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| author | Xuelei Zhang <zhangxuelei4@huawei.com> | 2019-12-19 15:26:33 +0000 |
|---|---|---|
| committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2019-12-19 16:31:04 -0300 |
| commit | 525de033a9d19bc79ce353745d14927a793dd4e8 (patch) | |
| tree | 8c12f0bd8573525387a8ecbdd447f0347c7894c3 /sysdeps/aarch64/multiarch/ifunc-impl-list.c | |
| parent | c2150769d015dca1805334af7743829f1e4c0b6a (diff) | |
| download | glibc-525de033a9d19bc79ce353745d14927a793dd4e8.tar.gz glibc-525de033a9d19bc79ce353745d14927a793dd4e8.tar.xz glibc-525de033a9d19bc79ce353745d14927a793dd4e8.zip | |
aarch64: Optimized memset for Kunpeng processor.
Due to the branch prediction issue of Kunpeng processor, we found memset_generic has poor performance on middle sizes setting, and so we reconstructed the logic, expanded the loop by 4 times in set_long to solve the problem, even when setting below 1K sizes have benefit. Another change is that DZ_ZVA seems no work when setting zero, so we discarded it and used set_long to set zero instead. Fewer branches and predictions also make the zero case have slightly improvement. Checked on aarch64-linux-gnu. Reviewed-by: Wilco Dijkstra <Wilco.Dijkstra@arm.com>
Diffstat (limited to 'sysdeps/aarch64/multiarch/ifunc-impl-list.c')
| -rw-r--r-- | sysdeps/aarch64/multiarch/ifunc-impl-list.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/sysdeps/aarch64/multiarch/ifunc-impl-list.c b/sysdeps/aarch64/multiarch/ifunc-impl-list.c index be13b916e5..bcbd90d0c4 100644 --- a/sysdeps/aarch64/multiarch/ifunc-impl-list.c +++ b/sysdeps/aarch64/multiarch/ifunc-impl-list.c @@ -53,6 +53,7 @@ __libc_ifunc_impl_list (const char *name, struct libc_ifunc_impl *array, can do a comparative analysis with __memset_generic. */ IFUNC_IMPL_ADD (array, i, memset, (zva_size == 64), __memset_falkor) IFUNC_IMPL_ADD (array, i, memset, (zva_size == 64), __memset_emag) + IFUNC_IMPL_ADD (array, i, memset, 1, __memset_kunpeng) IFUNC_IMPL_ADD (array, i, memset, 1, __memset_generic)) IFUNC_IMPL (i, name, memchr, IFUNC_IMPL_ADD (array, i, memchr, 1, __memchr_nosimd) |