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Nathan Bossart eb9ab7e093 Remove uses of popcount builtins. 
This commit replaces the implementations of pg_popcount{32,64} with
branchless ones in plain C.  While these new implementations do not
make use of more sophisticated population count instructions
available on some CPUs, testing indicates they perform well,
especially now that they are inlined.  Newer versions of popular
compilers will automatically replace these with special
instructions if possible, anyway.  A follow-up commit will replace
various loops over these functions with calls to pg_popcount(),
leaving us little reason to worry about micro-optimizing them
further.

Since this commit removes the only uses of the popcount builtins,
we can also remove the corresponding configuration checks.

Suggested-by: John Naylor <johncnaylorls@gmail.com>
Reviewed-by: John Naylor <johncnaylorls@gmail.com>
Discussion: https://postgr.es/m/CANWCAZY7R%2Biy%2Br9YM_sySNydHzNqUirx1xk0tB3ej5HO62GdgQ%40mail.gmail.com
2026-02-23 09:26:00 -06:00
..
access Update obsolete comment 2026-02-18 18:09:54 +01:00
archive Update copyright for 2026 2026-01-01 13:24:10 -05:00
backup Update copyright for 2026 2026-01-01 13:24:10 -05:00
bootstrap Simplify creation of built-in functions with default arguments. 2026-02-18 14:14:44 -05:00
catalog Avoid name collision with NOT NULL constraints 2026-02-21 12:22:08 +01:00
commands Harden _int_matchsel() against being attached to the wrong operator. 2026-02-09 10:14:22 -05:00
common Use fallthrough attribute instead of comment 2026-02-19 08:51:12 +01:00
datatype Update copyright for 2026 2026-01-01 13:24:10 -05:00
executor Use a bitmask for ExecInsertIndexTuples options 2026-02-17 17:59:45 +01:00
fe_utils Update copyright for 2026 2026-01-01 13:24:10 -05:00
foreign Update copyright for 2026 2026-01-01 13:24:10 -05:00
jit Fix typos and inconsistencies in code and comments 2026-01-05 09:19:15 +09:00
lib Future-proof sort template against undefined behavior 2026-02-07 17:02:35 +07:00
libpq Add password expiration warnings. 2026-02-11 10:36:15 -06:00
mb Replace pg_mblen() with bounds-checked versions. 2026-02-09 12:44:04 +13:00
nodes Add support for INSERT ... ON CONFLICT DO SELECT. 2026-02-12 09:57:04 +00:00
optimizer Store information about Append node consolidation in the final plan. 2026-02-10 17:55:59 -05:00
parser Remove p_is_insert from struct ParseState. 2026-02-12 09:01:42 +00:00
partitioning Update copyright for 2026 2026-01-01 13:24:10 -05:00
pch Update copyright for 2026 2026-01-01 13:24:10 -05:00
port Remove uses of popcount builtins. 2026-02-23 09:26:00 -06:00
portability Remove PG_MMAP_FLAGS from mem.h 2026-01-26 10:52:02 +09:00
postmaster Cleanup for log_min_messages changes in 38e0190ced 2026-02-11 16:38:18 +01:00
regex Update copyright for 2026 2026-01-01 13:24:10 -05:00
replication Avoid including utils/timestamp.h in conflict.h. 2026-02-23 10:19:05 +05:30
rewrite Update copyright for 2026 2026-01-01 13:24:10 -05:00
snowball Update to latest Snowball sources. 2026-01-05 15:22:37 -05:00
statistics Add support for "mcv" in pg_restore_extended_stats() 2026-01-29 12:14:08 +09:00
storage Align PGPROC to cache line boundary 2026-02-22 13:13:43 +02:00
tcop Separate RecoveryConflictReasons from procsignals 2026-02-10 16:23:08 +02:00
tsearch Replace pg_mblen() with bounds-checked versions. 2026-02-09 12:44:04 +13:00
utils Switch SysCacheIdentifier to a typedef enum 2026-02-18 09:58:38 +09:00
.gitignore Use <stdint.h> and <inttypes.h> for c.h integers. 2024-12-04 15:05:38 +13:00
c.h Use fallthrough attribute instead of comment 2026-02-19 08:51:12 +01:00
fmgr.h Improve type handling of varlena structures 2026-02-11 07:33:24 +09:00
funcapi.h Update copyright for 2026 2026-01-01 13:24:10 -05:00
getopt_long.h Update copyright for 2026 2026-01-01 13:24:10 -05:00
Makefile Fix build inconsistency due to the generation of wait-event code 2026-02-02 08:02:39 +09:00
meson.build Ensure that all three build methods install the same set of files. 2026-02-16 15:20:15 -05:00
miscadmin.h Add password expiration warnings. 2026-02-11 10:36:15 -06:00
pg_config.h.in Remove uses of popcount builtins. 2026-02-23 09:26:00 -06:00
pg_config_manual.h Update copyright for 2026 2026-01-01 13:24:10 -05:00
pg_getopt.h Update copyright for 2026 2026-01-01 13:24:10 -05:00
pg_trace.h Update copyright for 2026 2026-01-01 13:24:10 -05:00
pgstat.h Avoid including worker_internal.h in pgstat.h. 2026-02-20 09:26:33 +05:30
pgtar.h Update copyright for 2026 2026-01-01 13:24:10 -05:00
pgtime.h Update copyright for 2026 2026-01-01 13:24:10 -05:00
port.h strnlen() is now required 2026-01-08 08:51:20 +01:00
postgres.h Rename AssertVariableIsOfType to StaticAssertVariableIsOfType 2026-02-03 08:45:24 +01:00
postgres_ext.h Move pg_int64 back to postgres_ext.h 2025-09-16 10:48:56 +02:00
postgres_fe.h Update copyright for 2026 2026-01-01 13:24:10 -05:00
varatt.h Improve type handling of varlena structures 2026-02-11 07:33:24 +09:00
windowapi.h Update copyright for 2026 2026-01-01 13:24:10 -05:00