'Dead code elimination' presentation slideshows

SSA

SSA. Guo, Yao. Content. SSA Introduction Converting to SSA SSA Example SSAPRE Reading Tiger Book: 19.1, 19.3 Related Papers. Prelude. SSA (Static Single-Assignment) : A program is said to be in SSA form iff Each variable is statically defined exactly only once, and

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Global optimizations

Global optimizations. Local analysis framework. Define an analysis of a basic block as a quadruple ( D , V , F , I ) where D is a direction (forwards or backwards) V is a set of values the program can have at any point

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Control Dependence

Control Dependence. Control Dependence. Introduction Formal Definition Optimal Control Dependence Computation. Example. b is control dependent on a c is control dependent on a a and d are control dependent on START. START. a. c. b. d. CFG. END. Applications of CD.

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Intro to Optimization

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CSC 8505 Compiler Construction

CSC 8505 Compiler Construction. Optimization. Compiler Code Optimizations. A Code optimizer sits between the front end and the code generator. Works with intermediate code. Can do control flow analysis. Can do data flow analysis. Does transformations to improve the intermediate code. .

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Optimizing Compiler . Scalar optimizations .

Optimizing Compiler . Scalar optimizations . . Main characteristics of the application, affecting its performance C alculations efficiency, Memory usage effectiveness, Correct branch prediction, Efficient use of vector instructions, The effectiveness of parallelization,

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Tutorial 4 - Shared Memory Consistency -

Tutorial 4 - Shared Memory Consistency -. Bogdan Simion. Assignment 1. Should determine threshold experimentally Part of the tool, not found through separate experiments and hard-coded into your program To find CPU frequency, use something like k-best measurement scheme from lecture slides

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Course Overview

Course Overview. PART I: overview material 1 Introduction 2 Language processors (tombstone diagrams, bootstrapping) 3 Architecture of a compiler PART II: inside a compiler 4 Syntax analysis 5 Contextual analysis 6 Runtime organization 7 Code generation PART III: conclusion

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State your reasons or how to keep proofs while optimizing code

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CS412/413

CS412/413. Introduction to Compilers and Translators April 7, 1999 Lecture 26: Optimizations based on data-flow analysis. Administration. Programming Assignment 4 (Iota + ) is due April 28 -- available on web. Prelim 2 April 16

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XCISE 2.0.6 Dead Code Elimination by Exploiting ASX

XCISE 2.0.6 Dead Code Elimination by Exploiting ASX. Ian Davis University of Waterloo. Capturing the build process. Wrap gcc & g++ Capture build history What program What parameters Where invoked Repeat the build process Adjusting parameters Request compilation to assembler

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Investigation of flow graphs optimization methods used in optimizing compilers

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Hardware-Software Interface

Hardware-Software Interface. Program. Machine. Available resources. Required resources. statically fixed. dynamically varying. Designed to support. Designed to run well on. X. wide variety of programs. a variety of machines. Interested in running. Interested in having.

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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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Streams-C

Streams-C. Sc2 C-to-FPGA Compiler. Maya Gokhale, Janette Frigo, Christine Ahrens, Marc Popkin-Paine Los Alamos National Laboratory Janice M. Stone Stone Ergonaut. Overview. Language C subset augmented with parallel communicating processes

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Interval Partitioning of a Flow Graph

Interval Partitioning of a Flow Graph. Input: a flow graph G = (N, E, n 0 ). Output: a partition of G into a set of disjoint intervals. Method: for each n, compute I(n). I(n) := {n}; while there exists a node m ? n 0 all of whose predecessors are in I(n) do I(n) := I(n) ? {m}

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CS 201 Compiler Construction

CS 201 Compiler Construction. Lecture 5 Code Optimizations: Copy Propagation & Elimination. Global Code Optimizations. Copy Propagation & Elimination: copy assignments are eliminated by replacing lhs variable with rhs variable.

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TARGET CODE GENERATION

TARGET CODE GENERATION. A basic block is a sequence of consecutive statements in which flow of control enters at the beginning and exit at the end. Transformation on Basic Blocks. Structure preserving transformation: 1. Common sub-expression elimination . Consider the basic block

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