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comparison src/share/vm/opto/loopopts.cpp @ 3281:273b56978029

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7039586: test/java/util/Collections/Rotate.java failing with hs21-b09 Summary: A predicate should not be moved in partial peel optimization since it will invalidate jvm state of its uncommon trap. Reviewed-by: never
author kvn
date Tue, 26 Apr 2011 12:14:22 -0700
parents 6c97c830fb6f
children 4e761e7e6e12
comparison
equal deleted inserted replaced
3280:548597e74aa4 3281:273b56978029
2260 // final graph 2260 // final graph
2261 // 2261 //
2262 // stmt1 2262 // stmt1
2263 // | 2263 // |
2264 // v 2264 // v
2265 // loop predicate
2266 // |
2267 // v
2265 // stmt2 clone 2268 // stmt2 clone
2266 // | 2269 // |
2267 // v 2270 // v
2268 // ........> ifA clone 2271 // ........> ifA clone
2269 // : / | 2272 // : / |
2270 // dom / | 2273 // dom / |
2271 // : v v 2274 // : v v
2272 // : false true 2275 // : false true
2273 // : | |
2274 // : | v
2275 // : | loop predicate
2276 // : | | 2276 // : | |
2277 // : | v 2277 // : | v
2278 // : | newloop<-----+ 2278 // : | newloop<-----+
2279 // : | | | 2279 // : | | |
2280 // : | stmt3 clone | 2280 // : | stmt3 clone |
2328 #endif 2328 #endif
2329 return false; 2329 return false;
2330 } 2330 }
2331 } 2331 }
2332 2332
2333 Node* entry = head->in(LoopNode::EntryControl);
2334 int dd = dom_depth(head); 2333 int dd = dom_depth(head);
2335 2334
2336 // Step 1: find cut point 2335 // Step 1: find cut point
2337 2336
2338 // Walk up dominators to loop head looking for first loop exit 2337 // Walk up dominators to loop head looking for first loop exit
2625 } 2624 }
2626 } 2625 }
2627 2626
2628 // Backedge of the surviving new_head (the clone) is original last_peel 2627 // Backedge of the surviving new_head (the clone) is original last_peel
2629 _igvn.hash_delete(new_head_clone); 2628 _igvn.hash_delete(new_head_clone);
2630 Node* new_entry = move_loop_predicates(entry, new_head_clone->in(LoopNode::EntryControl));
2631 new_head_clone->set_req(LoopNode::EntryControl, new_entry);
2632 new_head_clone->set_req(LoopNode::LoopBackControl, last_peel); 2629 new_head_clone->set_req(LoopNode::LoopBackControl, last_peel);
2633 _igvn._worklist.push(new_head_clone); 2630 _igvn._worklist.push(new_head_clone);
2634 2631
2635 // Cut first node in original not_peel set 2632 // Cut first node in original not_peel set
2636 _igvn.hash_delete(new_head); 2633 _igvn.hash_delete(new_head);