Simplify JumpTarget::ComputeEntryFrame. Eliminate a separate pass...

src/arm/register-allocator-arm.cc

 // Copyright 2009 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 48 matching lines @@
 
 
 void RegisterAllocator::UnuseReserved(RegisterFile* register_file) {
   register_file->ref_counts_[sp.code()] = 0;
   register_file->ref_counts_[fp.code()] = 0;
   register_file->ref_counts_[cp.code()] = 0;
   register_file->ref_counts_[pc.code()] = 0;
 }
 
 
+bool RegisterAllocator::IsReserved(int reg_code) {
+  return (reg_code == sp.code())
+      || (reg_code == fp.code())
+      || (reg_code == cp.code())
+      || (reg_code == pc.code());
+}
+
+
 void RegisterAllocator::Initialize() {
   Reset();
   // The following registers are live on function entry, saved in the
   // frame, and available for allocation during execution.
   Use(r1);  // JS function.
   Use(lr);  // Return address.
 }
 
 
 void RegisterAllocator::Reset() {
   registers_.Reset();
   // The following registers are live on function entry and reserved
   // during execution.
   Use(sp);  // Stack pointer.
   Use(fp);  // Frame pointer (caller's frame pointer on entry).
   Use(cp);  // Context context (callee's context on entry).
   Use(pc);  // Program counter.
 }
 
 
 Result RegisterAllocator::AllocateByteRegisterWithoutSpilling() {
   UNIMPLEMENTED();
   Result invalid(cgen_);
   return invalid;
 }
 
 
 } }  // namespace v8::internal