ART: Naive NullCheck elimination in InstructionBuilder
Save a little bit of memory by not generating trivially redundant
HNullCheck instructions. This patch builds on the fact that the
InstructionBuilder now directly generates SSA form and looks at the
input of the NullCheck. For obvious cases, such as NewInstance/Array
or `this`, the NullCheck generation is completely avoided.
Bug: 28173563
Change-Id: I1fdf3b096c7a939f7b8586c02a2a6b44dfa43443
diff --git a/compiler/optimizing/instruction_builder.h b/compiler/optimizing/instruction_builder.h
index 070f7da..0e3e5a7 100644
--- a/compiler/optimizing/instruction_builder.h
+++ b/compiler/optimizing/instruction_builder.h
@@ -87,6 +87,7 @@
ArenaVector<HInstruction*>* GetLocalsFor(HBasicBlock* block);
HInstruction* ValueOfLocalAt(HBasicBlock* block, size_t local);
HInstruction* LoadLocal(uint32_t register_index, Primitive::Type type) const;
+ HInstruction* LoadNullCheckedLocal(uint32_t register_index, uint32_t dex_pc);
void UpdateLocal(uint32_t register_index, HInstruction* instruction);
void AppendInstruction(HInstruction* instruction);