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7004535: Clone loop predicate during loop unswitch

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Clone loop predicate for clonned loops

Reviewed-by: never
This commit is contained in:
Vladimir Kozlov 2011-04-02 10:54:15 -07:00
parent 68f1177f59
commit 00eca5e982
14 changed files with 1298 additions and 716 deletions
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27
hotspot/src/share/vm/opto/loopopts.cpp
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@ -2139,9 +2139,12 @@ bool PhaseIdealLoop::is_valid_clone_loop_form( IdealLoopTree *loop, Node_List& p
//
// orig
//
// stmt1
// |
// v
// stmt1
// |
// v
// loop predicate
// |
// v
// loop<----+
// | |
// stmt2 |
@ -2172,6 +2175,9 @@ bool PhaseIdealLoop::is_valid_clone_loop_form( IdealLoopTree *loop, Node_List& p
// after clone loop
//
// stmt1
// |
// v
// loop predicate
// / \
// clone / \ orig
// / \
@ -2210,12 +2216,15 @@ bool PhaseIdealLoop::is_valid_clone_loop_form( IdealLoopTree *loop, Node_List& p
// after partial peel
//
// stmt1
// |
// v
// loop predicate
// /
// clone / orig
// / TOP
// / \
// v v
// TOP->region region----+
// TOP->loop loop----+
// | | |
// stmt2 stmt2 |
// | | |
@ -2253,13 +2262,17 @@ bool PhaseIdealLoop::is_valid_clone_loop_form( IdealLoopTree *loop, Node_List& p
// stmt1
// |
// v
// stmt2 clone
// |
// v
// ........> ifA clone
// : / |
// dom / |
// : v v
// : false true
// : | |
// : | stmt2 clone
// : | v
// : | loop predicate
// : | |
// : | v
// : | newloop<-----+
@ -2289,6 +2302,7 @@ bool PhaseIdealLoop::is_valid_clone_loop_form( IdealLoopTree *loop, Node_List& p
//
bool PhaseIdealLoop::partial_peel( IdealLoopTree *loop, Node_List &old_new ) {
assert(!loop->_head->is_CountedLoop(), "Non-counted loop only");
if (!loop->_head->is_Loop()) {
return false; }
@ -2316,6 +2330,7 @@ bool PhaseIdealLoop::partial_peel( IdealLoopTree *loop, Node_List &old_new ) {
}
}
Node* entry = head->in(LoopNode::EntryControl);
int dd = dom_depth(head);
// Step 1: find cut point
@ -2612,6 +2627,8 @@ bool PhaseIdealLoop::partial_peel( IdealLoopTree *loop, Node_List &old_new ) {
// Backedge of the surviving new_head (the clone) is original last_peel
_igvn.hash_delete(new_head_clone);
Node* new_entry = move_loop_predicates(entry, new_head_clone->in(LoopNode::EntryControl));
new_head_clone->set_req(LoopNode::EntryControl, new_entry);
new_head_clone->set_req(LoopNode::LoopBackControl, last_peel);
_igvn._worklist.push(new_head_clone);