re PR target/28115 (possible bug in recog_memoized usage in rs6000.c??)

PR target/28115
* config/rs6000/rs6000.c (rs6000_adjust_cost): Correct
recog_memoized test for insn and check recog_memoized for dep_insn.

From-SVN: r231045

gcc/ChangeLog

+2015-11-29  David Edelsohn  <dje.gcc@gmail.com>
+
+	PR target/28115
+	* config/rs6000/rs6000.c (rs6000_adjust_cost): Correct
+	recog_memoized test for insn and check recog_memoized for dep_insn.
+
 2015-11-28  Nathan Sidwell  <nathan@acm.org>
 
 	* config/nvptx/nvptx.h (FIRST_PARM_OFFSET): Add void cast.

gcc/config/rs6000/rs6000.c

@@ -28544,8 +28544,8 @@ rs6000_adjust_cost (rtx_insn *insn, rtx link, rtx_insn *dep_insn, int cost)
 {
   enum attr_type attr_type;
 
-  if (! recog_memoized (insn))
-    return 0;
+  if (recog_memoized (insn) < 0 || recog_memoized (dep_insn) < 0)
+    return cost;
 
   switch (REG_NOTE_KIND (link))
     {