Merge experimental/gc branch to the bleeding_edge.

src/lithium-allocator.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 1025 matching lines @@
                          phi_operand);
 
       // We are going to insert a move before the branch instruction.
       // Some branch instructions (e.g. loops' back edges)
       // can potentially cause a GC so they have a pointer map.
       // By inserting a move we essentially create a copy of a
       // value which is invisible to PopulatePointerMaps(), because we store
       // it into a location different from the operand of a live range
       // covering a branch instruction.
       // Thus we need to manually record a pointer.
-      if (phi->representation().IsTagged()) {
-        LInstruction* branch =
-            InstructionAt(cur_block->last_instruction_index());
-        if (branch->HasPointerMap()) {
+      LInstruction* branch =
+          InstructionAt(cur_block->last_instruction_index());
+      if (branch->HasPointerMap()) {
+        if (phi->representation().IsTagged()) {
           branch->pointer_map()->RecordPointer(phi_operand);
+        } else if (!phi->representation().IsDouble()) {
+          branch->pointer_map()->RecordUntagged(phi_operand);
         }
       }
     }
 
     LiveRange* live_range = LiveRangeFor(phi->id());
     LLabel* label = chunk_->GetLabel(phi->block()->block_id());
     label->GetOrCreateParallelMove(LGap::START)->
         AddMove(phi_operand, live_range->GetSpillOperand());
     live_range->SetSpillStartIndex(phi->block()->first_instruction_index());
   }
@@ skipping 74 matching lines @@
         gap = GetLastGap(pred);
 
         // We are going to insert a move before the branch instruction.
         // Some branch instructions (e.g. loops' back edges)
         // can potentially cause a GC so they have a pointer map.
         // By inserting a move we essentially create a copy of a
         // value which is invisible to PopulatePointerMaps(), because we store
         // it into a location different from the operand of a live range
         // covering a branch instruction.
         // Thus we need to manually record a pointer.
-        if (HasTaggedValue(range->id())) {
-          LInstruction* branch = InstructionAt(pred->last_instruction_index());
-          if (branch->HasPointerMap()) {
+        LInstruction* branch = InstructionAt(pred->last_instruction_index());
+        if (branch->HasPointerMap()) {
+          if (HasTaggedValue(range->id())) {
             branch->pointer_map()->RecordPointer(cur_op);
+          } else if (!cur_op->IsDoubleStackSlot() &&
+                     !cur_op->IsDoubleRegister()) {
+            branch->pointer_map()->RemovePointer(cur_op);
           }
         }
       }
       gap->GetOrCreateParallelMove(LGap::START)->AddMove(pred_op, cur_op);
     }
   }
 }
 
 
 LParallelMove* LAllocator::GetConnectingParallelMove(LifetimePosition pos) {
@@ skipping 960 matching lines @@
     LiveRange* current = live_ranges()->at(i);
     if (current != NULL) current->Verify();
   }
 }
 
 
 #endif
 
 
 } }  // namespace v8::internal