MIPS: [Atomics] Remove Atomics code stubs; use TF ops.

src/mips/constants-mips.h

 // Copyright 2012 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_MIPS_CONSTANTS_H_
 #define  V8_MIPS_CONSTANTS_H_
 #include "src/globals.h"
 // UNIMPLEMENTED_ macro for MIPS.
 #ifdef DEBUG
 #define UNIMPLEMENTED_MIPS()                                                  \
@@ skipping 391 matching lines @@
   SLLV = ((0U << 3) + 4),
   LSA = ((0U << 3) + 5),
   SRLV = ((0U << 3) + 6),
   SRAV = ((0U << 3) + 7),
 
   JR = ((1U << 3) + 0),
   JALR = ((1U << 3) + 1),
   MOVZ = ((1U << 3) + 2),
   MOVN = ((1U << 3) + 3),
   BREAK = ((1U << 3) + 5),
+  SYNC = ((1U << 3) + 7),
 
   MFHI = ((2U << 3) + 0),
   CLZ_R6 = ((2U << 3) + 0),
   CLO_R6 = ((2U << 3) + 1),
   MFLO = ((2U << 3) + 2),
 
   MULT = ((3U << 3) + 0),
   MULTU = ((3U << 3) + 1),
   DIV = ((3U << 3) + 2),
   DIVU = ((3U << 3) + 3),
@@ skipping 191 matching lines @@
 
   // POP66 Encoding of rs Field.
   JIC = ((0U << 5) + 0),
 
   // POP76 Encoding of rs Field.
   JIALC = ((0U << 5) + 0),
 
   NULLSF = 0U
 };
 
-
 // ----- Emulated conditions.
 // On MIPS we use this enum to abstract from conditional branch instructions.
 // The 'U' prefix is used to specify unsigned comparisons.
 // Opposite conditions must be paired as odd/even numbers
 // because 'NegateCondition' function flips LSB to negate condition.
 enum Condition {
   // Any value < 0 is considered no_condition.
   kNoCondition = -1,
   overflow = 0,
   no_overflow = 1,
@@ skipping 287 matching lines @@
       FunctionFieldToBitNumber(ADD) | FunctionFieldToBitNumber(ADDU) |
       FunctionFieldToBitNumber(SUB) | FunctionFieldToBitNumber(SUBU) |
       FunctionFieldToBitNumber(AND) | FunctionFieldToBitNumber(OR) |
       FunctionFieldToBitNumber(XOR) | FunctionFieldToBitNumber(NOR) |
       FunctionFieldToBitNumber(SLT) | FunctionFieldToBitNumber(SLTU) |
       FunctionFieldToBitNumber(TGE) | FunctionFieldToBitNumber(TGEU) |
       FunctionFieldToBitNumber(TLT) | FunctionFieldToBitNumber(TLTU) |
       FunctionFieldToBitNumber(TEQ) | FunctionFieldToBitNumber(TNE) |
       FunctionFieldToBitNumber(MOVZ) | FunctionFieldToBitNumber(MOVN) |
       FunctionFieldToBitNumber(MOVCI) | FunctionFieldToBitNumber(SELEQZ_S) |
-      FunctionFieldToBitNumber(SELNEZ_S);
-
+      FunctionFieldToBitNumber(SELNEZ_S) | FunctionFieldToBitNumber(SYNC);
 
   // Get the encoding type of the instruction.
   inline Type InstructionType(TypeChecks checks = NORMAL) const;
 
   // Accessors for the different named fields used in the MIPS encoding.
   inline Opcode OpcodeValue() const {
     return static_cast<Opcode>(
         Bits(kOpcodeShift + kOpcodeBits - 1, kOpcodeShift));
   }
 
@@ skipping 275 matching lines @@
       }
   }
 }
 
 #undef OpcodeToBitNumber
 #undef FunctionFieldToBitNumber
 }  // namespace internal
 }  // namespace v8
 
 #endif    // #ifndef V8_MIPS_CONSTANTS_H_