------- You are receiving this mail because: ------- You are on the CC list for the bug.
http://bugs.exim.org/show_bug.cgi?id=1419 --- Comment #13 from Ben Maurer <[email protected]> 2013-12-15 18:25:41 --- Just to be clear, I work for Facebook and put up the bounty. My criteria here would be to get the 5288 ms time down an order of magnitude -- 500 ms would be a good threshold (though I'm open to hearing any reasons that number isn't possible). Even if you're not interested in the bounty, we'd be happy to find something to do with it after these improvements are made. As to how to optimize that loop with SSE, the SSE 4.2 instructions can't easily do the check you listed on an aribtrary bitmask. However, they can handle masks with: - Up to 16 characters set - 8 continuous ranges of characters - Any negation of the above. This would handle many common regexes. For example [a-zA-Z0-9] would use the equal ranges. http://halobates.de/pcmpstr-js/pcmp.html has an example of writing strspn with sse 4.2 instructions. http://repo.or.cz/w/glibc.git/blob?f=sysdeps/x86_64/multiarch/strspn-c.c has the actual glibc implementation of strspn. -- Configure bugmail: http://bugs.exim.org/userprefs.cgi?tab=email -- ## List details at https://lists.exim.org/mailman/listinfo/pcre-dev
