[turbofan] Add checked load/store operators.

src/compiler/arm/instruction-selector-arm.cc

Index: src/compiler/arm/instruction-selector-arm.cc
diff --git a/src/compiler/arm/instruction-selector-arm.cc b/src/compiler/arm/instruction-selector-arm.cc
index 7d3243e614bcc4665d9354ac8c38353630477e7e..52acdc85f81d7ddf1a9921d0087ce27e1f2e652e 100644
--- a/src/compiler/arm/instruction-selector-arm.cc
+++ b/src/compiler/arm/instruction-selector-arm.cc
@@ -350,6 +350,82 @@ void InstructionSelector::VisitStore(Node* node) {
 }
 
 
+void InstructionSelector::VisitCheckedLoad(Node* node) {
+  MachineType rep = RepresentationOf(OpParameter<MachineType>(node));
+  MachineType typ = TypeOf(OpParameter<MachineType>(node));
+  ArmOperandGenerator g(this);
+  Node* const buffer = node->InputAt(0);
+  Node* const offset = node->InputAt(1);
+  Node* const length = node->InputAt(2);
+  ArchOpcode opcode;
+  switch (rep) {
+    case kRepWord8:
+      opcode = typ == kTypeInt32 ? kCheckedLoadInt8 : kCheckedLoadUint8;
+      break;
+    case kRepWord16:
+      opcode = typ == kTypeInt32 ? kCheckedLoadInt16 : kCheckedLoadUint16;
+      break;
+    case kRepWord32:
+      opcode = kCheckedLoadWord32;
+      break;
+    case kRepFloat32:
+      opcode = kCheckedLoadFloat32;
+      break;
+    case kRepFloat64:
+      opcode = kCheckedLoadFloat64;
+      break;
+    default:
+      UNREACHABLE();
+      return;
+  }
+  InstructionOperand* offset_operand = g.UseRegister(offset);
+  InstructionOperand* length_operand = g.CanBeImmediate(length, kArmCmp)
+                                           ? g.UseImmediate(length)
+                                           : g.UseRegister(length);
+  Emit(opcode | AddressingModeField::encode(kMode_Offset_RR),
+       g.DefineAsRegister(node), offset_operand, length_operand,
+       g.UseRegister(buffer), offset_operand);
+}
+
+
+void InstructionSelector::VisitCheckedStore(Node* node) {
+  MachineType rep = RepresentationOf(OpParameter<MachineType>(node));
+  ArmOperandGenerator g(this);
+  Node* const buffer = node->InputAt(0);
+  Node* const offset = node->InputAt(1);
+  Node* const length = node->InputAt(2);
+  Node* const value = node->InputAt(3);
+  ArchOpcode opcode;
+  switch (rep) {
+    case kRepWord8:
+      opcode = kCheckedStoreWord8;
+      break;
+    case kRepWord16:
+      opcode = kCheckedStoreWord16;
+      break;
+    case kRepWord32:
+      opcode = kCheckedStoreWord32;
+      break;
+    case kRepFloat32:
+      opcode = kCheckedStoreFloat32;
+      break;
+    case kRepFloat64:
+      opcode = kCheckedStoreFloat64;
+      break;
+    default:
+      UNREACHABLE();
+      return;
+  }
+  InstructionOperand* offset_operand = g.UseRegister(offset);
+  InstructionOperand* length_operand = g.CanBeImmediate(length, kArmCmp)
+                                           ? g.UseImmediate(length)
+                                           : g.UseRegister(length);
+  Emit(opcode | AddressingModeField::encode(kMode_Offset_RR), nullptr,
+       offset_operand, length_operand, g.UseRegister(value),
+       g.UseRegister(buffer), offset_operand);
+}
+
+
 namespace {
 
 void EmitBic(InstructionSelector* selector, Node* node, Node* left,