S/390: Increase register move costs for CC_REGS

This increases the move costs for moves involving the CC
register which saves us some instructions in SPEC CPU2006.

gcc/ChangeLog:

2018-11-05  Robin Dapp  <rdapp@linux.ibm.com>

	* config/s390/s390.c (s390_register_move_cost): Increase costs for
        moves involving the CC reg.

From-SVN: r265814

gcc/ChangeLog

+2018-11-05  Robin Dapp  <rdapp@linux.ibm.com>
+
+	* config/s390/s390.c (s390_register_move_cost): Increase costs for
+        moves involving the CC reg.
+
 2018-11-05  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/87873

gcc/config/s390/s390.c

@@ -3416,6 +3416,11 @@ s390_register_move_cost (machine_mode mode,
 	  && reg_classes_intersect_p (to, GENERAL_REGS)))
     return 10;
 
+  /* We usually do not want to copy via CC.  */
+  if (reg_classes_intersect_p (from, CC_REGS)
+       || reg_classes_intersect_p (to, CC_REGS))
+    return 5;
+
   return 1;
 }