IA32: Avoid going into stubs or runtime code for bitops even if the...

src/codegen.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 59 matching lines @@
     DeferredCode* code = deferred_.RemoveLast();
     ASSERT(masm_ == code->masm());
     // Record position of deferred code stub.
     masm_->RecordStatementPosition(code->statement_position());
     if (code->position() != RelocInfo::kNoPosition) {
       masm_->RecordPosition(code->position());
     }
     // Generate the code.
     Comment cmnt(masm_, code->comment());
     masm_->bind(code->entry_label());
-    code->SaveRegisters();
+    if (code->AutoSaveAndRestore()) {
+      code->SaveRegisters();
+    }
     code->Generate();
-    code->RestoreRegisters();
-    masm_->jmp(code->exit_label());
+    if (code->AutoSaveAndRestore()) {
+      code->RestoreRegisters();
+      code->Exit();
+    }
   }
 }
 
 
+void DeferredCode::Exit() {
+  masm_->jmp(exit_label());
+}
+
+
 void CodeGenerator::SetFrame(VirtualFrame* new_frame,
                              RegisterFile* non_frame_registers) {
   RegisterFile saved_counts;
   if (has_valid_frame()) {
     frame_->DetachFromCodeGenerator();
     // The remaining register reference counts are the non-frame ones.
     allocator_->SaveTo(&saved_counts);
   }
 
   if (new_frame != NULL) {
@@ skipping 409 matching lines @@
   }
 }
 
 
 void ApiGetterEntryStub::SetCustomCache(Code* value) {
   info()->set_load_stub_cache(value);
 }
 
 
 } }  // namespace v8::internal