Profile guided and string routines?

[David Gilbert]

Does anyone have any experience of what can be profiled in the profiled
guided optimisations?

One of the problems with some of the string routines is that you can write
pretty neat fast routines that
work well for long strings - but most of the calls actually pass short
strings and the overhead of the
fast routine means that for most cases you are slower than you would have
been with a simple routine.

If Profile Guiding could spot that a particular callsite to say strlen() was
often associated with strings
of at least 'n' characters we could call a different implementation.

Dave
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