Mercurial > hg > truffle
comparison src/share/vm/opto/loopnode.hpp @ 3788:e3cbc9ddd434
7044738: Loop unroll optimization causes incorrect result
Summary: take into account memory dependencies when clonning nodes in clone_up_backedge_goo().
Reviewed-by: never
| author | kvn |
|---|---|
| date | Tue, 28 Jun 2011 15:24:29 -0700 |
| parents | 38569792a45a |
| children | 4e761e7e6e12 |
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| 3787:6ae7a1561b53 | 3788:e3cbc9ddd434 |
|---|---|
| 841 // Add pre and post loops around the given loop. These loops are used | 841 // Add pre and post loops around the given loop. These loops are used |
| 842 // during RCE, unrolling and aligning loops. | 842 // during RCE, unrolling and aligning loops. |
| 843 void insert_pre_post_loops( IdealLoopTree *loop, Node_List &old_new, bool peel_only ); | 843 void insert_pre_post_loops( IdealLoopTree *loop, Node_List &old_new, bool peel_only ); |
| 844 // If Node n lives in the back_ctrl block, we clone a private version of n | 844 // If Node n lives in the back_ctrl block, we clone a private version of n |
| 845 // in preheader_ctrl block and return that, otherwise return n. | 845 // in preheader_ctrl block and return that, otherwise return n. |
| 846 Node *clone_up_backedge_goo( Node *back_ctrl, Node *preheader_ctrl, Node *n ); | 846 Node *clone_up_backedge_goo( Node *back_ctrl, Node *preheader_ctrl, Node *n, VectorSet &visited, Node_Stack &clones ); |
| 847 | 847 |
| 848 // Take steps to maximally unroll the loop. Peel any odd iterations, then | 848 // Take steps to maximally unroll the loop. Peel any odd iterations, then |
| 849 // unroll to do double iterations. The next round of major loop transforms | 849 // unroll to do double iterations. The next round of major loop transforms |
| 850 // will repeat till the doubled loop body does all remaining iterations in 1 | 850 // will repeat till the doubled loop body does all remaining iterations in 1 |
| 851 // pass. | 851 // pass. |