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| author | Stefan Schulze Frielinghaus <stefansf@gcc.gnu.org> | 2025-07-17 12:44:06 +0200 |
|---|---|---|
| committer | Stefan Schulze Frielinghaus <stefansf@gcc.gnu.org> | 2025-07-17 12:44:06 +0200 |
| commit | df20aac4c6662ef58e7577501ca9bb3c8d4ae507 (patch) | |
| tree | bab271fc582c5039c22df0d56822a8d86bfa2fe7 /gcc | |
| parent | c66760923188f630fbeb68c22ac521d2f4cae645 (diff) | |
| download | gcc-df20aac4c6662ef58e7577501ca9bb3c8d4ae507.zip gcc-df20aac4c6662ef58e7577501ca9bb3c8d4ae507.tar.gz gcc-df20aac4c6662ef58e7577501ca9bb3c8d4ae507.tar.bz2 | |
s390: Adapt GPR<->VR costs
Moving between GPRs and VRs in any mode with size less than or equal to
8 bytes becomes available with vector extensions. Without adapting
costs for those loads, we typically go over memory.
gcc/ChangeLog:
* config/s390/s390.cc (s390_register_move_cost): Add costing for
vlvg/vlgv.
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/config/s390/s390.cc | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/gcc/config/s390/s390.cc b/gcc/config/s390/s390.cc index 737b176..b5e636c 100644 --- a/gcc/config/s390/s390.cc +++ b/gcc/config/s390/s390.cc @@ -3862,7 +3862,21 @@ s390_register_move_cost (machine_mode mode, { /* On s390, copy between fprs and gprs is expensive. */ - /* It becomes somewhat faster having ldgr/lgdr. */ + /* With vector extensions any GPR<->VR load up to 8 bytes is supported. */ + if (TARGET_VX && GET_MODE_SIZE (mode) <= 8) + { + /* ldgr/vlvgg take one cycle and vlvg[bhf] take two cycles. */ + if (reg_classes_intersect_p (from, GENERAL_REGS) + && reg_classes_intersect_p (to, VEC_REGS)) + return GET_MODE_SIZE (mode) == 8 ? 1 : 2; + /* lgdr/vlgv[fg] take three cycles and vlgv[bh] take five cycles. */ + if (reg_classes_intersect_p (to, GENERAL_REGS) + && reg_classes_intersect_p (from, VEC_REGS)) + return GET_MODE_SIZE (mode) >= 4 ? 3 : 4; + } + + /* Without vector extensions it still becomes somewhat faster having + ldgr/lgdr. */ if (TARGET_Z10 && GET_MODE_SIZE (mode) == 8) { /* ldgr is single cycle. */ |