[tree-ssa] Make tsi insert iterators handle chains of COMPOUND_EXPRs

[Richard Henderson]

On Thu, Aug 28, 2003 at 11:59:13PM +0200, Zdenek Dvorak wrote:
> this would be fine with me; what gets wrong is that
> 	tsi_link_after (tsi, a, TSI_NEW_STMT);
> 	tsi_link_before (tsi, b, TSI_NEW_STMT);
> 
> will put b in the middle of a; which is inconsistend with the fact that
> tsi_link_before would not.

If it did, that would be a bug in the implementation of 
tsi_link_before.  The chain should have be:

  start, tsi_stmt(tsi) == x

	(ce 		<- ip
	  x
	  y)

  tsi_link_after (tsi, a, TSI_NEW_STMT);

	(ce
	  x
	  (ce		<- ip
	    a1
	    (ce
	      a2
	      y)))

  tsi_link_before (tsi, b, TSI_NEW_STMT);

	(ce
	  x
	  (ce		<- ip
	    b1
	    (ce
	      b2
	      (ce
		a1
		(ce
		  a2
		  y)))))


r~