3831
3832 // Get the alias_index for raw card-mark memory
3833 int adr_type = Compile::AliasIdxRaw;
3834 Node* zero = __ ConI(0); // Dirty card value
3835 BasicType bt = T_BYTE;
3836
3837 if (UseCondCardMark) {
3838 // The classic GC reference write barrier is typically implemented
3839 // as a store into the global card mark table. Unfortunately
3840 // unconditional stores can result in false sharing and excessive
3841 // coherence traffic as well as false transactional aborts.
3842 // UseCondCardMark enables MP "polite" conditional card mark
3843 // stores. In theory we could relax the load from ctrl() to
3844 // no_ctrl, but that doesn't buy much latitude.
3845 Node* card_val = __ load( __ ctrl(), card_adr, TypeInt::BYTE, bt, adr_type);
3846 __ if_then(card_val, BoolTest::ne, zero);
3847 }
3848
3849 // Smash zero into card
3850 if( !UseConcMarkSweepGC ) {
3851 __ store(__ ctrl(), card_adr, zero, bt, adr_type, MemNode::release);
3852 } else {
3853 // Specialized path for CM store barrier
3854 __ storeCM(__ ctrl(), card_adr, zero, oop_store, adr_idx, bt, adr_type);
3855 }
3856
3857 if (UseCondCardMark) {
3858 __ end_if();
3859 }
3860
3861 // Final sync IdealKit and GraphKit.
3862 final_sync(ideal);
3863 }
3864
3865 // G1 pre/post barriers
3866 void GraphKit::g1_write_barrier_pre(bool do_load,
3867 Node* obj,
3868 Node* adr,
3869 uint alias_idx,
3870 Node* val,
3871 const TypeOopPtr* val_type,
|
3831
3832 // Get the alias_index for raw card-mark memory
3833 int adr_type = Compile::AliasIdxRaw;
3834 Node* zero = __ ConI(0); // Dirty card value
3835 BasicType bt = T_BYTE;
3836
3837 if (UseCondCardMark) {
3838 // The classic GC reference write barrier is typically implemented
3839 // as a store into the global card mark table. Unfortunately
3840 // unconditional stores can result in false sharing and excessive
3841 // coherence traffic as well as false transactional aborts.
3842 // UseCondCardMark enables MP "polite" conditional card mark
3843 // stores. In theory we could relax the load from ctrl() to
3844 // no_ctrl, but that doesn't buy much latitude.
3845 Node* card_val = __ load( __ ctrl(), card_adr, TypeInt::BYTE, bt, adr_type);
3846 __ if_then(card_val, BoolTest::ne, zero);
3847 }
3848
3849 // Smash zero into card
3850 if( !UseConcMarkSweepGC ) {
3851 #if defined(AARCH64)
3852 __ store(__ ctrl(), card_adr, zero, bt, adr_type, MemNode::unordered);
3853 #else
3854 __ store(__ ctrl(), card_adr, zero, bt, adr_type, MemNode::release);
3855 #endif
3856 } else {
3857 // Specialized path for CM store barrier
3858 __ storeCM(__ ctrl(), card_adr, zero, oop_store, adr_idx, bt, adr_type);
3859 }
3860
3861 if (UseCondCardMark) {
3862 __ end_if();
3863 }
3864
3865 // Final sync IdealKit and GraphKit.
3866 final_sync(ideal);
3867 }
3868
3869 // G1 pre/post barriers
3870 void GraphKit::g1_write_barrier_pre(bool do_load,
3871 Node* obj,
3872 Node* adr,
3873 uint alias_idx,
3874 Node* val,
3875 const TypeOopPtr* val_type,
|