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config PCRE2_JIT_ENABLED
bool
depends on PACKAGE_libpcre2 && (aarch64 || aarch64_be || arm || i386 || i686 || x86_64 || mips || mipsel || mips64 || mips64el || powerpc || powerpc64 || powerpcle || sparc)
default y if (arm || i686 || x86_64)
prompt "Enable JIT compiler support"
help
Enable JIT (Just-In-Time) compiler support.
Just-in-time compiling is a heavyweight optimization that can greatly
speed up pattern matching. However, it comes at the cost of extra
processing before the match is performed, so it is of most benefit when
the same pattern is going to be matched many times. This does not
necessarily mean many calls of a matching function; if the pattern is
not anchored, matching attempts may take place many times at various
positions in the subject, even for a single call. Therefore, if the
subject string is very long, it may still pay to use JIT even for
one-off matches. JIT support is available for all of the 8-bit, 16-bit
and 32-bit PCRE2 libraries and adds about 100KB to the resulting
libpcre2.so. JIT support applies only to the traditional Perl-compatible
matching function. It does not apply when the DFA matching function is
being used.
Enabling this option can give an about 10x performance increase on JIT
operations. It can be desireable for e.g. high performance Apache
mod_rewrite or HA-Proxy reqrep operations.
However, JIT should _only_ be enabled on architectures that are supported.
Enabling JIT on unsupported platforms will result in a compilation
failure. A list of supported architectures can be found here:
https://pcre.org/current/doc/html/pcre2jit.html#SEC2
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