Mercurial > hg > graal-compiler
diff src/share/vm/opto/loopTransform.cpp @ 400:cc80376deb0c
6667595: Set probability FAIR for pre-, post- loops and ALWAYS for main loop
Summary: Fix loop's probability. Add optimizations to avoid spilling. Change InlineSmallCode to product flag.
Reviewed-by: never
| author | kvn |
|---|---|
| date | Thu, 02 Oct 2008 08:37:44 -0700 |
| parents | 194b8e3a2fc4 |
| children | ee8f06bfb27c |
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--- a/src/share/vm/opto/loopTransform.cpp Tue Sep 30 15:53:55 2008 -0700 +++ b/src/share/vm/opto/loopTransform.cpp Thu Oct 02 08:37:44 2008 -0700 @@ -679,6 +679,10 @@ CountedLoopNode *post_head = old_new[main_head->_idx]->as_CountedLoop(); post_head->set_post_loop(main_head); + // Reduce the post-loop trip count. + CountedLoopEndNode* post_end = old_new[main_end ->_idx]->as_CountedLoopEnd(); + post_end->_prob = PROB_FAIR; + // Build the main-loop normal exit. IfFalseNode *new_main_exit = new (C, 1) IfFalseNode(main_end); _igvn.register_new_node_with_optimizer( new_main_exit ); @@ -748,6 +752,9 @@ pre_head->set_pre_loop(main_head); Node *pre_incr = old_new[incr->_idx]; + // Reduce the pre-loop trip count. + pre_end->_prob = PROB_FAIR; + // Find the pre-loop normal exit. Node* pre_exit = pre_end->proj_out(false); assert( pre_exit->Opcode() == Op_IfFalse, "" ); @@ -767,8 +774,8 @@ register_new_node( min_cmp , new_pre_exit ); register_new_node( min_bol , new_pre_exit ); - // Build the IfNode - IfNode *min_iff = new (C, 2) IfNode( new_pre_exit, min_bol, PROB_FAIR, COUNT_UNKNOWN ); + // Build the IfNode (assume the main-loop is executed always). + IfNode *min_iff = new (C, 2) IfNode( new_pre_exit, min_bol, PROB_ALWAYS, COUNT_UNKNOWN ); _igvn.register_new_node_with_optimizer( min_iff ); set_idom(min_iff, new_pre_exit, dd_main_head); set_loop(min_iff, loop->_parent);