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| author | Michael Meissner <meissner@linux.ibm.com> | 2022-06-11 00:40:16 -0400 |
|---|---|---|
| committer | Michael Meissner <meissner@linux.ibm.com> | 2022-06-11 00:40:16 -0400 |
| commit | fddb7f65129a12dabb5ddc3c8082fe576f4af451 (patch) | |
| tree | 26dd0ddc7e3b78af4607d570e3cd56b72431ea57 | |
| parent | ef1e4d80dd30e7c46849fbb8b1ac49e672df1bbd (diff) | |
| download | gcc-fddb7f65129a12dabb5ddc3c8082fe576f4af451.zip gcc-fddb7f65129a12dabb5ddc3c8082fe576f4af451.tar.gz gcc-fddb7f65129a12dabb5ddc3c8082fe576f4af451.tar.bz2 | |
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.
| -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 0af2085..59481d9 100644 --- a/gcc/config/rs6000/rs6000.cc +++ b/gcc/config/rs6000/rs6000.cc @@ -4141,7 +4141,10 @@ 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; |