contrib/gcc/tree-ssa-threadupdate.c

50      2. Remove the control statement at the end of B' and all outgoing edges
72      7. Put the duplicated resources in B and all the B' blocks into SSA form.
77    B instead of creating B' for one destination if all edges into B are
81    not copying all the outgoing edges and the control statement in
87    all the incoming edges which thread to the same destination edge at
127      all incoming edges and thus are using BB itself as a duplicate block.  */
167    Also remove all outgoing edges except the edge which reaches DEST_BB.
168    If DEST_BB is NULL, then remove all outgoing edges.  */
217      specialized block copier.  We also remove all outgoing edges
389 /* Not all jump threading requests are useful.  In particular some
493 	 So look at all of BB's incoming edges which are not
495 	 If that subset of incoming edges do not all thread
507 	     If all backedges thread to new locations, then this
592   /* Walk over all the incoming edges associated associated with this
605          to clear it will cause all kinds of unpleasant problems later.  */
706    properties we can exploit here is that all the resources set
725   /* ALL indicates whether or not all incoming edges into BB should
727   bool all = true;
766 	  all = false;
780   /* If we are going to thread all incoming edges to an outgoing edge, then
784   if (all)
796      tail of the duplicate as well as all outgoing edges from the
807      We do this after creating all the duplicates to avoid creating
834    This form avoids the need to walk all the edges in the CFG to
854 /* Walk through all blocks and thread incoming edges to the appropriate
897 /* Register a jump threading opportunity.  We queue up all the jump
899    and SSA form all at once.