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Stop providing branch prediction information

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The __builtin_expect() can be used to provide the compiler with branch
prediction information.  The Gcc manual says[1] on the subject:

    In general, you should prefer to use actual profile feedback for
    this (-fprofile-arcs), as programmers are notoriously bad at
    predicting how their programs actually perform.

Stop using __builtin_expect() and ISC_LIKELY() and ISC_UNLIKELY() macros
to provide the branch prediction information as the performance testing
shows that named performs better when the __builtin_expect() is not
being used.

1. https://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html#index-_005f_005fbuiltin_005fexpect
This commit is contained in:
Ondřej Surý
2021-10-14 10:33:24 +02:00
parent 80fedf9231
commit e603983ec9
25 changed files with 114 additions and 180 deletions
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util/copyrights
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@@ -1654,7 +1654,6 @@
./lib/isc/include/isc/iterated_hash.h C 2008,2014,2016,2018,2019,2020,2021
./lib/isc/include/isc/lang.h C 1999,2000,2001,2004,2005,2006,2007,2016,2018,2019,2020,2021
./lib/isc/include/isc/lex.h C 1998,1999,2000,2001,2002,2004,2005,2007,2008,2015,2016,2017,2018,2019,2020,2021
./lib/isc/include/isc/likely.h C 2017,2018,2019,2020,2021
./lib/isc/include/isc/list.h C 1997,1998,1999,2000,2001,2002,2004,2006,2007,2011,2012,2013,2016,2018,2019,2020,2021
./lib/isc/include/isc/log.h C 1999,2000,2001,2002,2004,2005,2006,2007,2009,2014,2016,2017,2018,2019,2020,2021
./lib/isc/include/isc/magic.h C 1999,2000,2001,2004,2005,2006,2007,2016,2017,2018,2019,2020,2021