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Download Compiler Construction: 21st International Conference, CC by Ralf Karrenberg, Sebastian Hack (auth.), Michael O’Boyle PDF

By Ralf Karrenberg, Sebastian Hack (auth.), Michael O’Boyle (eds.)

This ebook constitutes the complaints of the twenty first overseas convention on Compiler development, CC 2012, held as a part of the joint ecu convention on concept and perform of software program, ETAPS 2012, which happened in Tallinn, Estonia, in March/April 2012. The thirteen papers provided during this booklet have been conscientiously reviewed and chosen from fifty one submissions. they're equipped in topical sections named: GPU optimisation, software research, gadgets and elements, and dynamic research and runtime support.

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Additional info for Compiler Construction: 21st International Conference, CC 2012, Held as Part of the European Joint Conferences on Theory and Practice of Software, ETAPS 2012, Tallinn, Estonia, March 24 – April 1, 2012. Proceedings

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In the semi-automatic mode, the programmer specifies the coarsening factor as a source-level pragma, whereas in the automatic method thread granularity is determined using a compiler heuristic. In both cases, we verify the legality of the coarsening transformation. To this end, we develop a generalized dependence analysis framework that allows fast analysis of CUDA programs. The analysis is based on the observation that the CUDA programming model enforces certain restrictions on thread execution, which are not enforced on mutlithreaded code for CPUs.

N, p ∈ {Cx + 1, . . , T }, q ∈ {1, . . , N, p ∈ {Cx + 1, . . , T }, q ∈ {1, . . , Cx } ∃ S(k,p) S(j,p−q) , where k ∈ {j + 1, . . , N } (3) Constraint (2) describes the situation where we have no dependence between statement instances within the coarsening range. Note, we are only concerned Automatic Restructuring of GPU Kernels 29 about dependences that emanate from a higher numbered thread. For the coarsening transformation, dependences that emanate from a lower numbered thread is irrelevant, since, by default, all statement instances in p get executed after the last statement in q, where p > q.

5 over the baseline version. We also note that performance degrades (below the baseline) for larger coarsening factors when coarsening along the X dimension. This indicates that there is not enough inter-thread locality along this dimension to outweigh the costs of lower occupancy. Therefore, it is important to consider data locality in other dimensions when coarsening. Performance Sensitivity. Although thread coarsening helps in improving performance, it is not guaranteed that performance will always increase.

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