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

src/ia32/register-allocator-ia32.cc

 // Copyright 2008 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 79 matching lines @@
 }
 
 
 void RegisterAllocator::UnuseReserved(RegisterFile* register_file) {
   register_file->ref_counts_[esp.code()] = 0;
   register_file->ref_counts_[ebp.code()] = 0;
   register_file->ref_counts_[esi.code()] = 0;
 }
 
 
+bool RegisterAllocator::IsReserved(int reg_code) {
+  // Test below relies on the order of register codes.
+  return reg_code >= esp.code() && reg_code <= esi.code();
+}
+
+
 void RegisterAllocator::Initialize() {
   Reset();
   // The following register is live on function entry, saved in the
   // frame, and available for allocation during execution.
   Use(edi);  // JS function.
 }
 
 
 void RegisterAllocator::Reset() {
   registers_.Reset();
@@ skipping 11 matching lines @@
   // register if valid and return an invalid result.
   if (result.is_valid() && !result.reg().is_byte_register()) {
     result.Unuse();
     return Result(cgen_);
   }
   return result;
 }
 
 
 } }  // namespace v8::internal