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We used to special-case the likely()/unlikely() macros for a series of early gcc 4.x compilers which used to produce very bad code when using __builtin_expect(x,1), which basically used to build an integer (0 or 1) from a condition then compare it to integer 1. This was already fixed in 5.x, but even now, looking at the code produced by various flavors of 4.x this bad behavior couldn't be witnessed anymore. So let's consider it as fixed by now, which will allow to get rid of some ugly tricks at some specific places. A test on 4.7.4 shows that the code shrinks by about 3kB now, thanks to some tests being inlined closer to the call place and the unlikely case being moved to real functions. See the link below for more background on this. Link: https://www.mail-archive.com/haproxy@formilux.org/msg36392.html
The HAProxy documentation has been split into a number of different files for ease of use. Please refer to the following files depending on what you're looking for : - INSTALL for instructions on how to build and install HAProxy - BRANCHES to understand the project's life cycle and what version to use - LICENSE for the project's license - CONTRIBUTING for the process to follow to submit contributions The more detailed documentation is located into the doc/ directory : - doc/intro.txt for a quick introduction on HAProxy - doc/configuration.txt for the configuration's reference manual - doc/lua.txt for the Lua's reference manual - doc/SPOE.txt for how to use the SPOE engine - doc/network-namespaces.txt for how to use network namespaces under Linux - doc/management.txt for the management guide - doc/regression-testing.txt for how to use the regression testing suite - doc/peers.txt for the peers protocol reference - doc/coding-style.txt for how to adopt HAProxy's coding style - doc/internals for developer-specific documentation (not all up to date)