diff options
| author | Andres Freund | 2017-09-29 22:52:55 +0000 |
|---|---|---|
| committer | Andres Freund | 2017-09-30 00:24:39 +0000 |
| commit | 510b8cbff15fcece246f66f2273ccf830a6c7e98 (patch) | |
| tree | 75dc05371931da2dfb72ba33084689658daa537c /configure | |
| parent | 0008a106d4f84206a96fc1fb09a1e6b09f1627ec (diff) | |
Extend & revamp pg_bswap.h infrastructure.
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
Diffstat (limited to 'configure')
| -rwxr-xr-x | configure | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/configure b/configure index 4f3b97c7cf7..216447e7390 100755 --- a/configure +++ b/configure @@ -11817,6 +11817,30 @@ 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; } if ${pgac_cv__builtin_bswap32+:} false; then : |