re PR tree-optimization/22506 (ICE with -ftree-vectorize in var_ann, at tree-flow-inline.h:115)

        PR tree-optimization/22506
        * tree-vectorizer.c (update_phi_nodes_for_guard2): Skip loop-closed
        phis whose argument is constant.

From-SVN: r102487

gcc/ChangeLog

+2005-07-28  Dorit Nuzman  <dorit@il.ibm.com>
+
+	PR tree-optimization/22506
+	* tree-vectorizer.c (update_phi_nodes_for_guard2): Skip loop-closed
+	phis whose argument is constant.
+
 2005-07-28  J"orn Rennecke <joern.rennecke@st.com>
 
 	PR rtl-optimization/18992

gcc/testsuite/ChangeLog

+2005-07-28  Dorit Nuzman  <dorit@il.ibm.com>
+
+	PR tree-optimization/22506
+	* gcc.dg/vect/ps22506.c: New test.
+
 2005-07-28  Jakub Jelinek  <jakub@redhat.com>
 
 	PR target/21149

gcc/testsuite/gcc.dg/vect/pr22506.c

+/* { dg-do compile } */
+/* { dg-require-effective-target vect_int } */
+
+float x[3];
+
+void foo()
+{
+    int i;
+
+    for (i=0; i<5; ++i) x[i]=0;
+    for (i=0; i<4; ++i) ;
+}

gcc/tree-vectorizer.c

@@ -640,6 +640,10 @@ slpeel_update_phi_nodes_for_guard2 (edge guard_edge, struct loop *loop,
     {
       orig_phi = update_phi;
       orig_def = PHI_ARG_DEF_FROM_EDGE (orig_phi, e);
+      /* This loop-closed-phi actually doesn't represent a use
+         out of the loop - the phi arg is a constant.  */ 
+      if (TREE_CODE (orig_def) != SSA_NAME)
+        continue;
       orig_def_new_name = get_current_def (orig_def);
       arg = NULL_TREE;