Improvements for x87 stack handling

src/lithium-allocator.cc

 // Copyright 2012 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 1770 matching lines @@
 
 // TryAllocateFreeReg and AllocateBlockedReg assume this
 // when allocating local arrays.
 STATIC_ASSERT(DoubleRegister::kMaxNumAllocatableRegisters >=
               Register::kMaxNumAllocatableRegisters);
 
 
 bool LAllocator::TryAllocateFreeReg(LiveRange* current) {
   LifetimePosition free_until_pos[DoubleRegister::kMaxNumAllocatableRegisters];
 
-  for (int i = 0; i < DoubleRegister::kMaxNumAllocatableRegisters; i++) {
+  for (int i = 0; i < num_registers_; i++) {
     free_until_pos[i] = LifetimePosition::MaxPosition();
   }
 
   for (int i = 0; i < active_live_ranges_.length(); ++i) {
     LiveRange* cur_active = active_live_ranges_.at(i);
     free_until_pos[cur_active->assigned_register()] =
         LifetimePosition::FromInstructionIndex(0);
   }
 
   for (int i = 0; i < inactive_live_ranges_.length(); ++i) {
@@ skipping 71 matching lines @@
     // There is no use in the current live range that requires a register.
     // We can just spill it.
     Spill(current);
     return;
   }
 
 
   LifetimePosition use_pos[DoubleRegister::kMaxNumAllocatableRegisters];
   LifetimePosition block_pos[DoubleRegister::kMaxNumAllocatableRegisters];
 
-  for (int i = 0; i < DoubleRegister::NumAllocatableRegisters(); i++) {
+  for (int i = 0; i < num_registers_; i++) {
     use_pos[i] = block_pos[i] = LifetimePosition::MaxPosition();
   }
 
   for (int i = 0; i < active_live_ranges_.length(); ++i) {
     LiveRange* range = active_live_ranges_[i];
     int cur_reg = range->assigned_register();
     if (range->IsFixed() || !range->CanBeSpilled(current->Start())) {
       block_pos[cur_reg] = use_pos[cur_reg] =
           LifetimePosition::FromInstructionIndex(0);
     } else {
@@ skipping 273 matching lines @@
     LiveRange* current = live_ranges()->at(i);
     if (current != NULL) current->Verify();
   }
 }
 
 
 #endif
 
 
 } }  // namespace v8::internal