Change LoadIC interface on ia32 to take arguments in registers.

src/ia32/virtual-frame-ia32.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 870 matching lines @@
   ASSERT(cgen()->HasValidEntryRegisters());
   __ call(code, rmode);
   Result result = cgen()->allocator()->Allocate(eax);
   ASSERT(result.is_valid());
   return result;
 }
 
 
 Result VirtualFrame::CallLoadIC(RelocInfo::Mode mode) {
   // Name and receiver are on the top of the frame.  The IC expects
-  // name in ecx and receiver on the stack.  It does not drop the
-  // receiver.
+  // name in ecx and receiver in eax.
   Handle<Code> ic(Builtins::builtin(Builtins::LoadIC_Initialize));
   Result name = Pop();
-  PrepareForCall(1, 0);  // One stack arg, not callee-dropped.
-  name.ToRegister(ecx);
+  Result receiver = Pop();
+  PrepareForCall(0, 0);  // No stack arguments.
+  // Move results to the right registers:
+  if (name.is_register() && name.reg().is(eax)) {
+    if (receiver.is_register() && receiver.reg().is(ecx)) {
+      // Wrong registers.
+      __ xchg(eax, ecx);
+    } else {
+      // Register ecx is free for name, which frees eax for receiver.
+      name.ToRegister(ecx);
+      receiver.ToRegister(eax);
+    }
+  } else {
+    // Register eax is free for receiver, which frees ecx for name.
+    receiver.ToRegister(eax);
+    name.ToRegister(ecx);
+  }
   name.Unuse();
+  receiver.Unuse();
   return RawCallCodeObject(ic, mode);
 }
 
 
 Result VirtualFrame::CallKeyedLoadIC(RelocInfo::Mode mode) {
   // Key and receiver are on top of the frame.  The IC expects them on
   // the stack.  It does not drop them.
   Handle<Code> ic(Builtins::builtin(Builtins::KeyedLoadIC_Initialize));
   PrepareForCall(2, 0);  // Two stack args, neither callee-dropped.
   return RawCallCodeObject(ic, mode);
@@ skipping 213 matching lines @@
   ASSERT(stack_pointer_ == element_count() - 1);
   elements_.Add(FrameElement::MemoryElement());
   stack_pointer_++;
   __ push(immediate);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal