1 files changed, 89 insertions, 0 deletions
diff --git a/src/jit/lowerarm.cpp b/src/jit/lowerarm.cpp
new file mode 100644
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+++ b/src/jit/lowerarm.cpp
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+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+
+/*XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
+XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
+XX                                                                           XX
+XX                           Lowering for ARM                                XX
+XX                                                                           XX
+XX  This encapsulates all the logic for lowering trees for the ARM           XX
+XX  architecture.  For a more detailed view of what is lowering, please      XX
+XX  take a look at Lower.cpp                                                 XX
+XX                                                                           XX
+XX                                                                           XX
+XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
+XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
+*/
+
+#include "jitpch.h"
+#ifdef _MSC_VER
+#pragma hdrstop
+#endif
+
+#ifndef LEGACY_BACKEND // This file is ONLY used for the RyuJIT backend that uses the linear scan register allocator
+
+// The ARM backend is not yet implemented, so the methods here are all NYI.
+// TODO-ARM-NYI: Lowering for ARM.
+#ifdef _TARGET_ARM_
+
+#include "jit.h"
+#include "lower.h"
+#include "lsra.h"
+
+/* Lowering of GT_CAST nodes */
+void Lowering::LowerCast(GenTreePtr *ppTree) { }
+
+
+void Lowering::LowerCntBlockOp(GenTreePtr *ppTree)
+{
+    NYI_ARM("ARM Lowering for BlockOp");
+}
+
+void Lowering::TreeNodeInfoInitCall(GenTree *tree, TreeNodeInfo &info, 
+                                    int &srcCount, // out 
+                                    int &dstCount  // out
+    )
+{
+    NYI_ARM("ARM TreeNodeInfoInit for Call");
+}
+
+Compiler::fgWalkResult Lowering::TreeInfoInitHelper(GenTreePtr* pTree, Compiler::fgWalkData* data)
+{
+    Lowering* lower = (Lowering*)data->pCallbackData;
+    lower->TreeNodeInfoInit(pTree, data->parent);
+    return Compiler::WALK_CONTINUE;
+}
+
+void Lowering::TreeNodeInfoInit(GenTree* stmt)
+{
+    comp->fgWalkTreePost(&stmt->gtStmt.gtStmtExpr, &Lowering::TreeInfoInitHelper, this);
+}
+
+void Lowering::TreeNodeInfoInit(GenTreePtr *pTree, GenTree* parent)
+{
+    NYI("ARM TreeNodInfoInit");
+}
+
+// returns true if the tree can use the read-modify-write memory instruction form
+bool Lowering::isRMWRegOper(GenTreePtr tree)
+{
+    return false;
+}
+
+bool Lowering::IsCallTargetInRange(void *addr)
+{
+    return comp->codeGen->validImmForBL ((ssize_t)addr);
+}
+
+// return true if the immediate can be folded into an instruction, for example small enough and non-relocatable
+bool Lowering:: IsContainableImmed(GenTree* parentNode, GenTree* childNode)
+{
+    NYI_ARM("ARM IsContainableImmed");
+    return false;
+}
+
+#endif // _TARGET_ARM_
+
+#endif // !LEGACY_BACKEND