Revert "Revert "Enable Load Store Elimination for ARM and ARM64""
This patch refactors the implementation of the LoadStoreElimination
optimisation pass. Please note that this pass was disabled and not
functional for any of the backends.
The current implementation tracks aliases and handles DalvikRegs as well
as Heap memory regions. It has been tested and it is known to optimise
out the following:
* Load - Load
* Store - Load
* Store - Store
* Load Literals
Change-Id: I3aadb12a787164146a95bc314e85fa73ad91e12b
diff --git a/compiler/dex/quick/mir_to_lir-inl.h b/compiler/dex/quick/mir_to_lir-inl.h
index 9ce5bb7..ff5a46f 100644
--- a/compiler/dex/quick/mir_to_lir-inl.h
+++ b/compiler/dex/quick/mir_to_lir-inl.h
@@ -147,6 +147,15 @@
}
/*
+ * Clear the corresponding bit(s).
+ */
+inline void Mir2Lir::ClearRegMask(ResourceMask* mask, int reg) {
+ DCHECK_EQ((reg & ~RegStorage::kRegValMask), 0);
+ DCHECK(reginfo_map_.Get(reg) != nullptr) << "No info for 0x" << reg;
+ *mask = mask->ClearBits(reginfo_map_.Get(reg)->DefUseMask());
+}
+
+/*
* Set up the proper fields in the resource mask
*/
inline void Mir2Lir::SetupResourceMasks(LIR* lir) {