Author: laijx
Date: 2010-12-20 14:43:33 -0500 (Mon, 20 Dec 2010)
New Revision: 3441
Modified:
trunk/osprey/be/opt/opt_dce.cxx
Log:
Fix bug #659. The BB9 is unreachable in the first pass of DCE and
connected to fake entry. In the second pass of DCE, BB9 is deleted but
the DOM is not updated. Thia patch set the change_cflow to recompute the
DOM.
Code review by Sun.
Modified: trunk/osprey/be/opt/opt_dce.cxx
===================================================================
--- trunk/osprey/be/opt/opt_dce.cxx 2010-12-20 19:32:42 UTC (rev 3440)
+++ trunk/osprey/be/opt/opt_dce.cxx 2010-12-20 19:43:33 UTC (rev 3441)
@@ -1826,6 +1826,10 @@
nextsucc = succ_ref->Next();
changed_cflow |= Update_predecessor_lists( succ_ref->Node() );
}
+ if (bb->Pred() == NULL) {
+ // bb from fake entry is removed, cfg is changed
+ changed_cflow = TRUE;
+ }
_cfg->Remove_bb(bb);
#ifdef Is_True_On
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