re PR tree-optimization/34591 (internal compiler error: in cost_for_stmt, at…

re PR tree-optimization/34591 (internal compiler error: in cost_for_stmt, at tree-vect-transform.c:98)

        PR tree-optimization/34591
        * tree-vect-trasnform.c (vect_estimate_min_profitable_iters): Skip
        stmts (including reduction stmts) that are not live.

From-SVN: r131206

gcc/ChangeLog

+2007-12-27  Dorit Nuzman  <dorit@il.ibm.com>
+
+	PR tree-optimization/34591
+	* tree-vect-trasnform.c (vect_estimate_min_profitable_iters): Skip
+	stmts (including reduction stmts) that are not live.
+
 2007-12-27  Jakub Jelinek  <jakub@redhat.com>
 
 	PR target/34281

gcc/testsuite/ChangeLog

+2007-12-27  Dorit Nuzman  <dorit@il.ibm.com>
+
+	PR tree-optimization/34591
+	* gcc.dg/vect/pr34591.c: New test.
+
 2007-12-27  Thomas Koenig  <tkoenig@gcc.gnu.org>
 
 	PR libfortran/34594

gcc/testsuite/gcc.dg/vect/pr34591.c

+/* { dg-do compile } */
+
+int av_resample(int filter_length, short *src, short *filter)
+{
+    int i;
+    int val=0;
+    for(i=0; i<filter_length; i++)
+      val += src[ i ] * filter[i];
+    return val;
+}
+
+/* { dg-final { cleanup-tree-dump "vect" } } */

gcc/tree-vect-transform.c

@@ -202,7 +202,8 @@ vect_estimate_min_profitable_iters (loop_vec_info loop_vinfo)
 	  stmt_vec_info stmt_info = vinfo_for_stmt (stmt);
 	  /* Skip stmts that are not vectorized inside the loop.  */
 	  if (!STMT_VINFO_RELEVANT_P (stmt_info)
-	      && STMT_VINFO_DEF_TYPE (stmt_info) != vect_reduction_def)
+	      && (!STMT_VINFO_LIVE_P (stmt_info)
+		  || STMT_VINFO_DEF_TYPE (stmt_info) != vect_reduction_def))
 	    continue;
 	  scalar_single_iter_cost += cost_for_stmt (stmt) * factor;
 	  vec_inside_cost += STMT_VINFO_INSIDE_OF_LOOP_COST (stmt_info) * factor;