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comparison src/share/vm/opto/loopTransform.cpp @ 789:273b2358ef1a

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6837146: Should perform unswitch before maximally unroll in loop transformation Summary: Move loop unswitch before maximally unroll Reviewed-by: never
author cfang
date Thu, 28 May 2009 09:37:18 -0700
parents 98cb887364d3
children bd02caa94611
comparison
equal deleted inserted replaced
788:1851e1fb420e 789:273b2358ef1a
1628 compute_profile_trip_cnt(phase); 1628 compute_profile_trip_cnt(phase);
1629 1629
1630 // Before attempting fancy unrolling, RCE or alignment, see if we want 1630 // Before attempting fancy unrolling, RCE or alignment, see if we want
1631 // to completely unroll this loop or do loop unswitching. 1631 // to completely unroll this loop or do loop unswitching.
1632 if( cl->is_normal_loop() ) { 1632 if( cl->is_normal_loop() ) {
1633 if (should_unswitch) {
1634 phase->do_unswitching(this, old_new);
1635 return true;
1636 }
1633 bool should_maximally_unroll = policy_maximally_unroll(phase); 1637 bool should_maximally_unroll = policy_maximally_unroll(phase);
1634 if( should_maximally_unroll ) { 1638 if( should_maximally_unroll ) {
1635 // Here we did some unrolling and peeling. Eventually we will 1639 // Here we did some unrolling and peeling. Eventually we will
1636 // completely unroll this loop and it will no longer be a loop. 1640 // completely unroll this loop and it will no longer be a loop.
1637 phase->do_maximally_unroll(this,old_new); 1641 phase->do_maximally_unroll(this,old_new);
1638 return true;
1639 }
1640 if (should_unswitch) {
1641 phase->do_unswitching(this, old_new);
1642 return true; 1642 return true;
1643 } 1643 }
1644 } 1644 }
1645 1645
1646 1646