let \ps at myheadings = \ps at empty
+
+\fi\fi
+
+\def \@formatyear {%
+ \number\year/\number\month/\number\day}
+
+% Special Characters
+% ------- ----------
+
+
+\DeclareRobustCommand{\euro}{%
+ \protect{\rlap{=}}{\sf \kern .1em C}}
+
+% Title Page
+% ----- ----
+
+
+\@setflag \@addauthorsdone = \@false
+
+\def \@titletext {\@latex at error{No title was provided}{}}
+\def \@subtitletext {}
+
+\newcount{\@authorcount}
+
+\newcount{\@titlenotecount}
+\newtoks{\@titlenotetext}
+
+\def \@titlebanner {}
+
+\renewcommand{\title}[1]{%
+ \gdef \@titletext {#1}}
+
+\newcommand{\subtitle}[1]{%
+ \gdef \@subtitletext {#1}}
+
+\newcommand{\authorinfo}[3]{% {names}{affiliation}{email/URL}
+ \global\@increment \@authorcount
+ \@withname\gdef {\@authorname\romannumeral\@authorcount}{#1}%
+ \@withname\gdef {\@authoraffil\romannumeral\@authorcount}{#2}%
+ \@withname\gdef {\@authoremail\romannumeral\@authorcount}{#3}}
+
+\renewcommand{\author}[1]{%
+ \@latex at error{The \string\author\space command is obsolete;
+ use \string\authorinfo}{}}
+
+\newcommand{\titlebanner}[1]{%
+ \gdef \@titlebanner {#1}}
+
+\renewcommand{\maketitle}{%
+ \pagestyle{plain}%
+ \if \@onecolumn
+ {\hsize = \standardtextwidth
+ \@maketitle}%
+ \else
+ \twocolumn[\@maketitle]%
+ \fi
+ \@placetitlenotes
+ \if \@copyrightwanted \@copyrightspace \fi}
+
+\def \@maketitle {%
+ \begin{center}
+ \@settitlebanner
+ \let \thanks = \titlenote
+ {\leftskip = 0pt plus 0.25\linewidth
+ \rightskip = 0pt plus 0.25 \linewidth
+ \parfillskip = 0pt
+ \spaceskip = .7em
+ \noindent \LARGE \bfseries \@titletext \par}
+ \vskip 6pt
+ \noindent \Large \@subtitletext \par
+ \vskip 12pt
+ \ifcase \@authorcount
+ \@latex at error{No authors were specified for this paper}{}\or
+ \@titleauthors{i}{}{}\or
+ \@titleauthors{i}{ii}{}\or
+ \@titleauthors{i}{ii}{iii}\or
+ \@titleauthors{i}{ii}{iii}\@titleauthors{iv}{}{}\or
+ \@titleauthors{i}{ii}{iii}\@titleauthors{iv}{v}{}\or
+ \@titleauthors{i}{ii}{iii}\@titleauthors{iv}{v}{vi}\or
+ \@titleauthors{i}{ii}{iii}\@titleauthors{iv}{v}{vi}%
+ \@titleauthors{vii}{}{}\or
+ \@titleauthors{i}{ii}{iii}\@titleauthors{iv}{v}{vi}%
+ \@titleauthors{vii}{viii}{}\or
+ \@titleauthors{i}{ii}{iii}\@titleauthors{iv}{v}{vi}%
+ \@titleauthors{vii}{viii}{ix}\or
+ \@titleauthors{i}{ii}{iii}\@titleauthors{iv}{v}{vi}%
+ \@titleauthors{vii}{viii}{ix}\@titleauthors{x}{}{}\or
+ \@titleauthors{i}{ii}{iii}\@titleauthors{iv}{v}{vi}%
+ \@titleauthors{vii}{viii}{ix}\@titleauthors{x}{xi}{}\or
+ \@titleauthors{i}{ii}{iii}\@titleauthors{iv}{v}{vi}%
+ \@titleauthors{vii}{viii}{ix}\@titleauthors{x}{xi}{xii}%
+ \else
+ \@latex at error{Cannot handle more than 12 authors}{}%
+ \fi
+ \vspace{1.75pc}
+ \end{center}}
+
+\def \@settitlebanner {%
+ \if \@andp{\@preprint}{\@notp{\@emptydefp{\@titlebanner}}}%
+ \vbox to 0pt{%
+ \vskip -32pt
+ \noindent \textbf{\@titlebanner}\par
+ \vss}%
+ \nointerlineskip
+ \fi}
+
+\def \@titleauthors #1#2#3{%
+ \if \@andp{\@emptyargp{#2}}{\@emptyargp{#3}}%
+ \noindent \@setauthor{40pc}{#1}{\@false}\par
+ \else\if \@emptyargp{#3}%
+ \noindent \@setauthor{17pc}{#1}{\@false}\hspace{3pc}%
+ \@setauthor{17pc}{#2}{\@false}\par
+ \else
+ \noindent \@setauthor{12.5pc}{#1}{\@false}\hspace{2pc}%
+ \@setauthor{12.5pc}{#2}{\@false}\hspace{2pc}%
+ \@setauthor{12.5pc}{#3}{\@true}\par
+ \relax
+ \fi\fi
+ \vspace{20pt}}
+
+\def \@setauthor #1#2#3{% {width}{text}{unused}
+ \vtop{%
+ \def \and {%
+ \hspace{16pt}}
+ \hsize = #1
+ \normalfont
+ \centering
+ \large \@name{\@authorname#2}\par
+ \vspace{5pt}
+ \normalsize \@name{\@authoraffil#2}\par
+ \vspace{2pt}
+ \textsf{\@name{\@authoremail#2}}\par}}
+
+\def \@maybetitlenote #1{%
+ \if \@andp{#1}{\@gtrp{\@authorcount}{3}}%
+ \titlenote{See page~\pageref{@addauthors} for additional authors.}%
+ \fi}
+
+\newtoks{\@fnmark}
+
+\newcommand{\titlenote}[1]{%
+ \global\@increment \@titlenotecount
+ \ifcase \@titlenotecount \relax \or
+ \@fnmark = {\ast}\or
+ \@fnmark = {\dagger}\or
+ \@fnmark = {\ddagger}\or
+ \@fnmark = {\S}\or
+ \@fnmark = {\P}\or
+ \@fnmark = {\ast\ast}%
+ \fi
+ \,$^{\the\@fnmark}$%
+ \edef \reserved at a {\noexpand\@appendtotext{%
+ \noexpand\@titlefootnote{\the\@fnmark}}}%
+ \reserved at a{#1}}
+
+\def \@appendtotext #1#2{%
+ \global\@titlenotetext = \expandafter{\the\@titlenotetext #1{#2}}}
+
+\newcount{\@authori}
+
+\iffalse
+\def \additionalauthors {%
+ \if \@gtrp{\@authorcount}{3}%
+ \section{Additional Authors}%
+ \label{@addauthors}%
+ \noindent
+ \@authori = 4
+ {\let \\ = ,%
+ \loop
+ \textbf{\@name{\@authorname\romannumeral\@authori}},
+ \@name{\@authoraffil\romannumeral\@authori},
+ email: \@name{\@authoremail\romannumeral\@authori}.%
+ \@increment \@authori
+ \if \@notp{\@gtrp{\@authori}{\@authorcount}} \repeat}%
+ \par
+ \fi
+ \global\@setflag \@addauthorsdone = \@true}
+\fi
+
+\let \addauthorsection = \additionalauthors
+
+\def \@placetitlenotes {
+ \the\@titlenotetext}
+
+% Utilities
+% ---------
+
+
+\newcommand{\centeroncapheight}[1]{%
+ {\setbox\@tempboxa = \hbox{#1}%
+ \@measurecapheight{\@tempdima}% % Calculate ht(CAP) - ht(text)
+ \advance \@tempdima by -\ht\@tempboxa % ------------------
+ \divide \@tempdima by 2 % 2
+ \raise \@tempdima \box\@tempboxa}}
+
+\newbox{\@measbox}
+
+\def \@measurecapheight #1{% {\dimen}
+ \setbox\@measbox = \hbox{ABCDEFGHIJKLMNOPQRSTUVWXYZ}%
+ #1 = \ht\@measbox}
+
+\long\def \@titlefootnote #1#2{%
+ \insert\footins{%
+ \reset at font\footnotesize
+ \interlinepenalty\interfootnotelinepenalty
+ \splittopskip\footnotesep
+ \splitmaxdepth \dp\strutbox \floatingpenalty \@MM
+ \hsize\columnwidth \@parboxrestore
+%%% \protected at edef\@currentlabel{%
+%%% \csname p at footnote\endcsname\@thefnmark}%
+ \color at begingroup
+ \def \@makefnmark {$^{#1}$}%
+ \@makefntext{%
+ \rule\z@\footnotesep\ignorespaces#2\@finalstrut\strutbox}%
+ \color at endgroup}}
+
+% LaTeX Modifications
+% ----- -------------
+
+\def \@seccntformat #1{%
+ \@name{\the#1}%
+ \@expandaftertwice\@seccntformata \csname the#1\endcsname.\@mark
+ \quad}
+
+\def \@seccntformata #1.#2\@mark{%
+ \if \@emptyargp{#2}.\fi}
+
+% Revision History
+% -------- -------
+
+
+% Date Person Ver. Change
+% ---- ------ ---- ------
+
+% 2004.09.12 PCA 0.1--5 Preliminary development.
+
+% 2004.11.18 PCA 0.5 Start beta testing.
+
+% 2004.11.19 PCA 0.6 Obsolete \author and replace with
+% \authorinfo.
+% Add 'nocopyrightspace' option.
+% Compress article opener spacing.
+% Add 'mathtime' option.
+% Increase text height by 6 points.
+
+% 2004.11.28 PCA 0.7 Add 'cm/computermodern' options.
+% Change default to Times text.
+
+% 2004.12.14 PCA 0.8 Remove use of mathptm.sty; it cannot
+% coexist with latexsym or amssymb.
+
+% 2005.01.20 PCA 0.9 Rename class file to sigplanconf.cls.
+
+% 2005.03.05 PCA 0.91 Change default copyright data.
+
+% 2005.03.06 PCA 0.92 Add at-signs to some macro names.
+
+% 2005.03.07 PCA 0.93 The 'onecolumn' option defaults to '11pt',
+% and it uses the full type width.
+
+% 2005.03.15 PCA 0.94 Add at-signs to more macro names.
+% Allow margin paragraphs during review.
+
+% 2005.03.22 PCA 0.95 Implement \euro.
+% Remove proof and newdef environments.
+
+% 2005.05.06 PCA 1.0 Eliminate 'onecolumn' option.
+% Change footer to small italic and eliminate
+% left portion if no \preprintfooter.
+% Eliminate copyright notice if preprint.
+% Clean up and shrink copyright box.
+
+% 2005.05.30 PCA 1.1 Add alternate permission statements.
+
+% 2005.06.29 PCA 1.1 Publish final first edition of guide.
+
+% 2005.07.14 PCA 1.2 Add \subparagraph.
+% Use block paragraphs in lists, and adjust
+% spacing between items and paragraphs.
+
+% 2006.06.22 PCA 1.3 Add 'reprint' option and associated
+% commands.
+
+% 2006.08.24 PCA 1.4 Fix bug in \maketitle case command.
+
+% 2007.03.13 PCA 1.5 The title banner only displays with the
+% 'preprint' option.
+
+% 2007.06.06 PCA 1.6 Use \bibfont in \thebibliography.
+% Add 'natbib' option to load and configure
+% the natbib package.
+
+% 2007.11.20 PCA 1.7 Balance line lengths in centered article
+% title (thanks to Norman Ramsey).
+
+% 2009.01.26 PCA 1.8 Change natbib \bibpunct values.
+
+% 2009.03.24 PCA 1.9 Change natbib to use the 'numbers' option.
+% Change templates to use 'natbib' option.
+
+% 2009.09.01 PCA 2.0 Add \reprintprice command (suggested by
+% Stephen Chong).
+
+% 2009.09.08 PCA 2.1 Make 'natbib' the default; add 'nonatbib'.
+% SB Add 'authoryear' and 'numbers' (default) to
+% control citation style when using natbib.
+% Add \bibpunct to change punctuation for
+% 'authoryear' style.
+
+% 2009.09.21 PCA 2.2 Add \softraggedright to the thebibliography
+% environment. Also add to template so it will
+% happen with natbib.
+
+% 2009.09.30 PCA 2.3 Remove \softraggedright from thebibliography.
+% Just include in the template.
+
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