[turbofan] Introduce TruncateTaggedToBit operator for ToBoolean truncation.

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 633 matching lines @@
   r.CheckNop(MachineRepresentation::kBit, Type::Boolean(),
              MachineRepresentation::kWord32);
   r.CheckNop(MachineRepresentation::kBit, Type::Boolean(),
              MachineRepresentation::kWord64);
 }
 
 
 TEST(TypeErrors) {
   RepresentationChangerTester r;
 
-  // Wordish cannot be implicitly converted to/from comparison conditions.
-  r.CheckTypeError(MachineRepresentation::kWord8, Type::Number(),
-                   MachineRepresentation::kBit);
-  r.CheckTypeError(MachineRepresentation::kWord16, Type::Number(),
-                   MachineRepresentation::kBit);
-  r.CheckTypeError(MachineRepresentation::kWord32, Type::Number(),
-                   MachineRepresentation::kBit);
-  r.CheckTypeError(MachineRepresentation::kWord64, Type::Number(),
-                   MachineRepresentation::kBit);
-
   // Floats cannot be implicitly converted to/from comparison conditions.
-  r.CheckTypeError(MachineRepresentation::kFloat64, Type::Number(),
-                   MachineRepresentation::kBit);
-
-  // Floats cannot be implicitly converted to/from comparison conditions.
-  r.CheckTypeError(MachineRepresentation::kFloat32, Type::Number(),
-                   MachineRepresentation::kBit);
   r.CheckTypeError(MachineRepresentation::kBit, Type::Number(),
                    MachineRepresentation::kFloat32);
   r.CheckTypeError(MachineRepresentation::kBit, Type::Boolean(),
                    MachineRepresentation::kFloat32);
 
   // Word64 is internal and shouldn't be implicitly converted.
   r.CheckTypeError(MachineRepresentation::kWord64, Type::Internal(),
                    MachineRepresentation::kTagged);
   r.CheckTypeError(MachineRepresentation::kTagged, Type::Number(),
                    MachineRepresentation::kWord64);
   r.CheckTypeError(MachineRepresentation::kTagged, Type::Boolean(),
                    MachineRepresentation::kWord64);
 
   // Word64 / Word32 shouldn't be implicitly converted.
   r.CheckTypeError(MachineRepresentation::kWord64, Type::Internal(),
                    MachineRepresentation::kWord32);
   r.CheckTypeError(MachineRepresentation::kWord32, Type::Number(),
                    MachineRepresentation::kWord64);
   r.CheckTypeError(MachineRepresentation::kWord32, Type::Signed32(),
                    MachineRepresentation::kWord64);
   r.CheckTypeError(MachineRepresentation::kWord32, Type::Unsigned32(),
                    MachineRepresentation::kWord64);
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8