fix pr 46571: ia64 bootstrap compare failure

diff --git a/gcc/gcse.c b/gcc/gcse.c
index 595fdb2..9ff0da8 100644
--- a/gcc/gcse.c
+++ b/gcc/gcse.c
@@ -1460,7 +1460,7 @@  hash_scan_set (rtx pat, rtx insn, struct hash_table_d *table)
 		  modified.  Here we want to search from INSN+1 on, but
 		  oprs_available_p searches from INSN on.  */
 	       && (insn == BB_END (BLOCK_FOR_INSN (insn))
-		   || (tmp = next_nonnote_insn (insn)) == NULL_RTX
+		   || (tmp = next_nonnote_nondebug_insn (insn)) == NULL_RTX
 		   || BLOCK_FOR_INSN (tmp) != BLOCK_FOR_INSN (insn)
 		   || oprs_available_p (pat, tmp)))
 	insert_set_in_table (pat, insn, table);
@@ -1748,7 +1748,7 @@  compute_hash_table_work (struct hash_table_d *table)
 	 determine when registers and memory are first and last set.  */
       FOR_BB_INSNS (current_bb, insn)
 	{
-	  if (! INSN_P (insn))
+	  if (!NONDEBUG_INSN_P (insn))
 	    continue;
 
 	  if (CALL_P (insn))
@@ -1771,7 +1771,7 @@  compute_hash_table_work (struct hash_table_d *table)
 
       /* The next pass builds the hash table.  */
       FOR_BB_INSNS (current_bb, insn)
-	if (INSN_P (insn))
+	if (NONDEBUG_INSN_P (insn))
 	  hash_scan_insn (insn, table);
     }
 
diff --git a/gcc/testsuite/gcc.dg/pr46571.c b/gcc/testsuite/gcc.dg/pr46571.c
new file mode 100644
index 0000000..ac55f49
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr46571.c
@@ -0,0 +1,122 @@ 
+/* { dg-do compile } */
+/* { dg-options "-O2 -fcompare-debug" } */
+
+typedef union tree_node *tree;
+typedef unsigned int source_location;
+enum tree_code
+{
+  MINUS_EXPR,
+  MULT_EXPR,
+};
+struct tree_omp_clause
+{
+  union omp_clause_subcode
+  {
+    enum tree_code reduction_code;
+  } subcode;
+};
+union tree_node
+{
+  struct tree_omp_clause omp_clause;
+};
+enum tree_index
+{
+  TI_ERROR_MARK,
+};
+typedef struct
+{
+  unsigned allocatable:1;
+  unsigned dimension:1;
+  unsigned codimension:1;
+  unsigned external:1;
+  unsigned optional:1;
+  unsigned pointer:1;
+  unsigned contiguous:1;
+  unsigned referenced:1;
+} symbol_attribute;
+typedef unsigned int gfc_char_t;
+typedef struct gfc_linebuf
+{
+  source_location location;
+} gfc_linebuf;
+typedef struct
+{
+  gfc_char_t *nextc;
+  gfc_linebuf *lb;
+} locus;
+typedef struct
+{
+  struct gfc_symbol *sym;
+  struct gfc_namelist *next;
+} gfc_namelist;
+enum
+{
+  OMP_LIST_PLUS,
+  OMP_LIST_REDUCTION_FIRST = OMP_LIST_PLUS,
+  OMP_LIST_MULT,
+  OMP_LIST_SUB,
+  OMP_LIST_NUM
+};
+typedef struct gfc_omp_clauses
+{
+  gfc_namelist *lists[OMP_LIST_NUM];
+} gfc_omp_clauses;
+typedef struct gfc_symbol
+{
+  symbol_attribute attr;
+} gfc_symbol;
+typedef struct gfc_code
+{
+  locus loc;
+  union
+  {
+    gfc_omp_clauses *omp_clauses;
+  } ext;
+} gfc_code;
+typedef struct
+{
+} stmtblock_t;
+
+static tree
+gfc_trans_omp_reduction_list (gfc_namelist * namelist, tree list,
+			      enum tree_code reduction_code, locus where)
+{
+  for (; namelist != ((void *) 0); namelist = namelist->next)
+    if (namelist->sym->attr.referenced)
+      {
+	tree node = build_omp_clause (where.lb->location);
+	node->omp_clause.subcode.reduction_code = reduction_code;
+	gfc_trans_omp_array_reduction (namelist->sym, where);
+      }
+}
+
+static tree
+gfc_trans_omp_clauses (stmtblock_t * block, gfc_omp_clauses * clauses,
+		       locus where)
+{
+  tree omp_clauses = (tree) ((void *) 0);
+  int list;
+  for (list = 0; list < OMP_LIST_NUM; list++)
+    {
+      gfc_namelist *n = clauses->lists[list];
+      enum tree_code reduction_code;
+      if (n == ((void *) 0))
+	continue;
+      switch (list)
+	{
+	case OMP_LIST_MULT:
+	  reduction_code = MULT_EXPR;
+	  break;
+	case OMP_LIST_SUB:
+	  reduction_code = MINUS_EXPR;
+	}
+      gfc_trans_omp_reduction_list (n, omp_clauses, reduction_code, where);
+    }
+}
+
+void
+gfc_trans_omp_parallel_workshare (gfc_code * code)
+{
+  stmtblock_t block;
+  gfc_trans_omp_clauses (&block, code->ext.omp_clauses, code->loc);
+}