S390: Fixed s390 simulation check for underflow in subtraction.

src/s390/simulator-s390.h

 // 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.
 
 // Declares a Simulator for S390 instructions if we are not generating a native
 // S390 binary. This Simulator allows us to run and debug S390 code generation
 // on regular desktop machines.
 // V8 calls into generated code by "calling" the CALL_GENERATED_CODE macro,
 // which will start execution in the Simulator or forwards to the real entry
 // on a S390 hardware platform.
@@ skipping 240 matching lines @@
     // C code.
     end_sim_pc = -2
   };
 
   // Unsupported instructions use Format to print an error and stop execution.
   void Format(Instruction* instr, const char* format);
 
   // Helper functions to set the conditional flags in the architecture state.
   bool CarryFrom(int32_t left, int32_t right, int32_t carry = 0);
   bool BorrowFrom(int32_t left, int32_t right);
-  bool OverflowFrom(int32_t alu_out, int32_t left, int32_t right,
-                    bool addition);
+  template <typename T1>
+  inline bool OverflowFromSigned(T1 alu_out, T1 left, T1 right, bool addition);
 
   // Helper functions to decode common "addressing" modes
   int32_t GetShiftRm(Instruction* instr, bool* carry_out);
   int32_t GetImm(Instruction* instr, bool* carry_out);
   void ProcessPUW(Instruction* instr, int num_regs, int operand_size,
                   intptr_t* start_address, intptr_t* end_address);
   void HandleRList(Instruction* instr, bool load);
   void HandleVList(Instruction* inst);
   void SoftwareInterrupt(Instruction* instr);
 
@@ skipping 252 matching lines @@
   static inline void UnregisterCTryCatch(v8::internal::Isolate* isolate) {
     Simulator::current(isolate)->PopAddress();
   }
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // !defined(USE_SIMULATOR)
 #endif  // V8_S390_SIMULATOR_S390_H_