[turbofan] Int32Add/Sub/MulWithOverflow also zero extend to 64bit.

R=jarin@chromium.org

Review-Url: https://codereview.chromium.org/2338263004
Cr-Commit-Position: refs/heads/master@{#39437}

src/compiler/x64/instruction-selector-x64.cc

@@ -1193,11 +1193,10 @@ void InstructionSelector::VisitChangeInt32ToInt64(Node* node) {
   }
 }
 
+namespace {
 
-void InstructionSelector::VisitChangeUint32ToUint64(Node* node) {
-  X64OperandGenerator g(this);
-  Node* value = node->InputAt(0);
-  switch (value->opcode()) {
+bool ZeroExtendsWord32ToWord64(Node* node) {
+  switch (node->opcode()) {
     case IrOpcode::kWord32And:
     case IrOpcode::kWord32Or:
     case IrOpcode::kWord32Xor:
@@ -1218,14 +1217,36 @@ void InstructionSelector::VisitChangeUint32ToUint64(Node* node) {
     case IrOpcode::kUint32LessThan:
     case IrOpcode::kUint32LessThanOrEqual:
     case IrOpcode::kUint32Mod:
-    case IrOpcode::kUint32MulHigh: {
+    case IrOpcode::kUint32MulHigh:
       // These 32-bit operations implicitly zero-extend to 64-bit on x64, so the
       // zero-extension is a no-op.
-      Emit(kArchNop, g.DefineSameAsFirst(node), g.Use(value));
-      return;
+      return true;
+    case IrOpcode::kProjection: {
+      Node* const value = node->InputAt(0);
+      switch (value->opcode()) {
+        case IrOpcode::kInt32AddWithOverflow:
+        case IrOpcode::kInt32SubWithOverflow:
+        case IrOpcode::kInt32MulWithOverflow:
+          return true;
+        default:
+          return false;
+      }
     }
     default:
-      break;
+      return false;
+  }
+}
+
+}  // namespace
+
+void InstructionSelector::VisitChangeUint32ToUint64(Node* node) {
+  X64OperandGenerator g(this);
+  Node* value = node->InputAt(0);
+  if (ZeroExtendsWord32ToWord64(value)) {
+    // These 32-bit operations implicitly zero-extend to 64-bit on x64, so the
+    // zero-extension is a no-op.
+    Emit(kArchNop, g.DefineSameAsFirst(node), g.Use(value));
+    return;
   }
   Emit(kX64Movl, g.DefineAsRegister(node), g.Use(value));
 }