diff options
| author | Michael Meissner <meissner@linux.ibm.com> | 2022-07-14 11:16:08 -0400 |
|---|---|---|
| committer | Michael Meissner <meissner@linux.ibm.com> | 2022-07-14 11:16:08 -0400 |
| commit | 22736f3d0d4fb8ce4afb3230023f8accdb03a623 (patch) | |
| tree | 6e65f968dcdf2843018b85fd14d427e965e25cc6 /gcc | |
| parent | 0380d008b1474373852fd2fc921886491304f854 (diff) | |
[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 <meissner@linux.ibm.com>
gcc/
* config/rs6000/rs6000.cc (rs6000_option_override_internal): Do
not generate block copies with vector pair instructions if we are
tuning for power10. Back port from master branch.
Diffstat (limited to 'gcc')
| -rw-r--r-- | gcc/config/rs6000/rs6000.cc | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/gcc/config/rs6000/rs6000.cc b/gcc/config/rs6000/rs6000.cc index 4030864aa1a..040487bd277 100644 --- a/gcc/config/rs6000/rs6000.cc +++ b/gcc/config/rs6000/rs6000.cc @@ -4151,7 +4151,10 @@ 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; |