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| Tour of optimizations Dataflow analysis intro J Regehr / S Lerner Example 2 x = a + b; y = a + b; In what circumstances can (a+b) by replaced by x? This is common subexpression elimination (CSE) - replacing expressions that http://www.cs.utah.edu/classes/cs7968/lectures/03.pdf Efficient Substitution of Multiple Constant Multiplications by Shifts ... often results in a significant improvement in several key design metrics. After defining the MCM problem, we formulate it as a special case of common subexpression elimination. The http://www.cs.ucla.edu/~miodrag/papers/Potkonjak_DAC_94.pdf S-38.220 Postgraduate Course on Signal Processing in Communications ... Potkonjak, M.B Srivastava and A.P.Chandrakasan, "Multiple constant multiplication: efficient and versatile framework and algorithms for exploring common subexpression elimination http://keskus.hut.fi/opetus/s38220/f99/rpt15.pdf Certicationof Compiler Optimizations usingKleene Algebra with Tests We have essentially given purely equational proofs of the universal Horn formulas 3.2 CommonSubexpression Elimination Common subexpression elimination is a code transformation that http://ecommons.library.cornell.edu/bitstream/1813/7433/1/99-1779.pdf IEEE Transactions on Magnetics On the Implementation of Efficient Channel Filters for Wideband Receivers by Optimizing Common Subexpression Elimination Methods IEEE Transactions on Magnetics http://muir.massey.ac.nz/bitstream/10179/148/1/viewcontent.pdf Identifying Cost-Effective Common Subexpressionsto Reduce Operation ... Exhaustive search (forsmallcases) and a number of heuristics were shown to be effective in minimizing the operation count[4]. Common subexpression elimination (CSE) is a classical http://www.ece.lsu.edu/jxr/Publications-pdf/iccs06.pdf Fast, Effective Code Generation in a Just-In-Time(JIT) Java Compiler 5 Code Generation : Common Subexpression Elimination ?Java bytecode used for representing expressions Example : "X+Y" => [iload_1, iload_2, iadd] => [1b1c60] Expressions http://www.cs.ucsd.edu/classes/sp00/cse231/presentations/dpani.pdf Redundant Computation Elimination Optimizations Lecture 20 CS2210 Compiler Design 2004/5 Redundancy Elimination ? Several categories: ? Value Numbering ? local & global ? Common subexpression elimination (CSE) ? local & global ? http://www.cs.pitt.edu/%7Emock/cs2210/lectures/lecture20.pdf Machine Independent Optimizations - 2 Page 18 MachIndepOpt2, Spring 99 © B. G. Ryder Global Common Global Common Subexpression Elimination Subexpression Elimination q:=a*b z:=a*b r:=2*z u:=a*b z:=u/2 w:=a*b http://www.cs.rutgers.edu/~ryder/415/lectures/machIndepOpts2.pdf Redundant Communication Elimination Optimization in XQuery for ... QUERY OPTIMIZATION METHOD 2.1 Basic Idea Basic idea which lies under proposed optimization itself, so called Common Subexpression Elimination, is one of traditional compiler http://www.music.tuc.gr/MCDL/Proceedings/Hidaka_Paper.pdf Proof Optimization for Partial Redundancy Elimination Akadeemiatee 21, EE-12618 Tallinn, Estonia fando,tarmog@cs.ioc.ee Abstract Partial redundancy elimination is a subtle optimization which performs common subexpression elimination http://www.cs.ioc.ee/~tarmo/papers/pepm08.pdf Anticipation-based partial redundancy elimination for static single ... This transformation subsumes common subexpression elimination and loop-invariant code motion. Our contribution In this paper, we present anew algorithm fordoing PRE on an intermediate http://www.dacapo-group.org/papers/spessapre.pdf RENO: A Rename-Based Instruction Optimizer uses map-tableìshort-circuitingîtoimplementdynamicvers ionsofseveral well-known static optimizations: mo ve elimination, common subexpression elimination http://www.cis.upenn.edu/~amir/pubs/conf/reno-isca05.pdf Design, Implementation, and Evaluation of Optimizations in a Just-In ... 3.3 Common Subexpression Elimination To reduce the overhead of array accesses, the JIT compiler applies two techniques for global common subexpression elimination (CSE). http://www.sdsc.edu/~allans/cs231/openjit.pdf Code Generation Part III Classic Examples of Local and Global Code Optimizations ?Local-Constant folding-Constant combining-Strength reduction-Constant propagation-Common subexpression elimination-Backward http://www.cs.fsu.edu/~engelen/courses/COP5621/Ch9c.pdf Lecture 5 Partial Redundancy Elimination Common Subexpression Elimination ?A common expression may have different values on different paths! ?On every path reaching p, ?expression b+c has been computed ?b, c not http://suif.stanford.edu/~courses/cs243/lectures/l5.pdf Design Optimization Techniques Evaluation for High Performance ... of the coefficients to N-Power-of-Two (NPT) terms, where the maximum number of non-zero in each coefficient is taken as a constraint, followed by Common Subexpression Elimination (CSE http://www.iberchip.org/iberchip2006/ponencias/41.pdf H. G. Dietz Parallel Processing Laboratory School of Electrical ... For example, in common subexpression elimination (CSE) the compiler recognizes when the same value would be computed more than once and rewrites the code to makemultiple http://aggregate.org/KYARCH/csi.pdf Design, Implementation, and Evaluation of Optimizations in a Java ... We designed and implemented effective optimizations for a JIT compiler, such as exception check elimination, common subexpression elimination, simple type inclusion test, method http://www.cc-pe.net/iuhome/jg99papers/C444JGFSIishizakiFINAL/C444newishizaki-2nd.pdf Factoring and Eliminating Common Subexpressions in Polynomial ... However existing compiler techniques for reducing code complexity such as common subexpression elimination and value numbering are targeted towards general purpose applications and http://www.iccad.com/ Reuse Optimization 1 CS553 Lecture Reuse Optimization: Common SubExpr Elim 2 Reuse Optimization Last time-Value numbering Today-Common subexpression elimination (CSE) CS553 Lecture Reuse Optimization http://www.cs.colostate.edu/~mstrout/CS553/slides/lecture10a.pdf Common Subexpression Induction? arrays might be combined into a single operation apparently acting on a 16,384-element array. Keywords:: Common subexpression induction (CSI), common subexpression elimination (CSE), http://docs.lib.purdue.edu/cgi/viewcontent.cgi?article=1285&context=ecetr A Common Subexpression Sharing Approach forMultiplierless Synthesis of ... Yuen-Hong Alvin Ho, Chi-Un Lei and Ngai Wong * Abstract?In the context of multiple constant multiplications (MCM) design, we propose a novel common-subexpression-elimination (CSE http://www.engineeringletters.com/issues_v15/issue_1/EL_15_1_23.pdf Lecture 18: More Dataflow Analysis COS 320 Compiling Techniques Common Subexpression Elimination Common Subexpression Elimination Iterative Dataflow Analysis Framework Iterative Dataflow Analysis Framework http://www.cs.princeton.edu/courses/archive/spring07/cos320/lectures/18-MoreDFAnalysis.pdf Lecture 18: More Dataflow Analysis COS 320 Compiling Techniques More Dataflow Analysis COS 320 Compiling Techniques Princeton University Spring 2007 Prof. David August Common Subexpression Elimination Common Subexpression Elimination http://www.cs.princeton.edu/courses/archive/spring07/cos320/lectures/18-MoreDFAnalysis-3x1.pdf Common Subexpression Elimination in Automated Constraint Modelling Common Subexpression Elimination in Automated Constraint Modelling IanP. Gent and Ian Migueland Andrea Rendl 1 Abstract. Typically, there are many alternative models of a given http://www.cs.st-andrews.ac.uk/~andrea/ecai08workshop.pdf Global Common Subexpression Mowry Carnegie Mellon Lecture 6 Global Common Subexpression Elimination I Available Expressions Analysis II Eliminating CSEs Reference: Muchnick 13.1 Optimizing Compilers: http://www.cs.cmu.edu/afs/cs.cmu.edu/academic/class/15745-s03/public/lectures/L6_handouts.pdf Example of SSA form optimization Common subexpression elimination and ... Example of SSA form optimization Common subexpression elimination and aggressive optimization Source program in C /* cse_test. c */ #include int main () {int a; int b http://www.coins-project.org/050303/ssa/ssa-example-cse.pdf Common Subexpression Elimination Common Subexpression Elimination Illegal? no cse, same value number How different from value numbering? Why need temp? Local and Global Replace recomputation of expression by use http://www.cse.ucsd.edu/classes/sp02/cse231/lec8seq.pdf |
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