[PATCH] D36134: [ARM] Improve loop unrolling for Cortex-M

[Sam Parker via Phabricator via llvm-commits]

samparker created this revision.
Herald added subscribers: kristof.beyls, javed.absar, aemerson.

Override the default unroll count using 2, or 4 if the core provides a branch predictor. Unrolling is also now forced, for small loops, and the unroll count is set to 4 for loops that SCEV doesn't comprehend.


https://reviews.llvm.org/D36134

Files:
  lib/Target/ARM/ARM.td
  lib/Target/ARM/ARMTargetTransformInfo.cpp
  test/Transforms/LoopUnroll/ARM/loop-unrolling.ll

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