Index: genattrtab.c
===================================================================
--- genattrtab.c	(revision 296735)
+++ genattrtab.c	(working copy)
@@ -1932,6 +1932,36 @@ evaluate_eq_attr (rtx exp, rtx value, in
   rtx newexp;
   int i;
 
+  while (GET_CODE (value) == ATTR)
+    {
+      struct attr_desc *attr;
+      struct attr_value *av = NULL;
+
+      attr = find_attr (&XSTR (value, 0), 0);
+      if (insn_code_values)
+	{
+	  struct attr_value_list *iv;
+	  for (iv = insn_code_values[insn_code]; iv; iv = iv->next)
+	    if (iv->attr == attr)
+	      {
+		av = iv->av;
+		break;
+	      }
+	}
+      else
+	{
+	  struct insn_ent *ie;
+	  for (av = attr->first_value; av; av = av->next)
+	    for (ie = av->first_insn; ie; ie = ie->next)
+	      if (ie->def->insn_code == insn_code)
+		goto got_av;
+	}
+      if (av)
+	{
+	got_av:
+	  value = av->value;
+	}
+    }
   switch (GET_CODE (value))
     {
     case CONST_STRING: