regclass.c (regclass): Use SECONDARY_RELOAD_CLASS if it's defined to avoid useless work.

        * regclass.c (regclass): Use SECONDARY_RELOAD_CLASS if it's
        defined to avoid useless work.

        * combine.c (find_split_point): Try to split SET_DEST
        just like we do for SET_SRC.

From-SVN: r10790

gcc/combine.c

@@ -2542,6 +2542,11 @@ find_split_point (loc, insn)
       if (split && split != &SET_SRC (x))
 	return split;
 
+      /* See if we can split SET_DEST as it stands.  */
+      split = find_split_point (&SET_DEST (x), insn);
+      if (split && split != &SET_DEST (x))
+	return split;
+
       /* See if this is a bitfield assignment with everything constant.  If
 	 so, this is an IOR of an AND, so split it into that.  */
       if (GET_CODE (SET_DEST (x)) == ZERO_EXTRACT

gcc/regclass.c

@@ -674,6 +674,10 @@ regclass (f, nregs)
 		     being used in such addresses.  */
 
 		  if ((0
+#ifdef SECONDARY_RELOAD_CLASS
+		       || (SECONDARY_RELOAD_CLASS (BASE_REG_CLASS, m, r)
+			   != NO_REGS)
+#else
 #ifdef SECONDARY_INPUT_RELOAD_CLASS
 		       || (SECONDARY_INPUT_RELOAD_CLASS (BASE_REG_CLASS, m, r)
 			   != NO_REGS)
@@ -682,6 +686,7 @@ regclass (f, nregs)
 		       || (SECONDARY_OUTPUT_RELOAD_CLASS (BASE_REG_CLASS, m, r)
 			   != NO_REGS)
 #endif
+#endif
 		       )
 		      && ! auto_inc_dec_reg_p (r, m))
 		    forbidden_inc_dec_class[i] = 1;