[turbofan] Add support for accessing Uint8ClampedArrays.

src/compiler/typed-optimization.cc

 // Copyright 2016 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/typed-optimization.h"
 
 #include "src/compilation-dependencies.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/node-properties.h"
 #include "src/compiler/simplified-operator.h"
@@ skipping 69 matching lines @@
       return ReduceCheckMaps(node);
     case IrOpcode::kCheckString:
       return ReduceCheckString(node);
     case IrOpcode::kLoadField:
       return ReduceLoadField(node);
     case IrOpcode::kNumberCeil:
     case IrOpcode::kNumberFloor:
     case IrOpcode::kNumberRound:
     case IrOpcode::kNumberTrunc:
       return ReduceNumberRoundop(node);
+    case IrOpcode::kNumberToUint8Clamped:
+      return ReduceNumberToUint8Clamped(node);
     case IrOpcode::kPhi:
       return ReducePhi(node);
     case IrOpcode::kSelect:
       return ReduceSelect(node);
     default:
       break;
   }
   return NoChange();
 }
 
@@ skipping 85 matching lines @@
 
 Reduction TypedOptimization::ReduceNumberRoundop(Node* node) {
   Node* const input = NodeProperties::GetValueInput(node, 0);
   Type* const input_type = NodeProperties::GetType(input);
   if (input_type->Is(type_cache_.kIntegerOrMinusZeroOrNaN)) {
     return Replace(input);
   }
   return NoChange();
 }
 
+Reduction TypedOptimization::ReduceNumberToUint8Clamped(Node* node) {
+  Node* const input = NodeProperties::GetValueInput(node, 0);
+  Type* const input_type = NodeProperties::GetType(input);
+  if (input_type->Is(type_cache_.kUint8)) {
+    return Replace(input);
+  }
+  return NoChange();
+}
+
 Reduction TypedOptimization::ReducePhi(Node* node) {
   // Try to narrow the type of the Phi {node}, which might be more precise now
   // after lowering based on types, i.e. a SpeculativeNumberAdd has a more
   // precise type than the JSAdd that was in the graph when the Typer was run.
   DCHECK_EQ(IrOpcode::kPhi, node->opcode());
   int arity = node->op()->ValueInputCount();
   Type* type = NodeProperties::GetType(node->InputAt(0));
   for (int i = 1; i < arity; ++i) {
     type = Type::Union(type, NodeProperties::GetType(node->InputAt(i)),
                        graph()->zone());
@@ skipping 51 matching lines @@
 
 Isolate* TypedOptimization::isolate() const { return jsgraph()->isolate(); }
 
 SimplifiedOperatorBuilder* TypedOptimization::simplified() const {
   return jsgraph()->simplified();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8