Mercurial > jdk8-mips64-public > hotspot / file comparison
comparison: src/share/vm/opto/matcher.cpp
src/share/vm/opto/matcher.cpp
- changeset 6489
- 50fdb38839eb
- parent 6485
- da862781b584
- child 6490
- 41b780b43b74
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inserted
replaced
| 6488:4cdf4f71177d | 6489:50fdb38839eb |
|---|---|
| 2331 // intervening volatile load, and thus we don't need a barrier here. | 2331 // intervening volatile load, and thus we don't need a barrier here. |
| 2332 // We retain the Node to act as a compiler ordering barrier. | 2332 // We retain the Node to act as a compiler ordering barrier. |
| 2333 bool Matcher::post_store_load_barrier(const Node* vmb) { | 2333 bool Matcher::post_store_load_barrier(const Node* vmb) { |
| 2334 Compile* C = Compile::current(); | 2334 Compile* C = Compile::current(); |
| 2335 assert(vmb->is_MemBar(), ""); | 2335 assert(vmb->is_MemBar(), ""); |
| 2336 assert(vmb->Opcode() != Op_MemBarAcquire, ""); | 2336 assert(vmb->Opcode() != Op_MemBarAcquire && vmb->Opcode() != Op_LoadFence, ""); |
| 2337 const MemBarNode* membar = vmb->as_MemBar(); | 2337 const MemBarNode* membar = vmb->as_MemBar(); |
| 2338 | 2338 |
| 2339 // Get the Ideal Proj node, ctrl, that can be used to iterate forward | 2339 // Get the Ideal Proj node, ctrl, that can be used to iterate forward |
| 2340 Node* ctrl = NULL; | 2340 Node* ctrl = NULL; |
| 2341 for (DUIterator_Fast imax, i = membar->fast_outs(imax); i < imax; i++) { | 2341 for (DUIterator_Fast imax, i = membar->fast_outs(imax); i < imax; i++) { |
| 2376 } | 2376 } |
| 2377 | 2377 |
| 2378 if (x->is_MemBar()) { | 2378 if (x->is_MemBar()) { |
| 2379 // We must retain this membar if there is an upcoming volatile | 2379 // We must retain this membar if there is an upcoming volatile |
| 2380 // load, which will be followed by acquire membar. | 2380 // load, which will be followed by acquire membar. |
| 2381 if (xop == Op_MemBarAcquire) { | 2381 if (xop == Op_MemBarAcquire || xop == Op_LoadFence) { |
| 2382 return false; | 2382 return false; |
| 2383 } else { | 2383 } else { |
| 2384 // For other kinds of barriers, check by pretending we | 2384 // For other kinds of barriers, check by pretending we |
| 2385 // are them, and seeing if we can be removed. | 2385 // are them, and seeing if we can be removed. |
| 2386 return post_store_load_barrier(x->as_MemBar()); | 2386 return post_store_load_barrier(x->as_MemBar()); |
