WIP Atomics

src/compiler/simplified-lowering.cc

Index: src/compiler/simplified-lowering.cc
diff --git a/src/compiler/simplified-lowering.cc b/src/compiler/simplified-lowering.cc
index 050d6ce0873211d55f179b50b1f4c1e88ef39b67..b70e128fcef4616581b198e044d2a3b9ea77ba04 100644
--- a/src/compiler/simplified-lowering.cc
+++ b/src/compiler/simplified-lowering.cc
@@ -855,6 +855,15 @@ class RepresentationSelector {
         if (lower()) lowering->DoLoadElement(node);
         break;
       }
+      case IrOpcode::kLoadElementAtomic: {
+        ElementAccess access = ElementAccessOf(node->op());
+        ProcessInput(node, 0, changer_->TypeForBasePointer(access));  // base
+        ProcessInput(node, 1, kMachInt32);                            // index
+        ProcessRemainingInputs(node, 2);
+        SetOutput(node, access.machine_type);
+        if (lower()) lowering->DoLoadElementAtomic(node);
+        break;
+      }
       case IrOpcode::kStoreElement: {
         ElementAccess access = ElementAccessOf(node->op());
         ProcessInput(node, 0, changer_->TypeForBasePointer(access));  // base
@@ -1300,6 +1309,13 @@ void SimplifiedLowering::DoLoadElement(Node* node) {
 }
 
 
+void SimplifiedLowering::DoLoadElementAtomic(Node* node) {
+  const ElementAccess& access = ElementAccessOf(node->op());
+  node->set_op(machine()->LoadAtomic(access.machine_type));
+  node->ReplaceInput(1, ComputeIndex(access, node->InputAt(1)));
+}
+
+
 void SimplifiedLowering::DoStoreElement(Node* node) {
   const ElementAccess& access = ElementAccessOf(node->op());
   Type* type = NodeProperties::GetBounds(node->InputAt(2)).upper;