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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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