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Author SHA1 Message Date
Sam Parker 487ab86942 [ARM] Allow unrolling of multi-block loops. 
Before, loop unrolling was only enabled for loops with a single
block. This restriction has been removed and replaced by:
- allow a maximum of two exiting blocks,
- a four basic block limit for cores with a branch predictor.

Differential Revision: https://reviews.llvm.org/D38952

llvm-svn: 316313
 2017-10-23 08:05:14 +00:00
Sam Parker 84fd0c3bf2 [ARM] Improve loop unrolling for Cortex-M 
- Set the default runtime unroll count to 4 and use the newly added
  UnrollRemainder option.
- Create loop cost and force unroll for a cost less than 12.
- Disable unrolling on Thumb1 only targets.

Differential Revision: https://reviews.llvm.org/D36134

llvm-svn: 310997
 2017-08-16 07:42:44 +00:00
Sam Parker 19a08e42a8 [ARM] Enable partial and runtime unrolling 
Enable runtime and partial loop unrolling of simple loops without
calls on M-class cores. The thresholds are calculated based on
whether the target is Thumb or Thumb-2.

Differential Revision: https://reviews.llvm.org/D34619

llvm-svn: 308956
 2017-07-25 08:51:30 +00:00