[v8-dev] ARM: safepoints frame optimization

src/lithium-allocator.cc

Index: src/lithium-allocator.cc
diff --git a/src/lithium-allocator.cc b/src/lithium-allocator.cc
index eae2995695bbf9f971daa7f12cabaa320c0b0663..16f4c0a79aacf08c5261dd3374657d8ed6a80fde 100644
--- a/src/lithium-allocator.cc
+++ b/src/lithium-allocator.cc
@@ -634,9 +634,11 @@ LOperand* LAllocator::AllocateFixed(LUnallocated* operand,
     operand->ConvertTo(LOperand::STACK_SLOT, operand->fixed_slot_index());
   } else if (operand->HasFixedRegisterPolicy()) {
     int reg_index = operand->fixed_register_index();
+    modified_registers_ |= 1 << reg_index;
     operand->ConvertTo(LOperand::REGISTER, reg_index);
   } else if (operand->HasFixedDoubleRegisterPolicy()) {
     int reg_index = operand->fixed_register_index();
+    modified_double_registers_ |= 1 << reg_index;
     operand->ConvertTo(LOperand::DOUBLE_REGISTER, reg_index);
   } else {
     UNREACHABLE();
@@ -1101,6 +1103,8 @@ bool LAllocator::Allocate(LChunk* chunk) {
   assigned_double_registers_ =
       new(chunk->zone()) BitVector(DoubleRegister::NumAllocatableRegisters(),
                                    chunk->zone());
+  modified_registers_ = kRegListEmpty;
+  modified_double_registers_ = kRegListEmpty;
   MeetRegisterConstraints();
   if (!AllocationOk()) return false;
   ResolvePhis();