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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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17
hotspot/src/share/vm/opto/compile.cpp
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@ -1632,7 +1632,6 @@ void Compile::cleanup_loop_predicates(PhaseIterGVN &igvn) {
igvn.replace_node(n, n->in(1));
}
assert(predicate_count()==0, "should be clean!");
igvn.optimize();
}
//------------------------------Optimize---------------------------------------
@ -1689,7 +1688,7 @@ void Compile::Optimize() {
if((loop_opts_cnt > 0) && (has_loops() || has_split_ifs())) {
{
TracePhase t2("idealLoop", &_t_idealLoop, true);
PhaseIdealLoop ideal_loop( igvn, true, UseLoopPredicate);
PhaseIdealLoop ideal_loop( igvn, true );
loop_opts_cnt--;
if (major_progress()) print_method("PhaseIdealLoop 1", 2);
if (failing()) return;
@ -1697,7 +1696,7 @@ void Compile::Optimize() {
// Loop opts pass if partial peeling occurred in previous pass
if(PartialPeelLoop && major_progress() && (loop_opts_cnt > 0)) {
TracePhase t3("idealLoop", &_t_idealLoop, true);
PhaseIdealLoop ideal_loop( igvn, false, UseLoopPredicate);
PhaseIdealLoop ideal_loop( igvn, false );
loop_opts_cnt--;
if (major_progress()) print_method("PhaseIdealLoop 2", 2);
if (failing()) return;
@ -1705,7 +1704,7 @@ void Compile::Optimize() {
// Loop opts pass for loop-unrolling before CCP
if(major_progress() && (loop_opts_cnt > 0)) {
TracePhase t4("idealLoop", &_t_idealLoop, true);
PhaseIdealLoop ideal_loop( igvn, false, UseLoopPredicate);
PhaseIdealLoop ideal_loop( igvn, false );
loop_opts_cnt--;
if (major_progress()) print_method("PhaseIdealLoop 3", 2);
}
@ -1743,21 +1742,13 @@ void Compile::Optimize() {
// peeling, unrolling, etc.
if(loop_opts_cnt > 0) {
debug_only( int cnt = 0; );
bool loop_predication = UseLoopPredicate;
while(major_progress() && (loop_opts_cnt > 0)) {
TracePhase t2("idealLoop", &_t_idealLoop, true);
assert( cnt++ < 40, "infinite cycle in loop optimization" );
PhaseIdealLoop ideal_loop( igvn, true, loop_predication);
PhaseIdealLoop ideal_loop( igvn, true);
loop_opts_cnt--;
if (major_progress()) print_method("PhaseIdealLoop iterations", 2);
if (failing()) return;
// Perform loop predication optimization during first iteration after CCP.
// After that switch it off and cleanup unused loop predicates.
if (loop_predication) {
loop_predication = false;
cleanup_loop_predicates(igvn);
if (failing()) return;
}
}
}