lra-assigns.c: fix pseudo_compare_func

	* lra-assigns.c (pseudo_compare_func): Fix comparison step based on
	non_spilled_static_chain_regno_p.

From-SVN: r250395

gcc/ChangeLog

 2017-07-20  Alexander Monakov  <amonakov@ispras.ru>
 
+	* lra-assigns.c (pseudo_compare_func): Fix comparison step based on
+	non_spilled_static_chain_regno_p.
+
+2017-07-20  Alexander Monakov  <amonakov@ispras.ru>
+
 	* gimple-ssa-store-merging.c (sort_by_bitpos): Return 0 on equal bitpos.
 
 2017-07-20  Jan Hubicka  <hubicka@ucw.cz>

gcc/lra-assigns.c

@@ -253,10 +253,9 @@ pseudo_compare_func (const void *v1p, const void *v2p)
 
   /* Assign hard reg to static chain pointer first pseudo when
      non-local goto is used.  */
-  if (non_spilled_static_chain_regno_p (r1))
-    return -1;
-  else if (non_spilled_static_chain_regno_p (r2))
-    return 1;
+  if ((diff = (non_spilled_static_chain_regno_p (r2)
+	       - non_spilled_static_chain_regno_p (r1))) != 0)
+    return diff;
 
   /* Prefer to assign more frequently used registers first.  */
   if ((diff = lra_reg_info[r2].freq - lra_reg_info[r1].freq) != 0)