[wasm] Int64Lowering of Int64Add on ia32 and arm.

src/compiler/int64-lowering.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/int64-lowering.h"
 #include "src/compiler/common-operator.h"
 #include "src/compiler/graph.h"
 #include "src/compiler/linkage.h"
 #include "src/compiler/machine-operator.h"
 #include "src/compiler/node-properties.h"
@@ skipping 233 matching lines @@
     case IrOpcode::kTruncateInt64ToInt32: {
       DCHECK(node->InputCount() == 1);
       Node* input = node->InputAt(0);
       ReplaceNode(node, GetReplacementLow(input), nullptr);
       node->NullAllInputs();
       break;
     }
     // todo(ahaas): I added a list of missing instructions here to make merging
     // easier when I do them one by one.
     // kExprI64Add:
+    case IrOpcode::kInt64Add: {
+      DCHECK(node->InputCount() == 2);
+
+      Node* right = node->InputAt(1);
+      node->ReplaceInput(1, GetReplacementLow(right));
+      node->AppendInput(zone(), GetReplacementHigh(right));
+
+      Node* left = node->InputAt(0);
+      node->ReplaceInput(0, GetReplacementLow(left));
+      node->InsertInput(zone(), 1, GetReplacementHigh(left));
+
+      NodeProperties::ChangeOp(node, machine()->Int32PairAdd());
+      // We access the additional return values through projections.
+      Node* low_node = graph()->NewNode(common()->Projection(0), node);
+      Node* high_node = graph()->NewNode(common()->Projection(1), node);
+      ReplaceNode(node, low_node, high_node);
+      break;
+    }
+
     // kExprI64Sub:
     // kExprI64Mul:
     // kExprI64DivS:
     // kExprI64DivU:
     // kExprI64RemS:
     // kExprI64RemU:
     // kExprI64Ior:
     case IrOpcode::kWord64Or: {
       DCHECK(node->InputCount() == 2);
       Node* left = node->InputAt(0);
@@ skipping 229 matching lines @@
 }
 
 Node* Int64Lowering::GetReplacementHigh(Node* node) {
   Node* result = replacements_[node->id()].high;
   DCHECK(result);
   return result;
 }
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8