Improve count operation in top-level compiler on ARM....

src/arm/fast-codegen-arm.cc

 // Copyright 2009 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 1492 matching lines @@
             break;
           case KEYED_PROPERTY:
             __ str(r0, MemOperand(sp, 2 * kPointerSize));
             break;
         }
         break;
     }
   }
 
   // Call runtime for +1/-1.
-  __ push(r0);
-  __ mov(ip, Operand(Smi::FromInt(1)));
-  __ push(ip);
   if (expr->op() == Token::INC) {
-    __ CallRuntime(Runtime::kNumberAdd, 2);
+    __ mov(ip, Operand(Smi::FromInt(1)));
   } else {
-    __ CallRuntime(Runtime::kNumberSub, 2);
+    __ mov(ip, Operand(Smi::FromInt(-1)));
   }
+  __ stm(db_w, sp, ip.bit() | r0.bit());
+  __ CallRuntime(Runtime::kNumberAdd, 2);
 
   // Store the value returned in r0.
   switch (assign_type) {
     case VARIABLE:
       __ push(r0);
       if (expr->is_postfix()) {
         EmitVariableAssignment(expr->expression()->AsVariableProxy()->var(),
                                Expression::kEffect);
         // For all contexts except kEffect: We have the result on
         // top of the stack.
@@ skipping 292 matching lines @@
   __ pop(result_register());
   ASSERT_EQ(1, kSmiTagSize + kSmiShiftSize);
   __ mov(r1, Operand(r1, ASR, 1));  // Un-smi-tag value.
   __ add(pc, r1, Operand(masm_->CodeObject()));
 }
 
 
 #undef __
 
 } }  // namespace v8::internal