[Committed] S/390: Increase memory access costs

[Andreas Krebbel]

Hi,

I've committed the attached patch which fixes a 4.8 vs 4.9/5.0
performance regression introduced with the aggressive use of FPRs as
spill slots.

Committed to mainline and 4.9 branch.

Bye,

-Andreas-

2015-01-27  Andreas Krebbel  <andreas.kreb...@de.ibm.com>

        * config/s390/s390.c (s390_memory_move_cost): Increase costs for
        memory accesses.

diff --git a/gcc/config/s390/s390.c b/gcc/config/s390/s390.c
index 1409fa8..9c67157 100644
--- a/gcc/config/s390/s390.c
+++ b/gcc/config/s390/s390.c
@@ -2434,7 +2434,7 @@ s390_memory_move_cost (machine_mode mode ATTRIBUTE_UNUSED,
                       reg_class_t rclass ATTRIBUTE_UNUSED,
                       bool in ATTRIBUTE_UNUSED)
 {
-  return 1;
+  return 2;
 }
 
 /* Compute a (partial) cost for rtx X.  Return true if the complete