ART: Implement scalar loop peeling.

Implement scalar loop peeling for invariant exits elimination
(on arm64). If the loop exit condition is loop invariant then
loop peeling + GVN + DCE can eliminate this exit in the loop
body. Note: GVN and DCE aren't applied during loop optimizations.

Note: this functionality is turned off by default now.

Test: test-art-host, test-art-target, boot-to-gui.

Change-Id: I98d20054a431838b452dc06bd25c075eb445960c

1 files changed, 3 insertions, 0 deletions

diff --git a/compiler/optimizing/superblock_cloner.h b/compiler/optimizing/superblock_cloner.h
index afd5a5d6e7..e0931674cb 100644
--- a/compiler/optimizing/superblock_cloner.h
+++ b/compiler/optimizing/superblock_cloner.h
@@ -372,6 +372,9 @@ class PeelUnrollSimpleHelper : public ValueObject {
   HBasicBlock* DoUnrolling() { return helper_.DoUnrolling(); }
   HLoopInformation* GetRegionToBeAdjusted() const { return helper_.GetRegionToBeAdjusted(); }
 
+  const SuperblockCloner::HBasicBlockMap* GetBasicBlockMap() const { return &bb_map_; }
+  const SuperblockCloner::HInstructionMap* GetInstructionMap() const { return &hir_map_; }
+
  private:
   SuperblockCloner::HBasicBlockMap bb_map_;
   SuperblockCloner::HInstructionMap hir_map_;