ARM: Make use of d16-d31 when available.

src/lithium-allocator.cc

Index: src/lithium-allocator.cc
diff --git a/src/lithium-allocator.cc b/src/lithium-allocator.cc
index 91a98112b61bd60a50b56d98f8ca4eebacdf01ff..f9ff55e6a039593cb472d25560bcefa197a25fa9 100644
--- a/src/lithium-allocator.cc
+++ b/src/lithium-allocator.cc
@@ -606,7 +606,7 @@ void LAllocator::AddInitialIntervals(HBasicBlock* block,
 
 
 int LAllocator::FixedDoubleLiveRangeID(int index) {
-  return -index - 1 - Register::kNumAllocatableRegisters;
+  return -index - 1 - Register::kNumAllocatableRegisters; // XXX: This talks about double but uses regular Register::??
 }
 
 
@@ -651,7 +651,7 @@ LiveRange* LAllocator::FixedLiveRangeFor(int index) {
 
 
 LiveRange* LAllocator::FixedDoubleLiveRangeFor(int index) {
-  ASSERT(index < DoubleRegister::kNumAllocatableRegisters);
+  ASSERT(index < DoubleRegister::NumAllocatableRegisters());
   LiveRange* result = fixed_double_live_ranges_[index];
   if (result == NULL) {
     result = new(zone_) LiveRange(FixedDoubleLiveRangeID(index), zone_);
@@ -959,7 +959,7 @@ void LAllocator::ProcessInstructions(HBasicBlock* block, BitVector* live) {
         }
 
         if (instr->IsMarkedAsCall()) {
-          for (int i = 0; i < DoubleRegister::kNumAllocatableRegisters; ++i) {
+          for (int i = 0; i < DoubleRegister::NumAllocatableRegisters(); ++i) {
             if (output == NULL || !output->IsDoubleRegister() ||
                 output->index() != i) {
               LiveRange* range = FixedDoubleLiveRangeFor(i);
@@ -1478,7 +1478,7 @@ void LAllocator::AllocateGeneralRegisters() {
 
 void LAllocator::AllocateDoubleRegisters() {
   HPhase phase("L_Allocate double registers", this);
-  num_registers_ = DoubleRegister::kNumAllocatableRegisters;
+  num_registers_ = DoubleRegister::NumAllocatableRegisters();
   mode_ = DOUBLE_REGISTERS;
   AllocateRegisters();
 }
@@ -1502,7 +1502,7 @@ void LAllocator::AllocateRegisters() {
   ASSERT(inactive_live_ranges_.is_empty());
 
   if (mode_ == DOUBLE_REGISTERS) {
-    for (int i = 0; i < fixed_double_live_ranges_.length(); ++i) {
+    for (int i = 0; i < DoubleRegister::NumAllocatableRegisters(); ++i) {
       LiveRange* current = fixed_double_live_ranges_.at(i);
       if (current != NULL) {
         AddToInactive(current);
@@ -1755,16 +1755,12 @@ void LAllocator::InactiveToActive(LiveRange* range) {
 }
 
 
-// TryAllocateFreeReg and AllocateBlockedReg assume this
-// when allocating local arrays.
-STATIC_ASSERT(DoubleRegister::kNumAllocatableRegisters >=
-              Register::kNumAllocatableRegisters);
-
-
 bool LAllocator::TryAllocateFreeReg(LiveRange* current) {
-  LifetimePosition free_until_pos[DoubleRegister::kNumAllocatableRegisters];
+  ASSERT(DoubleRegister::NumAllocatableRegisters() >=
+         Register::kNumAllocatableRegisters);
+  LifetimePosition free_until_pos[DoubleRegister::kNumRegisters];
 
-  for (int i = 0; i < DoubleRegister::kNumAllocatableRegisters; i++) {
+  for (int i = 0; i < DoubleRegister::NumAllocatableRegisters(); i++) {
     free_until_pos[i] = LifetimePosition::MaxPosition();
   }
 
@@ -1844,6 +1840,8 @@ bool LAllocator::TryAllocateFreeReg(LiveRange* current) {
 
 
 void LAllocator::AllocateBlockedReg(LiveRange* current) {
+  ASSERT(DoubleRegister::NumAllocatableRegisters() >=
+         Register::kNumAllocatableRegisters);
   UsePosition* register_use = current->NextRegisterPosition(current->Start());
   if (register_use == NULL) {
     // There is no use in the current live range that requires a register.
@@ -1853,10 +1851,10 @@ void LAllocator::AllocateBlockedReg(LiveRange* current) {
   }
 
 
-  LifetimePosition use_pos[DoubleRegister::kNumAllocatableRegisters];
-  LifetimePosition block_pos[DoubleRegister::kNumAllocatableRegisters];
+  LifetimePosition use_pos[DoubleRegister::kNumRegisters];
+  LifetimePosition block_pos[DoubleRegister::kNumRegisters];
 
-  for (int i = 0; i < DoubleRegister::kNumAllocatableRegisters; i++) {
+  for (int i = 0; i < DoubleRegister::NumAllocatableRegisters(); i++) {
     use_pos[i] = block_pos[i] = LifetimePosition::MaxPosition();
   }