[interpreter] Reduce move operations for wide register support.

src/compiler/interpreter-assembler.cc

 // Copyright 2015 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/interpreter-assembler.h"
 
 #include <ostream>
 
 #include "src/code-factory.h"
 #include "src/compiler/graph.h"
@@ skipping 287 matching lines @@
           interpreter::Bytecodes::GetOperandType(bytecode_, operand_index));
       return BytecodeOperandShort(operand_index);
     case interpreter::OperandSize::kNone:
       UNREACHABLE();
   }
   return nullptr;
 }
 
 
 Node* InterpreterAssembler::BytecodeOperandReg(int operand_index) {
-  switch (interpreter::Bytecodes::GetOperandType(bytecode_, operand_index)) {
-    case interpreter::OperandType::kMaybeReg8:
-    case interpreter::OperandType::kReg8:
-    case interpreter::OperandType::kRegPair8:
-    case interpreter::OperandType::kRegTriple8:
-      DCHECK_EQ(
-          interpreter::OperandSize::kByte,
-          interpreter::Bytecodes::GetOperandSize(bytecode_, operand_index));
+  interpreter::OperandType operand_type =
+      interpreter::Bytecodes::GetOperandType(bytecode_, operand_index);
+  if (interpreter::Bytecodes::IsRegisterOperandType(operand_type)) {
+    interpreter::OperandSize operand_size =
+        interpreter::Bytecodes::SizeOfOperand(operand_type);
+    if (operand_size == interpreter::OperandSize::kByte) {
       return BytecodeOperandSignExtended(operand_index);
-    case interpreter::OperandType::kMaybeReg16:
-    case interpreter::OperandType::kReg16:
-    case interpreter::OperandType::kRegPair16:
-    case interpreter::OperandType::kRegTriple16:
-      DCHECK_EQ(
-          interpreter::OperandSize::kShort,
-          interpreter::Bytecodes::GetOperandSize(bytecode_, operand_index));
+    } else if (operand_size == interpreter::OperandSize::kShort) {
       return BytecodeOperandShortSignExtended(operand_index);
-    case interpreter::OperandType::kNone:
-    case interpreter::OperandType::kIdx8:
-    case interpreter::OperandType::kIdx16:
-    case interpreter::OperandType::kImm8:
-    case interpreter::OperandType::kRegCount8:
-    case interpreter::OperandType::kRegCount16:
-      UNREACHABLE();
+    }
   }
+  UNREACHABLE();
   return nullptr;
 }
 
 
 Node* InterpreterAssembler::Int32Constant(int value) {
   return raw_assembler_->Int32Constant(value);
 }
 
 
 Node* InterpreterAssembler::IntPtrConstant(intptr_t value) {
@@ skipping 412 matching lines @@
   return raw_assembler_->call_descriptor();
 }
 
 
 Zone* InterpreterAssembler::zone() { return raw_assembler_->zone(); }
 
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8