tree 123b75849912213e06b9669f181eae835e7ea6f4
parent 8da68e57a9d1115905dfd01444914c6774b59eff
author Michael Kruse <llvm-project@meinersbur.de> 1607373572 -0600
committer Copybara-Service <copybara-worker@google.com> 1607484110 -0800

[Polly][CodeGen] Remove use of ScalarEvolution.

ScalarEvolution::getSCEV cannot be used during codegen. ScalarEvolution
assumes a stable IR and control flow which is under construction during
Polly's CodeGen. In particular, it uses DominatorTree for compute the
backedge taken count. However the DominatorTree is not updated during
codegen.

In this case, SCEV was used to determine the base pointer of an array
access. Replace it by our own function. Polly generates only GEP and
BitCasts for array acceses, i.e. it is sufficient to handle these to to
find the base pointer.

Fixes llvm.org/PR48422

GitOrigin-RevId: 6249bfeefeed7ee2634355d4d7523b46fb00fda6