Powerpc bootstrap failure due to duplicate case value

	PR target/79098
	* config/rs6000/rs6000.c (rs6000_legitimate_combined_insn): Don't
	use a switch.

From-SVN: r244489

gcc/ChangeLog

+2017-01-16  Alan Modra  <amodra@gmail.com>
+
+	PR target/79098
+	* config/rs6000/rs6000.c (rs6000_legitimate_combined_insn): Don't
+	use a switch.
+
 2017-01-16  Georg-Johann Lay  <avr@gjlay.de>
 
 	* config/avr/avr.h (BRANCH_COST) [reload_completed]: Increase by 4.

gcc/config/rs6000/rs6000.c

@@ -9085,8 +9085,8 @@ rs6000_const_not_ok_for_debug_p (rtx x)
 static bool
 rs6000_legitimate_combined_insn (rtx_insn *insn)
 {
-  switch (INSN_CODE (insn))
-    {
+  int icode = INSN_CODE (insn);
+
   /* Reject creating doloop insns.  Combine should not be allowed
      to create these for a number of reasons:
      1) In a nested loop, if combine creates one of these in an
@@ -9109,16 +9109,17 @@ rs6000_legitimate_combined_insn (rtx_insn *insn)
      a gpr to fpr.  See PR70098 and PR71763 which are not fixed
      for the difficult case.  It's better to not create problems
      in the first place.  */
-    case CODE_FOR_ctrsi_internal1:
-    case CODE_FOR_ctrdi_internal1:
-    case CODE_FOR_ctrsi_internal2:
-    case CODE_FOR_ctrdi_internal2:
-    case CODE_FOR_ctrsi_internal3:
-    case CODE_FOR_ctrdi_internal3:
-    case CODE_FOR_ctrsi_internal4:
-    case CODE_FOR_ctrdi_internal4:
+  if (icode != CODE_FOR_nothing
+      && (icode == CODE_FOR_ctrsi_internal1
+	  || icode == CODE_FOR_ctrdi_internal1
+	  || icode == CODE_FOR_ctrsi_internal2
+	  || icode == CODE_FOR_ctrdi_internal2
+	  || icode == CODE_FOR_ctrsi_internal3
+	  || icode == CODE_FOR_ctrdi_internal3
+	  || icode == CODE_FOR_ctrsi_internal4
+	  || icode == CODE_FOR_ctrdi_internal4))
     return false;
-    }
+
   return true;
 }