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AArch64: Optimize memset
authorWilco Dijkstra <wilco.dijkstra@arm.com>
Mon, 9 Sep 2024 14:26:47 +0000 (15:26 +0100)
committerWilco Dijkstra <wilco.dijkstra@arm.com>
Fri, 28 Feb 2025 14:22:28 +0000 (14:22 +0000)
commit544fb349d35efd5f86ed7e482759ff21496a32fd
tree2d3167966bc61d3d3bccc62a6113847bd4895903tree
parent64896b7d329809127035fde42768a6f7eeffed75commit | diff
AArch64: Optimize memset

Improve small memsets by avoiding branches and use overlapping stores.
Use DC ZVA for copies over 128 bytes.  Remove unnecessary code for ZVA sizes
other than 64 and 128.  Performance of random memset benchmark improves by 24%
on Neoverse N1.

Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
(cherry picked from commit cec3aef32412779e207f825db0d057ebb4628ae8)
sysdeps/aarch64/memset.S diff | blob | blame | history
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