| commit | 4a733bf375238a6a595033b5785cea7f27d61307 | |
| author | Wilco Dijkstra <wdijkstr@arm.com> | |
| Wed, 15 Jul 2020 15:55:07 +0000 (15 16:55 +0100) | ||
| committer | Wilco Dijkstra <wdijkstr@arm.com> | |
| Wed, 15 Jul 2020 15:55:07 +0000 (15 16:55 +0100) | ||
| tree | e649148bc3df2bf6ce1d256b5d9c8dc6d70b4195 | treesnapshot (tar.gz zip) |
| parent | 34f0d01d5e43c7dedd002ab47f6266dfb5b79c22 | commitdiff |
AArch64: Add optimized Q-register memcpy
Add a new memcpy using 128-bit Q registers - this is faster on modern
cores and reduces codesize. Similar to the generic memcpy, small cases
include copies up to 32 bytes. 64-128 byte copies are split into two
cases to improve performance of 64-96 byte copies. Large copies align
the source rather than the destination.
bench-memcpy-random is ~9% faster than memcpy_falkor on Neoverse N1,
so make this memcpy the default on N1 (on Centriq it is 15% faster than
memcpy_falkor).
Passes GLIBC regression tests.
Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
Add a new memcpy using 128-bit Q registers - this is faster on modern
cores and reduces codesize. Similar to the generic memcpy, small cases
include copies up to 32 bytes. 64-128 byte copies are split into two
cases to improve performance of 64-96 byte copies. Large copies align
the source rather than the destination.
bench-memcpy-random is ~9% faster than memcpy_falkor on Neoverse N1,
so make this memcpy the default on N1 (on Centriq it is 15% faster than
memcpy_falkor).
Passes GLIBC regression tests.
Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>