Mercurial > hg > graal-jvmci-8

comparison src/share/vm/opto/graphKit.cpp @ 3282:149bb459be66

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
7029167: add support for conditional card marks Reviewed-by: iveresov, kvn
author never
date Wed, 27 Apr 2011 15:40:36 -0700
parents 548597e74aa4
children 286c498ae0d4
comparison
equal deleted inserted replaced
3281:273b56978029 3282:149bb459be66
3445 // Combine card table base and card offset 3445 // Combine card table base and card offset
3446 Node* card_adr = __ AddP(__ top(), byte_map_base_node(), card_offset ); 3446 Node* card_adr = __ AddP(__ top(), byte_map_base_node(), card_offset );
3447 3447
3448 // Get the alias_index for raw card-mark memory 3448 // Get the alias_index for raw card-mark memory
3449 int adr_type = Compile::AliasIdxRaw; 3449 int adr_type = Compile::AliasIdxRaw;
3450 Node* zero = __ ConI(0); // Dirty card value
3451 BasicType bt = T_BYTE;
3452
3453 if (UseCondCardMark) {
3454 // The classic GC reference write barrier is typically implemented
3455 // as a store into the global card mark table. Unfortunately
3456 // unconditional stores can result in false sharing and excessive
3457 // coherence traffic as well as false transactional aborts.
3458 // UseCondCardMark enables MP "polite" conditional card mark
3459 // stores. In theory we could relax the load from ctrl() to
3460 // no_ctrl, but that doesn't buy much latitude.
3461 Node* card_val = __ load( __ ctrl(), card_adr, TypeInt::BYTE, bt, adr_type);
3462 __ if_then(card_val, BoolTest::ne, zero);
3463 }
3464
3450 // Smash zero into card 3465 // Smash zero into card
3451 Node* zero = __ ConI(0);
3452 BasicType bt = T_BYTE;
3453 if( !UseConcMarkSweepGC ) { 3466 if( !UseConcMarkSweepGC ) {
3454 __ store(__ ctrl(), card_adr, zero, bt, adr_type); 3467 __ store(__ ctrl(), card_adr, zero, bt, adr_type);
3455 } else { 3468 } else {
3456 // Specialized path for CM store barrier 3469 // Specialized path for CM store barrier
3457 __ storeCM(__ ctrl(), card_adr, zero, oop_store, adr_idx, bt, adr_type); 3470 __ storeCM(__ ctrl(), card_adr, zero, oop_store, adr_idx, bt, adr_type);
3471 }
3472
3473 if (UseCondCardMark) {
3474 __ end_if();
3458 } 3475 }
3459 3476
3460 // Final sync IdealKit and GraphKit. 3477 // Final sync IdealKit and GraphKit.
3461 final_sync(ideal); 3478 final_sync(ideal);
3462 } 3479 }