'Common subexpression elimination' diaporamas de présentation

Konstrukce p řekladačů

Konstrukce p řekladačů. David Bednárek www.ksi.mff.cuni.cz. Pravidla studia. SWI109 2/ 1 Z,Zk. Pravidla studia. Cvičení Každých 14 dní Zápis v SIS Z ápočtové testy Hromadný termín na cvičení koncem semestru Opravné termíny individuálně ve zkušebních termínech

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Inside Synchronization

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IL for Arrays & Local Optimizations

IL for Arrays & Local Optimizations. Lecture 26 (Adapted from notes by R. Bodik and G. Necula). Multi-dimensional Arrays. A 2D array is a 1D array of 1D arrays Java uses arrays of pointers to arrays for >1D arrays.

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Data-Flow Analysis II

Data-Flow Analysis II. CS 671 March 13, 2008. Data-Flow Analysis. Gather conservative, approximate information about what a program does Result: some property that holds every time the instruction executes The Data-Flow Abstraction Execution of an instruction transforms program state

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Data flow analysis

Data flow analysis. Goal : collect information about how a procedure manipulates its data This information is used in various optimizations For example, knowledge about what expressions are available at some point helps in common subexpression elimination. IMPORTANT!

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SOFTWARE DESIGN FOR LOW POWER

SOFTWARE DESIGN FOR LOW POWER . Dr. Elwin chandra monieb. Software Power Issues. Upto 40% of the on-chip power is dissipated on the buses ! System Software : OS, BIOS, Compilers Software can affect energy consumption at various levels Inter-Instruction Effects

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Are We Trading Consistency Too Easily? A Case for Sequential Consistency

Madan Musuvathi Microsoft Research. Dan Marino Todd Millstein. Abhay Singh Satish Narayanasamy. UCLA. University of Michigan. Are We Trading Consistency Too Easily? A Case for Sequential Consistency. Memory Consistency Model. Abstracts the program runtime (compiler + hardware)

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Java for High Performance Computing

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Java for High Performance Computing

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Machine-Independent Optimization

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Global optimization

Global optimization. Honors Compilers April 16 th 2002. Data flow analysis. To generate better code, need to examine definitions and uses of variables beyond basic blocks. With use-definition information, various optimizing transformations can be performed: Common subexpression elimination

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Register allocation

Register allocation. Consists of two parts: register allocation What will be stored in registers Only unambiguous values register assignment Which register will be assigned to each variable? Goal : minimize spills How hard is it? BB w/ one size of data: polynomial otherwise, NP-complete

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Optimizations (continue): Common subexpression elimination Code motion Strngth reduction

Optimizations (continue): Common subexpression elimination Code motion Strngth reduction Induction variable elimination Instruction selection Register allocation. Branch chaining: While c do if a then b:. L2: c If (c = false) goto L3 a If (a = false) goto L1

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Lecture 27

Lecture 27. Optimization. Program Optimization. More than one way to compute the result Optimization produces equivalent program that is Smaller Faster Optimization has two components Program analysis Transformation Optimization is conservative

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