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postgresql/src/backend
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Nathan Bossart 41c51f0c68 Optimize visibilitymap_count() with AVX-512 instructions. 
Commit 792752af4e added infrastructure for using AVX-512 intrinsic
functions, and this commit uses that infrastructure to optimize
visibilitymap_count().  Specificially, a new pg_popcount_masked()
function is introduced that applies a bitmask to every byte in the
buffer prior to calculating the population count, which is used to
filter out the all-visible or all-frozen bits as needed.  Platforms
without AVX-512 support should also see a nice speedup due to the
reduced number of calls to a function pointer.

Co-authored-by: Ants Aasma
Discussion: https://postgr.es/m/BL1PR11MB5304097DF7EA81D04C33F3D1DCA6A%40BL1PR11MB5304.namprd11.prod.outlook.com
 		2024-04-06 22:58:23 -05:00
..
access Optimize visibilitymap_count() with AVX-512 instructions. 2024-04-06 22:58:23 -05:00
archive Add built-in ERROR handling for archive callbacks. 2024-04-02 22:28:11 -05:00
backup Align blocks in incremental backups to BLCKSZ 2024-04-05 16:30:01 +02:00
bootstrap Remove unused #include's from backend .c files 2024-03-04 12:02:20 +01:00
catalog CREATE INDEX: do not update stats during binary upgrade. 2024-04-03 16:12:45 -07:00
commands Implement ALTER TABLE ... SPLIT PARTITION ... command 2024-04-07 01:18:44 +03:00
executor Change BitmapAdjustPrefetchIterator to accept BlockNumber 2024-04-07 01:25:15 +02:00
foreign Remove unused #include's from backend .c files 2024-03-04 12:02:20 +01:00
jit Add SQL/JSON query functions 2024-03-21 17:07:03 +09:00
lib Use the pairing heap instead of a flat array for LSN replay waiters 2024-04-03 18:15:41 +03:00
libpq Revert "Add notBefore and notAfter to SSL cert info display" 2024-03-22 22:58:41 +01:00
main Remove unused #include's from backend .c files 2024-03-04 12:02:20 +01:00
nodes Add basic JSON_TABLE() functionality 2024-04-04 20:20:15 +09:00
optimizer Enhance nbtree ScalarArrayOp execution. 2024-04-06 11:47:10 -04:00
parser Implement ALTER TABLE ... SPLIT PARTITION ... command 2024-04-07 01:18:44 +03:00
partitioning Implement ALTER TABLE ... SPLIT PARTITION ... command 2024-04-07 01:18:44 +03:00
po Update copyright for 2024 2024-01-03 20:49:05 -05:00
port Remove unused #include's from backend .c files 2024-03-04 12:02:20 +01:00
postmaster Add built-in ERROR handling for archive callbacks. 2024-04-02 22:28:11 -05:00
regex Support C.UTF-8 locale in the new builtin collation provider. 2024-03-19 15:24:41 -07:00
replication Support retrieval of results in chunks with libpq. 2024-04-06 20:45:11 -04:00
rewrite Add RETURNING support to MERGE. 2024-03-17 13:58:59 +00:00
snowball Remove unused #include's from backend .c files 2024-03-04 12:02:20 +01:00
statistics Make stxstattarget nullable 2024-03-17 12:26:26 +01:00
storage Fix if/while thinko in read_stream.c edge case. 2024-04-07 14:51:33 +12:00
tcop Invent SERIALIZE option for EXPLAIN. 2024-04-03 17:41:57 -04:00
tsearch Remove unused #include's from backend .c files 2024-03-04 12:02:20 +01:00
utils Implement ALTER TABLE ... SPLIT PARTITION ... command 2024-04-07 01:18:44 +03:00
.gitignore
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Makefile Rework lwlocknames.txt to become lwlocklist.h 2024-03-20 11:55:20 +01:00
common.mk Blind attempt to fix LLVM dependency in the backend 2022-09-15 10:53:48 +07:00
meson.build Remove AIX support 2024-02-28 15:17:23 +04:00
nls.mk Remove distprep 2023-11-06 15:18:04 +01:00