[Interpreter] Remove all Ldr style bytecodes and replace with Star lookahead.

src/interpreter/bytecodes.h

 // 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.
 
 #ifndef V8_INTERPRETER_BYTECODES_H_
 #define V8_INTERPRETER_BYTECODES_H_
 
 #include <cstdint>
 #include <iosfwd>
 #include <string>
@@ skipping 19 matching lines @@
   /* Loading the accumulator */                                                \
   V(LdaZero, AccumulatorUse::kWrite)                                           \
   V(LdaSmi, AccumulatorUse::kWrite, OperandType::kImm)                         \
   V(LdaUndefined, AccumulatorUse::kWrite)                                      \
   V(LdaNull, AccumulatorUse::kWrite)                                           \
   V(LdaTheHole, AccumulatorUse::kWrite)                                        \
   V(LdaTrue, AccumulatorUse::kWrite)                                           \
   V(LdaFalse, AccumulatorUse::kWrite)                                          \
   V(LdaConstant, AccumulatorUse::kWrite, OperandType::kIdx)                    \
                                                                                \
-  /* Loading registers */                                                      \
-  V(LdrUndefined, AccumulatorUse::kNone, OperandType::kRegOut)                 \
-                                                                               \
   /* Globals */                                                                \
   V(LdaGlobal, AccumulatorUse::kWrite, OperandType::kIdx)                      \
-  V(LdrGlobal, AccumulatorUse::kNone, OperandType::kIdx, OperandType::kRegOut) \
   V(LdaGlobalInsideTypeof, AccumulatorUse::kWrite, OperandType::kIdx)          \
   V(StaGlobalSloppy, AccumulatorUse::kRead, OperandType::kIdx,                 \
     OperandType::kIdx)                                                         \
   V(StaGlobalStrict, AccumulatorUse::kRead, OperandType::kIdx,                 \
     OperandType::kIdx)                                                         \
                                                                                \
   /* Context operations */                                                     \
   V(PushContext, AccumulatorUse::kRead, OperandType::kRegOut)                  \
   V(PopContext, AccumulatorUse::kNone, OperandType::kReg)                      \
   V(LdaContextSlot, AccumulatorUse::kWrite, OperandType::kReg,                 \
     OperandType::kIdx, OperandType::kUImm)                                     \
   V(LdaCurrentContextSlot, AccumulatorUse::kWrite, OperandType::kIdx)          \
-  V(LdrContextSlot, AccumulatorUse::kNone, OperandType::kReg,                  \
-    OperandType::kIdx, OperandType::kUImm, OperandType::kRegOut)               \
-  V(LdrCurrentContextSlot, AccumulatorUse::kNone, OperandType::kIdx,           \
-    OperandType::kRegOut)                                                      \
   V(StaContextSlot, AccumulatorUse::kRead, OperandType::kReg,                  \
     OperandType::kIdx, OperandType::kUImm)                                     \
   V(StaCurrentContextSlot, AccumulatorUse::kRead, OperandType::kIdx)           \
                                                                                \
   /* Load-Store lookup slots */                                                \
   V(LdaLookupSlot, AccumulatorUse::kWrite, OperandType::kIdx)                  \
   V(LdaLookupContextSlot, AccumulatorUse::kWrite, OperandType::kIdx,           \
     OperandType::kIdx, OperandType::kUImm)                                     \
   V(LdaLookupGlobalSlot, AccumulatorUse::kWrite, OperandType::kIdx,            \
     OperandType::kIdx, OperandType::kUImm)                                     \
@@ skipping 351 matching lines @@
   }
 
   // Return true if |bytecode| is an accumulator load without effects,
   // e.g. LdaConstant, LdaTrue, Ldar.
   static CONSTEXPR bool IsAccumulatorLoadWithoutEffects(Bytecode bytecode) {
     return bytecode == Bytecode::kLdar || bytecode == Bytecode::kLdaZero ||
            bytecode == Bytecode::kLdaSmi || bytecode == Bytecode::kLdaNull ||
            bytecode == Bytecode::kLdaTrue || bytecode == Bytecode::kLdaFalse ||
            bytecode == Bytecode::kLdaUndefined ||
            bytecode == Bytecode::kLdaTheHole ||
-           bytecode == Bytecode::kLdaConstant;
+           bytecode == Bytecode::kLdaConstant ||
+           bytecode == Bytecode::kLdaContextSlot ||
+           bytecode == Bytecode::kLdaCurrentContextSlot;
   }
 
   // Return true if |bytecode| is a register load without effects,
-  // e.g. Mov, Star, LdrUndefined.
+  // e.g. Mov, Star.
   static CONSTEXPR bool IsRegisterLoadWithoutEffects(Bytecode bytecode) {
     return bytecode == Bytecode::kMov || bytecode == Bytecode::kPopContext ||
-           bytecode == Bytecode::kPushContext || bytecode == Bytecode::kStar ||
-           bytecode == Bytecode::kLdrUndefined;
+           bytecode == Bytecode::kPushContext || bytecode == Bytecode::kStar;
   }
 
   // Returns true if the bytecode is a conditional jump taking
   // an immediate byte operand (OperandType::kImm).
   static CONSTEXPR bool IsConditionalJumpImmediate(Bytecode bytecode) {
     return bytecode == Bytecode::kJumpIfTrue ||
            bytecode == Bytecode::kJumpIfFalse ||
            bytecode == Bytecode::kJumpIfToBooleanTrue ||
            bytecode == Bytecode::kJumpIfToBooleanFalse ||
            bytecode == Bytecode::kJumpIfNotHole ||
@@ skipping 290 matching lines @@
 #undef CONSTEXPR
 
 V8_EXPORT_PRIVATE std::ostream& operator<<(std::ostream& os,
                                            const Bytecode& bytecode);
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_INTERPRETER_BYTECODES_H_