Optimizing/ARM: Implement kDexCachePcRelative dispatch.
Change-Id: I0fe2da50a30a3f62bec8ea01688dd1fec84b1831
diff --git a/compiler/optimizing/nodes_arm.h b/compiler/optimizing/nodes_arm.h
new file mode 100644
index 0000000..6a1dbb9
--- /dev/null
+++ b/compiler/optimizing/nodes_arm.h
@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ART_COMPILER_OPTIMIZING_NODES_ARM_H_
+#define ART_COMPILER_OPTIMIZING_NODES_ARM_H_
+
+namespace art {
+
+class HArmDexCacheArraysBase : public HExpression<0> {
+ public:
+ explicit HArmDexCacheArraysBase(const DexFile& dex_file)
+ : HExpression(Primitive::kPrimInt, SideEffects::None(), kNoDexPc),
+ dex_file_(&dex_file),
+ element_offset_(static_cast<size_t>(-1)) { }
+
+ void UpdateElementOffset(size_t element_offset) {
+ // Use the lowest offset from the requested elements so that all offsets from
+ // this base are non-negative because our assemblers emit negative-offset loads
+ // as a sequence of two or more instructions. (However, positive offsets beyond
+ // 4KiB also require two or more instructions, so this simple heuristic could
+ // be improved for cases where there is a dense cluster of elements far from
+ // the lowest offset. This is expected to be rare enough though, so we choose
+ // not to spend compile time on elaborate calculations.)
+ element_offset_ = std::min(element_offset_, element_offset);
+ }
+
+ const DexFile& GetDexFile() const {
+ return *dex_file_;
+ }
+
+ size_t GetElementOffset() const {
+ return element_offset_;
+ }
+
+ DECLARE_INSTRUCTION(ArmDexCacheArraysBase);
+
+ private:
+ const DexFile* dex_file_;
+ size_t element_offset_;
+
+ DISALLOW_COPY_AND_ASSIGN(HArmDexCacheArraysBase);
+};
+
+} // namespace art
+
+#endif // ART_COMPILER_OPTIMIZING_NODES_ARM_H_