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Extend & revamp pg_bswap.h infrastructure.

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Upcoming patches are going to address performance issues that involve
slow system provided ntohs/htons etc. To address that expand
pg_bswap.h to provide pg_ntoh{16,32,64}, pg_hton{16,32,64} and
optimize their respective implementations by using compiler intrinsics
for gcc compatible compilers and msvc. Fall back to manual
implementations using shifts etc otherwise.

Additionally remove multiple evaluation hazards from the existing
BSWAP32/64 macros, by replacing them with inline functions when
necessary. In the course of that the naming scheme is changed to
pg_bswap16/32/64.

Author: Andres Freund
Discussion: https://postgr.es/m/20170927172019.gheidqy6xvlxb325@alap3.anarazel.de
This commit is contained in:
Andres Freund
2017-09-29 15:52:55 -07:00
parent 0008a106d4
commit 510b8cbff1
8 changed files with 159 additions and 27 deletions
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1
configure.in
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@ -1306,6 +1306,7 @@ PGAC_C_FUNCNAME_SUPPORT
PGAC_C_STATIC_ASSERT
PGAC_C_TYPEOF
PGAC_C_TYPES_COMPATIBLE
PGAC_C_BUILTIN_BSWAP16
PGAC_C_BUILTIN_BSWAP32
PGAC_C_BUILTIN_BSWAP64
PGAC_C_BUILTIN_CONSTANT_P