Contributing to the glibc Project

[Joseph Myers]

On Thu, 13 Oct 2016, Adhemerval Zanella wrote:

> For strlen we do have an armv6, armv6 thumb2, and the default one
> which should work on minimum supported arm (armv5?).

Minimum is v4 (though anything less than v4t may not work well with the 
EABI).

> Also note that for armv7+ we use ifunc to select of different
> implementation for memcpy. One possible work I would suggest you
> and use the memcpy* for amrv7 and create also a multiarch memmove
> implementation based on current armv7 strategies, since armv7 
> still uses the default memmove.S implementation.

Note that any string function patches motivated by performance need 
thorough before-and-after benchmarking to justify that they are 
improvements for the affected processors.  In addition to running the 
glibc testsuite of course - and for processors such as ARM that support 
both endiannesses, string tests need running for both endiannesses.

-- 
Joseph S. Myers
joseph@codesourcery.com