combine.c (find_split_point): Verify that the shift count is a constant when...

       * combine.c (find_split_point): Verify that the shift count is a
       constant when choosing (plus (ashift ...)) as a split point.

From-SVN: r223736

gcc/ChangeLog

 2015-05-26  Jeff Law  <law@redhat.com>
 
+	* combine.c (find_split_point): Verify that the shift count is a
+	constant when choosing (plus (ashift ...)) as a split point.
+
 	* tree-ssa-threadupdate.c: Replace 8 space sequences with tabs.
 	No functional changes.
 

gcc/combine.c

@@ -5157,7 +5157,8 @@ find_split_point (rtx *loc, rtx_insn *insn, bool set_src)
          worthless to try this split.  */
       if (!set_src
 	  && (GET_CODE (XEXP (x, 0)) == MULT
-	      || GET_CODE (XEXP (x, 0)) == ASHIFT))
+	      || (GET_CODE (XEXP (x, 0)) == ASHIFT
+		  && GET_CODE (XEXP (XEXP (x, 0), 1)) == CONST_INT)))
         return loc;
 
     default: