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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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24
configure vendored
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@ -11816,6 +11816,30 @@ if test x"$pgac_cv__types_compatible" = xyes ; then
$as_echo "#define HAVE__BUILTIN_TYPES_COMPATIBLE_P 1" >>confdefs.h
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for __builtin_bswap16" >&5
$as_echo_n "checking for __builtin_bswap16... " >&6; }
if ${pgac_cv__builtin_bswap16+:} false; then :
$as_echo_n "(cached) " >&6
else
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
static unsigned long int x = __builtin_bswap16(0xaabb);
_ACEOF
if ac_fn_c_try_compile "$LINENO"; then :
pgac_cv__builtin_bswap16=yes
else
pgac_cv__builtin_bswap16=no
fi
rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $pgac_cv__builtin_bswap16" >&5
$as_echo "$pgac_cv__builtin_bswap16" >&6; }
if test x"$pgac_cv__builtin_bswap16" = xyes ; then
$as_echo "#define HAVE__BUILTIN_BSWAP16 1" >>confdefs.h
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for __builtin_bswap32" >&5
$as_echo_n "checking for __builtin_bswap32... " >&6; }