Mercurial > jdk8-mips64-public > hotspot / file comparison
comparison: src/share/vm/opto/ifg.cpp
src/share/vm/opto/ifg.cpp
- changeset 1001
- 91263420e1c6
- parent 815
- eb28cf662f56
- child 1014
- 0fbdb4381b99
- child 1040
- 98cb887364d3
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| 1000:7fe62bb75bf4 | 1001:91263420e1c6 |
|---|---|
| 469 Block *b = _cfg._blocks[i]; | 469 Block *b = _cfg._blocks[i]; |
| 470 // Clone (rather than smash in place) the liveout info, so it is alive | 470 // Clone (rather than smash in place) the liveout info, so it is alive |
| 471 // for the "collect_gc_info" phase later. | 471 // for the "collect_gc_info" phase later. |
| 472 IndexSet liveout(_live->live(b)); | 472 IndexSet liveout(_live->live(b)); |
| 473 uint last_inst = b->end_idx(); | 473 uint last_inst = b->end_idx(); |
| 474 // Compute last phi index | 474 // Compute first nonphi node index |
| 475 uint last_phi; | 475 uint first_inst; |
| 476 for( last_phi = 1; last_phi < last_inst; last_phi++ ) | 476 for( first_inst = 1; first_inst < last_inst; first_inst++ ) |
| 477 if( !b->_nodes[last_phi]->is_Phi() ) | 477 if( !b->_nodes[first_inst]->is_Phi() ) |
| 478 break; | 478 break; |
| 479 | |
| 480 // Spills could be inserted before CreateEx node which should be | |
| 481 // first instruction in block after Phis. Move CreateEx up. | |
| 482 for( uint insidx = first_inst; insidx < last_inst; insidx++ ) { | |
| 483 Node *ex = b->_nodes[insidx]; | |
| 484 if( ex->is_SpillCopy() ) continue; | |
| 485 if( insidx > first_inst && ex->is_Mach() && | |
| 486 ex->as_Mach()->ideal_Opcode() == Op_CreateEx ) { | |
| 487 // If the CreateEx isn't above all the MachSpillCopies | |
| 488 // then move it to the top. | |
| 489 b->_nodes.remove(insidx); | |
| 490 b->_nodes.insert(first_inst, ex); | |
| 491 } | |
| 492 // Stop once a CreateEx or any other node is found | |
| 493 break; | |
| 494 } | |
| 479 | 495 |
| 480 // Reset block's register pressure values for each ifg construction | 496 // Reset block's register pressure values for each ifg construction |
| 481 uint pressure[2], hrp_index[2]; | 497 uint pressure[2], hrp_index[2]; |
| 482 pressure[0] = pressure[1] = 0; | 498 pressure[0] = pressure[1] = 0; |
| 483 hrp_index[0] = hrp_index[1] = last_inst+1; | 499 hrp_index[0] = hrp_index[1] = last_inst+1; |
| 484 b->_reg_pressure = b->_freg_pressure = 0; | 500 b->_reg_pressure = b->_freg_pressure = 0; |
| 485 // Liveout things are presumed live for the whole block. We accumulate | 501 // Liveout things are presumed live for the whole block. We accumulate |
| 486 // 'area' accordingly. If they get killed in the block, we'll subtract | 502 // 'area' accordingly. If they get killed in the block, we'll subtract |
| 487 // the unused part of the block from the area. | 503 // the unused part of the block from the area. |
| 488 int inst_count = last_inst - last_phi; | 504 int inst_count = last_inst - first_inst; |
| 489 double cost = (inst_count <= 0) ? 0.0 : b->_freq * double(inst_count); | 505 double cost = (inst_count <= 0) ? 0.0 : b->_freq * double(inst_count); |
| 490 assert(!(cost < 0.0), "negative spill cost" ); | 506 assert(!(cost < 0.0), "negative spill cost" ); |
| 491 IndexSetIterator elements(&liveout); | 507 IndexSetIterator elements(&liveout); |
| 492 uint lidx; | 508 uint lidx; |
| 493 while ((lidx = elements.next()) != 0) { | 509 while ((lidx = elements.next()) != 0) { |
