[PATCH] aarch64: MTE compatible strrchr

Szabolcs Nagy szabolcs.nagy@arm.com
Tue Jun 23 16:58:41 GMT 2020


The 06/09/2020 16:09, Alex Butler wrote:
> Add support for MTE to strrchr. Regression tested with xcheck and benchmarked
> with glibc's benchtests on the Cortex-A53, Cortex-A72, and Neoverse N1.
> 
> The existing implementation assumes that any access to the pages in which the
> string resides is safe. This assumption is not true when MTE is enabled. This
> patch updates the algorithm to ensure that accesses remain within the bounds
> of an MTE tag (16-byte chunks) and improves overall performance.
> 
> Co-authored-by: Wilco Dijkstra <wilco.dijkstra@arm.com>

thanks, committed.


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