Back port patch (changing .cc to .c) from trunk to GCC 11 committed.
| From 3118d0856b030fe491a170354fed2df570df199f Mon Sep 17 00:00:00 2001
| From: Michael Meissner <meiss...@linux.ibm.com>
| Date: Thu, 14 Jul 2022 14:03:37 -0400
| Subject: [PATCH] [BACKPORT] Disable generating load/store vector pairs for
block copies.
Testing has found that using load and store vector pair for block copies
can result in a slow down on power10. This patch disables using the
vector pair instructions for block copies if we are tuning for power10.
2022-06-11 Michael Meissner <meiss...@linux.ibm.com>
gcc/
* config/rs6000/rs6000.c (rs6000_option_override_internal): Do
not generate block copies with vector pair instructions if we are
tuning for power10. Back port from master branch.
---
gcc/config/rs6000/rs6000.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c
index 8c89b45922f..73f90f134f8 100644
--- a/gcc/config/rs6000/rs6000.c
+++ b/gcc/config/rs6000/rs6000.c
@@ -4149,7 +4149,10 @@ rs6000_option_override_internal (bool global_init_p)
if (!(rs6000_isa_flags_explicit & OPTION_MASK_BLOCK_OPS_VECTOR_PAIR))
{
- if (TARGET_MMA && TARGET_EFFICIENT_UNALIGNED_VSX)
+ /* Do not generate lxvp and stxvp on power10 since there are some
+ performance issues. */
+ if (TARGET_MMA && TARGET_EFFICIENT_UNALIGNED_VSX
+ && rs6000_tune != PROCESSOR_POWER10)
rs6000_isa_flags |= OPTION_MASK_BLOCK_OPS_VECTOR_PAIR;
else
rs6000_isa_flags &= ~OPTION_MASK_BLOCK_OPS_VECTOR_PAIR;
--
2.35.3
--
Michael Meissner, IBM
PO Box 98, Ayer, Massachusetts, USA, 01432
email: meiss...@linux.ibm.com
