[ARC] Update mode_dependent_address_p hook.

Update arc_mode_dependent_address_p to avoid emitting subreg(mem (reg
..)) when expanding by relaxing the conditions.

gcc/
2017-04-14  Claudiu Zissulescu  <claziss@synopsys.com>

	* config/arc/arc.c (arc_mode_dependent_address_p): Relax
	conditions to take advantage of various optimizations.

From-SVN: r246925

gcc/ChangeLog

+2017-04-14  Claudiu Zissulescu  <claziss@synopsys.com>
+
+	* config/arc/arc.c (arc_mode_dependent_address_p): Relax
+	conditions to take advantage of various optimizations.
+
 2017-04-13  Jeff Law  <law@redhat.com>
 
 	* config/mips.mips.md (zero_extendsidi2): Do not allow SP to appear

gcc/config/arc/arc.c

@@ -5509,13 +5509,9 @@ arc_mode_dependent_address_p (const_rtx addr, addr_space_t)
 {
   /* SYMBOL_REF is not mode dependent: it is either a small data reference,
      which is valid for loads and stores, or a limm offset, which is valid for
-     loads.  */
-  /* Scaled indices are scaled by the access mode; likewise for scaled
-     offsets, which are needed for maximum offset stores.  */
+     loads.  Scaled indices are scaled by the access mode.  */
   if (GET_CODE (addr) == PLUS
-      && (GET_CODE (XEXP ((addr), 0)) == MULT
-	  || (CONST_INT_P (XEXP ((addr), 1))
-	      && !SMALL_INT (INTVAL (XEXP ((addr), 1))))))
+      && GET_CODE (XEXP ((addr), 0)) == MULT)
     return true;
   return false;
 }