[Bug tree-optimization/31797] [4.2/4.3 Regression] infinite loop in tree-ssa-pre or ICE

[rguenth at gcc dot gnu dot org]

------- Comment #15 from rguenth at gcc dot gnu dot org  2007-05-12 15:44 
-------
forwprop looses the volatileness (035.dce vs 036.forwprop):

 GTeth_txq_done (sc)
 {
   struct GTeth_desc * txd;
@@ -34,12 +47,10 @@
   goto <bb 6> (<L4>);

 <L0>:;
-  D.1542_3 = &sc_1->txq_desc[0];
   D.1543_4 = sc_1->txq_fi;
   D.1544_5 = D.1543_4 * 4;
   D.1545_6 = (struct GTeth_desc *) D.1544_5;
-  txd_7 = D.1542_3 + D.1545_6;
-  D.1546_8 =/v txd_7->ed_cmdsts;
+  D.1546_8 = sc_1->txq_desc[D.1543_4].ed_cmdsts;
   if (D.1546_8 != 0) goto <L1>; else goto <L2>;

 <L1>:;

I'll take a quick shot.


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31797