Simplify the way constructors are called and avoid pushing...

src/arm/full-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 1682 matching lines @@
     EmitCallWithStub(expr);
   }
 }
 
 
 void FullCodeGenerator::VisitCallNew(CallNew* expr) {
   Comment cmnt(masm_, "[ CallNew");
   // According to ECMA-262, section 11.2.2, page 44, the function
   // expression in new calls must be evaluated before the
   // arguments.
-  // Push function on the stack.
+
+  // Push constructor on the stack.  If it's not a function it's used as
+  // receiver for CALL_NON_FUNCTION, otherwise the value on the stack is
+  // ignored.
   VisitForValue(expr->expression(), kStack);
 
-  // Push global object (receiver).
-  __ ldr(r0, CodeGenerator::GlobalObject());
-  __ push(r0);
   // Push the arguments ("left-to-right") on the stack.
   ZoneList<Expression*>* args = expr->arguments();
   int arg_count = args->length();
   for (int i = 0; i < arg_count; i++) {
     VisitForValue(args->at(i), kStack);
   }
 
   // Call the construct call builtin that handles allocation and
   // constructor invocation.
   SetSourcePosition(expr->position());
 
-  // Load function, arg_count into r1 and r0.
+  // Load function and argument count into r1 and r0.
   __ mov(r0, Operand(arg_count));
-  // Function is in sp[arg_count + 1].
-  __ ldr(r1, MemOperand(sp, (arg_count + 1) * kPointerSize));
+  __ ldr(r1, MemOperand(sp, arg_count * kPointerSize));
 
   Handle<Code> construct_builtin(Builtins::builtin(Builtins::JSConstructCall));
   __ Call(construct_builtin, RelocInfo::CONSTRUCT_CALL);
-
-  // Replace function on TOS with result in r0, or pop it.
-  DropAndApply(1, context_, r0);
+  Apply(context_, r0);
 }
 
 
 void FullCodeGenerator::EmitIsSmi(ZoneList<Expression*>* args) {
   ASSERT(args->length() == 1);
 
   VisitForValue(args->at(0), kAccumulator);
 
   Label materialize_true, materialize_false;
   Label* if_true = NULL;
@@ skipping 1414 matching lines @@
   __ mov(r1, Operand(r1, ASR, 1));  // Un-smi-tag value.
   __ add(pc, r1, Operand(masm_->CodeObject()));
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM