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[AArch64] Add strchr optimized implementation.


This patch adds a hand-optimized assembly routine for strchr.  It makes
heavy use of Neon, permitting strings to be searched in chunks of 32
bytes at a time.  Benchmarking on Cortex-A57 suggests that this is very
rarely slower than a 'good' C implementation, but can be up to 3.5 times
as fast.

Because we use LD1 for fetching bytes from memory, there's no difference
between big-endian and little-endian code.

2014-06-10  Richard Earnshaw  <rearnsha@arm.com>

	* libc/machine/aarch64/strchr.S: New file
	* libc/machine/aarch64/strchr-stub.c: New file
	* libc/machine/aarch64/Makefile.am: Add them to build list.
	* libc/machine/aarch64/Makefile.in: Regenerated.

Committed.

R.

Attachment: strchr.patch
Description: Text document


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