Loop permutation - PowerPoint PPT Presentation

Optimizing Compilers CISC 673 Spring 2009 Dependence Analysis and Loop Transformations

Optimizing Compilers CISC 673 Spring 2009 Dependence Analysis and Loop Transformations. John Cavazos University of Delaware. Lecture Overview. Very Brief Introduction to Dependences Loop Transformations. The Big Picture. What are our goals?

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440 views • 42 slides

Data Locality

Data Locality. CS 524 – High-Performance Computing. Motivating Example: Vector Multiplication. 1 GHz processor (1 ns clock), 4 instructions per cycle, 2 multiply-add units (4 FPUs) 100 ns memory latency, no cache, 1 word transfer size Peak performance: 4/1 ns = 4 GFLOPS

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446 views • 26 slides

Data Dependences

Data Dependences. CS 524 – High-Performance Computing. Motivating Example: Superscalar Execution. Data Dependences. Fundamental execution ordering constraints: S1: a = b + c S2: d = a * 2 S3: a = c + 2 S4: e = d + c + 2 S1 must execute before S2 (flow-dependence)

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314 views • 20 slides

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