Combining Retiming and Scheduling Techniques for Loop Parallelization and Loop Tiling Ecole Normale Supérieure De Lyon Combining Retiming and Scheduling Techniques for Loop Parallelization and Loop Tiling Combining Retiming and Scheduling Techniques for Loop Parallelization and Loop Tiling

Tiling is a technique used for exploitingmedium grain parallelism in nested loops It relies on a rst step that detects sets of permutable nested loops All algorithms developed so far consider the statements of the loop body as a single block in other words they are not able to take advantage of the structure of dependences between di erent statements In this report we overcome this limitation by showing how the structure of the reduced dependence graph can be taken into account for detecting more permutable loops Our method combines graph retiming techniques and graph scheduling techniques It can be viewed as an extension of Wolf and Lam s algorithm to the case of loops with multiple statements Loop independent dependences play a particular role in our study and we show how the way we handle them can be useful for ne grain loop parallelization as well