Concurrent Start Tiling of Stencil Computations based on the Transitive Closure of a Data Dependence Graph

2015 ◽  
Vol 1 (11) ◽  
pp. 169-172 ◽  
Author(s):  
Włodzimierz BIELECKI
Keyword(s):  
Transitive Closure ◽  
Data Dependence ◽  
Dependence Graph ◽  
Stencil Computations

scholarly journals Tiling arbitrarily nested loops by means of the transitive

2016 ◽  
Vol 26 (4) ◽  
pp. 919-939 ◽  
Author(s):  
Włodzimierz Bielecki ◽  
Marek Pałkowski
Keyword(s):  
Transitive Closure ◽  
Lexicographic Order ◽  
Dependence Graph ◽  
Program Transformations ◽  
Affine Transformations ◽  
Loop Nest ◽  
Loop Nests ◽  
Novel Approach ◽  
Nested Loops ◽  
Affine Functions

Abstract A novel approach to generation of tiled code for arbitrarily nested loops is presented. It is derived via a combination of the polyhedral and iteration space slicing frameworks. Instead of program transformations represented by a set of affine functions, one for each statement, it uses the transitive closure of a loop nest dependence graph to carry out corrections of original rectangular tiles so that all dependences of the original loop nest are preserved under the lexicographic order of target tiles. Parallel tiled code can be generated on the basis of valid serial tiled code by means of applying affine transformations or transitive closure using on input an inter-tile dependence graph whose vertices are represented by target tiles while edges connect dependent target tiles. We demonstrate how a relation describing such a graph can be formed. The main merit of the presented approach in comparison with the well-known ones is that it does not require full permutability of loops to generate both serial and parallel tiled codes; this increases the scope of loop nests to be tiled.

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