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Re: [PATCH v2] aarch64: Optimized implementation of strnlen
- From: Adhemerval Zanella <adhemerval dot zanella at linaro dot org>
- To: libc-alpha at sourceware dot org
- Date: Thu, 19 Dec 2019 16:44:54 -0300
- Subject: Re: [PATCH v2] aarch64: Optimized implementation of strnlen
- References: <20191022094003.9612-1-zhangxuelei4@huawei.com> <VI1PR0801MB2127371656BDA0AC49975A0183680@VI1PR0801MB2127.eurprd08.prod.outlook.com>
On 22/10/2019 14:57, Wilco Dijkstra wrote:
> Hi Xuelei,
>
>> Optimize the strlen implementation by using vector operations and
>> loop unrooling in main loop. Compared to aarch64/strnlen.S, it
>> reduces latency of cases in bench-strnlen by 11%~24% when the length
>> of src is greater than 64 bytes, with gains throughout the benchmark.
>
> Like with strcpy, this improves performance on various microarchitectures,
> so this is OK.
>
> Wilco
I pushed it upstream.