[arm][arm64] Improve CountTrailingZero implementation.

src/compiler/machine-operator.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 "src/compiler/machine-operator.h"
 
 #include "src/base/lazy-instance.h"
 #include "src/compiler/opcodes.h"
 #include "src/compiler/operator.h"
 
@@ skipping 181 matching lines @@
   V(Float64ExtractLowWord32, Operator::kNoProperties, 1, 0, 1)                \
   V(Float64ExtractHighWord32, Operator::kNoProperties, 1, 0, 1)               \
   V(Float64InsertLowWord32, Operator::kNoProperties, 2, 0, 1)                 \
   V(Float64InsertHighWord32, Operator::kNoProperties, 2, 0, 1)                \
   V(LoadStackPointer, Operator::kNoProperties, 0, 0, 1)                       \
   V(LoadFramePointer, Operator::kNoProperties, 0, 0, 1)
 
 #define PURE_OPTIONAL_OP_LIST(V)                            \
   V(Word32Ctz, Operator::kNoProperties, 1, 0, 1)            \
   V(Word64Ctz, Operator::kNoProperties, 1, 0, 1)            \
+  V(Word32ReverseBits, Operator::kNoProperties, 1, 0, 1)    \
+  V(Word64ReverseBits, Operator::kNoProperties, 1, 0, 1)    \
   V(Word32Popcnt, Operator::kNoProperties, 1, 0, 1)         \
   V(Word64Popcnt, Operator::kNoProperties, 1, 0, 1)         \
   V(Float32Max, Operator::kNoProperties, 2, 0, 1)           \
   V(Float32Min, Operator::kNoProperties, 2, 0, 1)           \
   V(Float64Max, Operator::kNoProperties, 2, 0, 1)           \
   V(Float64Min, Operator::kNoProperties, 2, 0, 1)           \
   V(Float32RoundDown, Operator::kNoProperties, 1, 0, 1)     \
   V(Float64RoundDown, Operator::kNoProperties, 1, 0, 1)     \
   V(Float32RoundUp, Operator::kNoProperties, 1, 0, 1)       \
   V(Float64RoundUp, Operator::kNoProperties, 1, 0, 1)       \
   V(Float32RoundTruncate, Operator::kNoProperties, 1, 0, 1) \
   V(Float64RoundTruncate, Operator::kNoProperties, 1, 0, 1) \
   V(Float64RoundTiesAway, Operator::kNoProperties, 1, 0, 1) \
   V(Float32RoundTiesEven, Operator::kNoProperties, 1, 0, 1) \
   V(Float64RoundTiesEven, Operator::kNoProperties, 1, 0, 1)
 
-
 #define MACHINE_TYPE_LIST(V) \
   V(Float32)                 \
   V(Float64)                 \
   V(Int8)                    \
   V(Uint8)                   \
   V(Int16)                   \
   V(Uint16)                  \
   V(Int32)                   \
   V(Uint32)                  \
   V(Int64)                   \
@@ skipping 232 matching lines @@
     case MachineRepresentation::kNone:
       break;
   }
   UNREACHABLE();
   return nullptr;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8