Author: yug
Date: 2011-10-10 06:46:29 -0400 (Mon, 10 Oct 2011)
New Revision: 3756
Modified:
trunk/osprey/be/opt/opt_cfg.cxx
Log:
Fix bug869, single succ bb for TRUEBR. Code Review: Lai Jianxin
Modified: trunk/osprey/be/opt/opt_cfg.cxx
===================================================================
--- trunk/osprey/be/opt/opt_cfg.cxx 2011-10-10 06:57:05 UTC (rev 3755)
+++ trunk/osprey/be/opt/opt_cfg.cxx 2011-10-10 10:46:29 UTC (rev 3756)
@@ -3189,6 +3189,19 @@
("Non-empty block assigned to a label") );
// if we're trying to add this label to a non-empty block, we
// need to end the current block, and connect the new one to it
+
+ // fix bug869(open64.net), check to see whether last statement of
_current_bb
+ // is OPR_FALSEBR/OPR_TRUEBR, and the statment's label bb is label_bb.
+ // if so, add the null fall-through bb and set it be the current bb
+ WN* last_wn=_current_bb->Laststmt();
+ if (last_wn &&
+ (OPCODE_operator(WN_opcode(last_wn)) == OPR_FALSEBR ||
+ OPCODE_operator(WN_opcode(last_wn)) == OPR_TRUEBR) &&
+ Get_bb_from_label( WN_label_number(last_wn)) == label_bb) {
+ BB_NODE* fall_through_bb= Create_bb();
+ Connect_predsucc(_current_bb,fall_through_bb);
+ Append_bb(fall_through_bb);
+ }
if ( ! _current_bb->Hasujp() )
Connect_predsucc( _current_bb, label_bb );
Append_bb( label_bb );
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