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On Apr 5 13:39, Prakhar Bahuguna wrote: > This patch provides an optimised implementation of memchr using NEON > instructions to improve its performance, especially with longer search regions. > This gave at least double the performance against the Thumb2+DSP optimised code, > with as much as quadruple performance for larger inputs. The NEON code also wins > in cases where the input is small (less than 8 bytes) by defaulting to a simple > byte-by-byte search. This avoids the overhead imposed by filling two quadword > registers from memory. > > newlib/ChangeLog: > > 2017-01-26 Prakhar Bahuguna <prakhar.bahuguna@arm.com> > > * newlib/libc/machine/arm/memchr-stub.c: Add __ARM_NEON__ ifdef. > Change if to elif. > * newlib/libc/machine/arm/memchr.S: Add __ARM_NEON__ ifdef. > Add NEON-optimised memchr implementation. > Change if to elif. > > Testing done: Ran regression tests for arm-eabi-none, and benchmark tests on > hardware. > > Okay for master? Applied. Thanks, Corinna -- Corinna Vinschen Cygwin Maintainer Red Hat
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