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Department of Computer Science and Technology

Alias Analysis in HELIX

21 December 2015

One of the most important parts of our HELIX compiler is the data dependence analysis we run on the compiler’s IR to determine which instructions are independent of each other. You can read more about HELIX in general in our original CGO 2012 paper (click through my publications page to get free access to the ACM version).

HELIX’s initial data dependence pass is split into two phases, and it’s the memory alias analysis stage that is most interesting. This has the job of identifying the locations in memory that are read and written by each instruction so that we can respect all data dependences within the loops we parallelise. Since alias analysis is not precise, we need to...

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