[PATCH] D67752: [ARM] Loop unrolling preferences for LOB cores

[Sam Parker via Phabricator via llvm-commits]

samparker created this revision.
samparker added reviewers: dmgreen, SjoerdMeijer.
Herald added subscribers: zzheng, kristof.beyls.

Perform loop unrolling differently for cores with low-overhead branches:

- Don't unroll the remainder loop, with the expectation that both the unrolled loop and the remainder will be converted into a loloop.
- Don't force unroll small loops as we now try to use the non-decrement form of LE for uncountable loops. We need to use CBN/Z for that optimisation, so reducing code size is important due to their limited range.


https://reviews.llvm.org/D67752

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

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