[PATCH, AArch64] Add optimized strchrnul

[Richard Earnshaw <rearnsha at arm dot com>]

Here is an optimized implementation of __strchrnul.  The simplification
that we don't have to track precisely why the loop terminates (match or
end-of-string) means we have to do less work in both setup and the core
inner loop.  That means this should never be slower than strchr.

As with strchr, the use of LD1 means we do not need different versions
for big-/little-endian.

<date>  Richard Earnshaw  <rearnsha@arm.com>

	* sysdeps/aarch64/strchrnul.S: New file.

OK?

Attachment: strchrnul-glibc.patch
Description: Text document