https://bugs.exim.org/show_bug.cgi?id=2430
--- Comment #8 from Andreas Bergmann <andreas.bergmann@???> ---
Just for the records: Using gcc 6.3.0 with '-O2' optimizations in my test case,
the loop is still the faster option. However, applying that patch (being
targeted at overall performance) also solves the issue. So 'case closed',
thanks a lot.
while-loop:
1048576 bytes 0.000049 sec (?i)abc
1048576 bytes 0.000141 sec (a|A)(b|B)(c|C)
1048576 bytes 0.000103 sec [aA][bB][cC]
1048576 bytes 0.000033 sec abc
memchr+patch:
1048576 bytes 0.000095 sec (?i)abc
1048576 bytes 0.000144 sec (a|A)(b|B)(c|C)
1048576 bytes 0.000107 sec [aA][bB][cC]
1048576 bytes 0.000033 sec abc
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