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authorWilco Dijkstra <wdijkstr@arm.com>2016-12-14 15:12:18 +0000
committerWilco Dijkstra <wdijkstr@arm.com>2016-12-14 15:12:18 +0000
commitd58ab810a6e325cc351684d174c48cabce01bcc1 (patch)
tree52a582dd886d5931988c3a6e2d1acd79efe2fe33 /ChangeLog.12
parent14348aaeff5ccb136e3fe967b86f97b9cea950a2 (diff)
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Improve strtok and strtok_r performance. Instead of calling strpbrk which
calls strcspn, call strcspn directly so we get the end of the token without
an extra call to rawmemchr.  Also avoid an unnecessary call to strcspn after
the last token by adding an early exit for an empty string.  Change strtok
to tailcall strtok_r to avoid unnecessary code duplication.

Remove the special header optimization for strtok_r of a 1-character
constant string - both strspn and strcspn contain optimizations for this
case.  Benchmarking this showed similar performance in the worst case,
but up to 5.5x better performance in the "found" case for large inputs.

	* benchtests/bench-strtok.c (oldstrtok): Add old implementation.
	* string/strtok.c (strtok): Change to tailcall __strtok_r.
	* string/strtok_r.c (__strtok_r): Optimize for performance.
	* string/string-inlines.c (__old_strtok_r_1c): New function.
	* string/bits/string2.h (__strtok_r): Move to string-inlines.c.
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