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6667595: Set probability FAIR for pre-, post- loops and ALWAYS for main loop

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Fix loop's probability. Add optimizations to avoid spilling. Change InlineSmallCode to product flag.

Reviewed-by: never
This commit is contained in:
Vladimir Kozlov 2008-10-02 08:37:44 -07:00
parent 453d1a42b0
commit adce6fc49a
9 changed files with 156 additions and 49 deletions
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11
hotspot/src/share/vm/opto/loopTransform.cpp
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@ -679,6 +679,10 @@ void PhaseIdealLoop::insert_pre_post_loops( IdealLoopTree *loop, Node_List &old_
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 @@ void PhaseIdealLoop::insert_pre_post_loops( IdealLoopTree *loop, Node_List &old_
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 @@ void PhaseIdealLoop::insert_pre_post_loops( IdealLoopTree *loop, Node_List &old_
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);