ARM: Optimisations for call, jump and untag....

src/arm/simulator-arm.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1264 matching lines @@
 }
 
 
 // Set the oVerflow flag.
 void Simulator::SetVFlag(bool val) {
   v_flag_ = val;
 }
 
 
 // Calculate C flag value for additions.
-bool Simulator::CarryFrom(int32_t left, int32_t right) {
+bool Simulator::CarryFrom(int32_t left, int32_t right, int32_t carry) {
   uint32_t uleft = static_cast<uint32_t>(left);
   uint32_t uright = static_cast<uint32_t>(right);
   uint32_t urest  = 0xffffffffU - uleft;
 
-  return (uright > urest);
+  return (uright > urest) ||
+         (carry && (((uright + 1) > urest) || (uright > (urest - 1))));
 }
 
 
 // Calculate C flag value for subtractions.
 bool Simulator::BorrowFrom(int32_t left, int32_t right) {
   uint32_t uleft = static_cast<uint32_t>(left);
   uint32_t uright = static_cast<uint32_t>(right);
 
   return (uright > uleft);
 }
@@ skipping 901 matching lines @@
         set_register(rd, alu_out);
         if (instr->HasS()) {
           SetNZFlags(alu_out);
           SetCFlag(CarryFrom(rn_val, shifter_operand));
           SetVFlag(OverflowFrom(alu_out, rn_val, shifter_operand, true));
         }
         break;
       }
 
       case ADC: {
-        Format(instr, "adc'cond's 'rd, 'rn, 'shift_rm");
-        Format(instr, "adc'cond's 'rd, 'rn, 'imm");
+        // Format(instr, "adc'cond's 'rd, 'rn, 'shift_rm");
+        // Format(instr, "adc'cond's 'rd, 'rn, 'imm");
+        alu_out = rn_val + shifter_operand + GetCarry();
+        set_register(rd, alu_out);
+        if (instr->HasS()) {
+          SetNZFlags(alu_out);
+          SetCFlag(CarryFrom(rn_val, shifter_operand, GetCarry()));
+          SetVFlag(OverflowFrom(alu_out, rn_val, shifter_operand, true));
+        }
         break;
       }
 
       case SBC: {
         Format(instr, "sbc'cond's 'rd, 'rn, 'shift_rm");
         Format(instr, "sbc'cond's 'rd, 'rn, 'imm");
         break;
       }
 
       case RSC: {
@@ skipping 1073 matching lines @@
   uintptr_t address = *stack_slot;
   set_register(sp, current_sp + sizeof(uintptr_t));
   return address;
 }
 
 } }  // namespace v8::internal
 
 #endif  // USE_SIMULATOR
 
 #endif  // V8_TARGET_ARCH_ARM