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6837146: Should perform unswitch before maximally unroll in loop transformation

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Move loop unswitch before maximally unroll

Reviewed-by: never
This commit is contained in:
Changpeng Fang 2009-05-28 09:37:18 -07:00
parent 802f3552f9
commit f981546f2d
1 changed files with 4 additions and 4 deletions
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8
hotspot/src/share/vm/opto/loopTransform.cpp
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@ -1630,6 +1630,10 @@ bool IdealLoopTree::iteration_split_impl( PhaseIdealLoop *phase, Node_List &old_
// Before attempting fancy unrolling, RCE or alignment, see if we want
// to completely unroll this loop or do loop unswitching.
if( cl->is_normal_loop() ) {
if (should_unswitch) {
phase->do_unswitching(this, old_new);
return true;
}
bool should_maximally_unroll = policy_maximally_unroll(phase);
if( should_maximally_unroll ) {
// Here we did some unrolling and peeling. Eventually we will
@ -1637,10 +1641,6 @@ bool IdealLoopTree::iteration_split_impl( PhaseIdealLoop *phase, Node_List &old_
phase->do_maximally_unroll(this,old_new);
return true;
}
if (should_unswitch) {
phase->do_unswitching(this, old_new);
return true;
}
}