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From: "irar at il dot ibm.com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/49926] [4.7 Regression] ice in process_use, at tree-vect-stmts.c:405
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49926

--- Comment #3 from Ira Rosen <irar at il dot ibm.com> 2011-08-01 15:14:50 UTC ---
I am testing this patch:

Index: tree-vect-loop.c
===================================================================
--- tree-vect-loop.c    (revision 177007)
+++ tree-vect-loop.c    (working copy)
@@ -1730,7 +1730,7 @@
   tree lhs;
   imm_use_iterator imm_iter;
   use_operand_p use_p;
-  int nloop_uses, size = 0;
+  int nloop_uses, size = 0, n_out_of_loop_uses;
   bool found = false;

   if (loop != vect_loop)
@@ -1741,6 +1741,7 @@
   while (1)
     {
       nloop_uses = 0;
+      n_out_of_loop_uses = 0;
       FOR_EACH_IMM_USE_FAST (use_p, imm_iter, lhs)
         {
          gimple use_stmt = USE_STMT (use_p);
@@ -1757,16 +1758,22 @@
               break;
             }

-          if (flow_bb_inside_loop_p (loop, gimple_bb (use_stmt))
-              && vinfo_for_stmt (use_stmt)
-             && !STMT_VINFO_IN_PATTERN_P (vinfo_for_stmt (use_stmt)))
-           {
-             loop_use_stmt = use_stmt;
-             nloop_uses++;
-           }
+          if (flow_bb_inside_loop_p (loop, gimple_bb (use_stmt)))
+            {
+              if (vinfo_for_stmt (use_stmt)
+                  && !STMT_VINFO_IN_PATTERN_P (vinfo_for_stmt (use_stmt)))
+                {
+                  loop_use_stmt = use_stmt;
+                  nloop_uses++;
+                }
+            }
+           else
+             n_out_of_loop_uses++;

-          if (nloop_uses > 1)
-            return false;
+           /* There are can be either a single use in the loop or two uses in
+              phi nodes.  */
+           if (nloop_uses > 1 || (n_out_of_loop_uses && nloop_uses))
+             return false;
         }

       if (found)