Experimental: begin using the register allocator for switch statements...

src/virtual-frame-ia32.cc

 // Copyright 2008 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 709 matching lines @@
 
   if (element.is_memory()) {
     ASSERT(index <= stack_pointer_);
     // Eagerly load memory elements into a register.  The element at
     // the index and the new top of the frame are backed by the same
     // register location.
     Result temp = cgen_->allocator()->Allocate();
     ASSERT(temp.is_valid());
     FrameElement new_element
         = FrameElement::RegisterElement(temp.reg(),
-                                        FrameElement::NOT_SYNCED);
+                                        FrameElement::SYNCED);
     Use(temp.reg());
     elements_[index] = new_element;
+    __ mov(temp.reg(), Operand(ebp, fp_relative(index)));
+
     Use(temp.reg());
+    new_element.clear_sync();
     elements_.Add(new_element);
-
-    // Finally, move the element at the index into its new location.
-    elements_[index].set_sync();
-    __ mov(temp.reg(), Operand(ebp, fp_relative(index)));
   } else {
     // For constants and registers, add an (unsynced) copy of the element to
     // the top of the frame.
     ASSERT(element.is_register() || element.is_constant());
     if (element.is_register()) {
       Use(element.reg());
     }
     element.clear_sync();
     elements_.Add(element);
   }
@@ skipping 142 matching lines @@
   // Discard elements from the virtual frame and free any registers.
   for (int i = 0; i < count; i++) {
     FrameElement dropped = elements_.RemoveLast();
     if (dropped.is_register()) {
       Unuse(dropped.reg());
     }
   }
 }
 
 
-void VirtualFrame::Drop() { Drop(1); }
-
-
 Result VirtualFrame::Pop() {
   FrameElement popped = elements_.RemoveLast();
   bool pop_needed = (stack_pointer_ == elements_.length());
 
   if (popped.is_constant()) {
     if (pop_needed) {
       stack_pointer_--;
       __ add(Operand(esp), Immediate(kPointerSize));
     }
     return Result(popped.handle(), cgen_);
@@ skipping 87 matching lines @@
       return false;
     }
   }
   return true;
 }
 #endif
 
 #undef __
 
 } }  // namespace v8::internal