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There finally is a way to support register pairs on aarch64 assembly under gcc, it's just undocumented, like many of the options there :-( As indicated below, it's possible to pass "%H" to mention the high part of a register pair (e.g. "%H0" to go with "%0"): https://patchwork.ozlabs.org/project/gcc/patch/59368A74.2060908@foss.arm.com/ By making local variables from pairs of registers via a struct (as is used in IST for example), we can let gcc choose the correct register pairs and avoid a few moves in certain situations. The code is now slightly more efficient than the previous one on AWS' Graviton2 platform, and noticeably smaller (by 4.5kB approx). A few tests on older releases show that even Linaro's gcc-4.7 used to support such register pairs and %H, and by then ATOMICS were not supported so this should not cause build issues, and as such this patch replaces the earlier implementation. |
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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)