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As reported in issue #596, the edx register isn't marked as clobbered in div64_32(), which could technically allow gcc to try to reuse it if it needed a copy of the 32 highest bits of the o1 register after the operation. Two attempts were tried, one using a dummy 32-bit local variable to store the intermediary edx and another one switching to "=A" and making result a long long. It turns out the former makes the resulting object code significantly dirtier while the latter makes it better and was kept. This is due to gcc's difficulties at working with register pairs mixing 32- and 64- bit values on i386. It was verified that no code change happened at all on x86_64, armv7, aarch64 nor mips32. In practice it's only used by the frequency counters so this bug cannot even be triggered but better fix it. This may be backported to stable branches though it will not fix any issue.
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)