[turbofan] Add support for change/truncate to MachineOperatorReducer.

src/compiler/machine-operator-reducer.cc

Index: src/compiler/machine-operator-reducer.cc
diff --git a/src/compiler/machine-operator-reducer.cc b/src/compiler/machine-operator-reducer.cc
index 8466cbbf47537f22b8b750fb5ea8dd38b41962d8..07bb02f9da1973989f429eae471e0f9b71f2f779 100644
--- a/src/compiler/machine-operator-reducer.cc
+++ b/src/compiler/machine-operator-reducer.cc
@@ -29,24 +29,29 @@ MachineOperatorReducer::MachineOperatorReducer(Graph* graph,
       machine_(graph->zone()) {}
 
 
-Node* MachineOperatorReducer::Int32Constant(int32_t value) {
-  Node** loc = cache_->FindInt32Constant(value);
+Node* MachineOperatorReducer::Float64Constant(volatile double value) {
+  Node** loc = cache_->FindFloat64Constant(value);
   if (*loc == NULL) {
-    *loc = graph_->NewNode(common_.Int32Constant(value));
+    *loc = graph_->NewNode(common_.Float64Constant(value));
   }
   return *loc;
 }
 
 
-Node* MachineOperatorReducer::Float64Constant(volatile double value) {
-  Node** loc = cache_->FindFloat64Constant(value);
+Node* MachineOperatorReducer::Int32Constant(int32_t value) {
+  Node** loc = cache_->FindInt32Constant(value);
   if (*loc == NULL) {
-    *loc = graph_->NewNode(common_.Float64Constant(value));
+    *loc = graph_->NewNode(common_.Int32Constant(value));
   }
   return *loc;
 }
 
 
+Node* MachineOperatorReducer::Int64Constant(int64_t value) {
+  return graph_->NewNode(common_.Int64Constant(value));
+}
+
+
 // Perform constant folding and strength reduction on machine operators.
 Reduction MachineOperatorReducer::Reduce(Node* node) {
   switch (node->opcode()) {
@@ -392,6 +397,50 @@ Reduction MachineOperatorReducer::Reduce(Node* node) {
       }
       break;
     }
+    case IrOpcode::kChangeFloat64ToInt32: {
+      Float64Matcher m(node->InputAt(0));
+      if (m.HasValue()) return ReplaceInt32(FastD2I(m.Value()));
+      if (m.IsChangeInt32ToFloat64()) return Replace(m.node()->InputAt(0));
+      break;
+    }
+    case IrOpcode::kChangeFloat64ToUint32: {
+      Float64Matcher m(node->InputAt(0));
+      if (m.HasValue()) return ReplaceInt32(FastD2UI(m.Value()));
+      if (m.IsChangeUint32ToFloat64()) return Replace(m.node()->InputAt(0));
+      break;
+    }
+    case IrOpcode::kChangeInt32ToFloat64: {
+      Int32Matcher m(node->InputAt(0));
+      if (m.HasValue()) return ReplaceFloat64(FastI2D(m.Value()));
+      break;
+    }
+    case IrOpcode::kChangeInt32ToInt64: {
+      Int32Matcher m(node->InputAt(0));
+      if (m.HasValue()) return ReplaceInt64(m.Value());
+      break;
+    }
+    case IrOpcode::kChangeUint32ToFloat64: {
+      Uint32Matcher m(node->InputAt(0));
+      if (m.HasValue()) return ReplaceFloat64(FastUI2D(m.Value()));
+      break;
+    }
+    case IrOpcode::kChangeUint32ToUint64: {
+      Uint32Matcher m(node->InputAt(0));
+      if (m.HasValue()) return ReplaceInt64(static_cast<uint64_t>(m.Value()));
+      break;
+    }
+    case IrOpcode::kTruncateFloat64ToInt32: {
+      Float64Matcher m(node->InputAt(0));
+      if (m.HasValue()) return ReplaceInt32(DoubleToInt32(m.Value()));
+      if (m.IsChangeInt32ToFloat64()) return Replace(m.node()->InputAt(0));
+      break;
+    }
+    case IrOpcode::kTruncateInt64ToInt32: {
+      Int64Matcher m(node->InputAt(0));
+      if (m.HasValue()) return ReplaceInt32(static_cast<int32_t>(m.Value()));
+      if (m.IsChangeInt32ToInt64()) return Replace(m.node()->InputAt(0));
+      break;
+    }
     // TODO(turbofan): strength-reduce and fold floating point operations.
     default:
       break;