Heikki Linnakangas 025c02420d Speed up CRC calculation using slicing-by-8 algorithm. ... This speeds up WAL generation and replay. The new algorithm is significantly faster with large inputs, like full-page images or when inserting wide rows. It is slower with tiny inputs, i.e. less than 10 bytes or so, but the speedup with longer inputs more than make up for that. Even small WAL records at least have 24 byte header in the front. The output is identical to the current byte-at-a-time computation, so this does not affect compatibility. The new algorithm is only used for the CRC-32C variant, not the legacy version used in tsquery or the "traditional" CRC-32 used in hstore and ltree. Those are not as performance critical, and are usually only applied over small inputs, so it seems better to not carry around the extra lookup tables to speed up those rare cases. Abhijit Menon-Sen		2015-02-10 10:54:40 +02:00
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ac_func_accept_argtypes.m4
acx_pthread.m4	Remove some useless code in the configure script.	2014-07-01 17:51:53 -04:00
c-compiler.m4	Speed up CRC calculation using slicing-by-8 algorithm.	2015-02-10 10:54:40 +02:00
c-library.m4	Remove configure test for nonstandard variants of getpwuid_r().	2015-01-11 12:52:37 -05:00
config.guess
config.sub
docbook.m4
general.m4
install-sh
libtool.m4
Makefile
missing
perl.m4
prep_buildtree
programs.m4	Move PGAC_LDAP_SAFE to config/programs.m4.	2014-07-25 18:51:35 -04:00
python.m4
tcl.m4
test_quiet_include.h