[Committed] S/390: Adjust register move costs for z10 or higher

[Andreas Krebbel]

Hi,

I've committed the attached patch.  With z10 introduction of ldgr and
lgdr I've adjusted SECONDARY_MEMORY_NEEDED but forgot about the
GPR-FPR reg move cost hook.

Comitted after testing on s390x and s390 (-march=zEC12).

Bye,

-Andreas-


2013-05-15  Andreas Krebbel  <andreas.kreb...@de.ibm.com>

        * config/s390/s390.c (s390_register_move_cost): Don't impose the
        FPR<->GPR move cost penalty if ldgr/lgdr can be used.

---
 gcc/config/s390/s390.c |   12 !!!!!!!!!!!!
 1 file changed, 12 modifications(!)

Index: gcc/config/s390/s390.c
===================================================================
*** gcc/config/s390/s390.c.orig
--- gcc/config/s390/s390.c
*************** static int
*** 2432,2442 ****
  s390_register_move_cost (enum machine_mode mode ATTRIBUTE_UNUSED,
                           reg_class_t from, reg_class_t to)
  {
! /* On s390, copy between fprs and gprs is expensive.  */
!   if ((reg_classes_intersect_p (from, GENERAL_REGS)
!        && reg_classes_intersect_p (to, FP_REGS))
!       || (reg_classes_intersect_p (from, FP_REGS)
!         && reg_classes_intersect_p (to, GENERAL_REGS)))
      return 10;
  
    return 1;
--- 2432,2444 ----
  s390_register_move_cost (enum machine_mode mode ATTRIBUTE_UNUSED,
                           reg_class_t from, reg_class_t to)
  {
!   /* On s390, copy between fprs and gprs is expensive as long as no
!      ldgr/lgdr can be used.  */
!   if ((!TARGET_Z10 || GET_MODE_SIZE (mode) != 8)
!       && ((reg_classes_intersect_p (from, GENERAL_REGS)
!          && reg_classes_intersect_p (to, FP_REGS))
!         || (reg_classes_intersect_p (from, FP_REGS)
!             && reg_classes_intersect_p (to, GENERAL_REGS))))
      return 10;
  
    return 1;