[turbofan] Introduce TruncateTaggedToWord32 simplified operator.

test/cctest/compiler/test-representation-change.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 <limits>
 
 #include "test/cctest/cctest.h"
 #include "test/cctest/compiler/codegen-tester.h"
 #include "test/cctest/compiler/graph-builder-tester.h"
 #include "test/cctest/compiler/value-helper.h"
@@ skipping 515 matching lines @@
   RepresentationChangerTester r;
 
   CheckChange(IrOpcode::kChangeTaggedToInt32, MachineRepresentation::kTagged,
               Type::Signed32(), MachineRepresentation::kWord32);
   CheckChange(IrOpcode::kChangeTaggedToUint32, MachineRepresentation::kTagged,
               Type::Unsigned32(), MachineRepresentation::kWord32);
   CheckChange(IrOpcode::kChangeInt32ToFloat64, MachineRepresentation::kWord32,
               Type::None(), MachineRepresentation::kFloat64);
   CheckChange(IrOpcode::kChangeFloat64ToInt32, MachineRepresentation::kFloat64,
               Type::Signed32(), MachineRepresentation::kWord32);
-  CheckChange(IrOpcode::kTruncateFloat64ToInt32,
+  CheckChange(IrOpcode::kTruncateFloat64ToWord32,
               MachineRepresentation::kFloat64, Type::Number(),
               MachineRepresentation::kWord32);
 
   CheckTwoChanges(IrOpcode::kChangeInt32ToFloat64,
                   IrOpcode::kTruncateFloat64ToFloat32,
                   MachineRepresentation::kWord32, Type::None(),
                   MachineRepresentation::kFloat32);
   CheckTwoChanges(IrOpcode::kChangeFloat32ToFloat64,
-                  IrOpcode::kTruncateFloat64ToInt32,
+                  IrOpcode::kTruncateFloat64ToWord32,
                   MachineRepresentation::kFloat32, Type::Number(),
                   MachineRepresentation::kWord32);
 }
 
 
 TEST(Nops) {
   RepresentationChangerTester r;
 
   // X -> X is always a nop for any single representation X.
   for (size_t i = 0; i < arraysize(kMachineTypes); i++) {
@@ skipping 85 matching lines @@
                    MachineRepresentation::kWord64);
   r.CheckTypeError(MachineRepresentation::kWord32, Type::Signed32(),
                    MachineRepresentation::kWord64);
   r.CheckTypeError(MachineRepresentation::kWord32, Type::Unsigned32(),
                    MachineRepresentation::kWord64);
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8