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Add basic support for using the POPCNT and SSE4.2s LZCNT opcodes

Browse Source 
These opcodes have been around in the AMD world since 2007, and 2008 in
the case of intel.  They're supported in GCC and Clang via some __builtin
macros.  The opcodes may be unavailable during runtime, in which case we
fall back on a C-based implementation of the code.  In order to get the
POPCNT instruction we must pass the -mpopcnt option to the compiler.  We
do this only for the pg_bitutils.c file.

David Rowley (with fragments taken from a patch by Thomas Munro)

Discussion: https://postgr.es/m/CAKJS1f9WTAGG1tPeJnD18hiQW5gAk59fQ6WK-vfdAKEHyRg2RA@mail.gmail.com
This commit is contained in:
Alvaro Herrera
2019-02-13 16:10:06 -03:00
parent 754ca99314
commit 711bab1e4d
13 changed files with 912 additions and 167 deletions
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155
configure vendored
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@ -651,6 +651,7 @@ CFLAGS_ARMV8_CRC32C
CFLAGS_SSE42
have_win32_dbghelp
LIBOBJS
CFLAGS_POPCNT
UUID_LIBS
LDAP_LIBS_BE
LDAP_LIBS_FE
@ -14059,6 +14060,158 @@ if test x"$pgac_cv__builtin_constant_p" = xyes ; then
$as_echo "#define HAVE__BUILTIN_CONSTANT_P 1" >>confdefs.h
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for __builtin_popcount" >&5
$as_echo_n "checking for __builtin_popcount... " >&6; }
if ${pgac_cv_popcount+:} false; then :
$as_echo_n "(cached) " >&6
else
pgac_save_CFLAGS=$CFLAGS
CFLAGS="$pgac_save_CFLAGS -mpopcnt"
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
static int x = __builtin_popcount(255);
_ACEOF
if ac_fn_c_try_compile "$LINENO"; then :
pgac_cv_popcount=yes
else
pgac_cv_popcount=no
fi
rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
CFLAGS="$pgac_save_CFLAGS"
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $pgac_cv_popcount" >&5
$as_echo "$pgac_cv_popcount" >&6; }
if test x"$pgac_cv_popcount" = x"yes"; then
CFLAGS_POPCNT="-mpopcnt"
$as_echo "#define HAVE__BUILTIN_POPCOUNT 1" >>confdefs.h
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for __builtin_popcountl" >&5
$as_echo_n "checking for __builtin_popcountl... " >&6; }
if ${pgac_cv_popcountl+:} false; then :
$as_echo_n "(cached) " >&6
else
pgac_save_CFLAGS=$CFLAGS
CFLAGS="$pgac_save_CFLAGS -mpopcnt"
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
static int x = __builtin_popcountl(255);
_ACEOF
if ac_fn_c_try_compile "$LINENO"; then :
pgac_cv_popcountl=yes
else
pgac_cv_popcountl=no
fi
rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
CFLAGS="$pgac_save_CFLAGS"
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $pgac_cv_popcountl" >&5
$as_echo "$pgac_cv_popcountl" >&6; }
if test x"$pgac_cv_popcountl" = x"yes"; then
CFLAGS_POPCNT="-mpopcnt"
$as_echo "#define HAVE__BUILTIN_POPCOUNTL 1" >>confdefs.h
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for __builtin_ctz" >&5
$as_echo_n "checking for __builtin_ctz... " >&6; }
if ${pgac_cv__builtin_ctz+:} false; then :
$as_echo_n "(cached) " >&6
else
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
static int x = __builtin_ctz(256);
_ACEOF
if ac_fn_c_try_compile "$LINENO"; then :
pgac_cv__builtin_ctz=yes
else
pgac_cv__builtin_ctz=no
fi
rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $pgac_cv__builtin_ctz" >&5
$as_echo "$pgac_cv__builtin_ctz" >&6; }
if test x"$pgac_cv__builtin_ctz" = xyes ; then
$as_echo "#define HAVE__BUILTIN_CTZ 1" >>confdefs.h
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for __builtin_ctzl" >&5
$as_echo_n "checking for __builtin_ctzl... " >&6; }
if ${pgac_cv__builtin_ctzl+:} false; then :
$as_echo_n "(cached) " >&6
else
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
static int x = __builtin_ctzl(256);
_ACEOF
if ac_fn_c_try_compile "$LINENO"; then :
pgac_cv__builtin_ctzl=yes
else
pgac_cv__builtin_ctzl=no
fi
rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $pgac_cv__builtin_ctzl" >&5
$as_echo "$pgac_cv__builtin_ctzl" >&6; }
if test x"$pgac_cv__builtin_ctzl" = xyes ; then
$as_echo "#define HAVE__BUILTIN_CTZL 1" >>confdefs.h
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for __builtin_clz" >&5
$as_echo_n "checking for __builtin_clz... " >&6; }
if ${pgac_cv__builtin_clz+:} false; then :
$as_echo_n "(cached) " >&6
else
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
static int x = __builtin_clz(256);
_ACEOF
if ac_fn_c_try_compile "$LINENO"; then :
pgac_cv__builtin_clz=yes
else
pgac_cv__builtin_clz=no
fi
rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $pgac_cv__builtin_clz" >&5
$as_echo "$pgac_cv__builtin_clz" >&6; }
if test x"$pgac_cv__builtin_clz" = xyes ; then
$as_echo "#define HAVE__BUILTIN_CLZ 1" >>confdefs.h
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for __builtin_clzl" >&5
$as_echo_n "checking for __builtin_clzl... " >&6; }
if ${pgac_cv__builtin_clzl+:} false; then :
$as_echo_n "(cached) " >&6
else
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
static int x = __builtin_clzl(256);
_ACEOF
if ac_fn_c_try_compile "$LINENO"; then :
pgac_cv__builtin_clzl=yes
else
pgac_cv__builtin_clzl=no
fi
rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $pgac_cv__builtin_clzl" >&5
$as_echo "$pgac_cv__builtin_clzl" >&6; }
if test x"$pgac_cv__builtin_clzl" = xyes ; then
$as_echo "#define HAVE__BUILTIN_CLZL 1" >>confdefs.h
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for __builtin_unreachable" >&5
$as_echo_n "checking for __builtin_unreachable... " >&6; }
@ -14577,6 +14730,8 @@ $as_echo "#define LOCALE_T_IN_XLOCALE 1" >>confdefs.h
fi
# MSVC doesn't cope well with defining restrict to __restrict, the
# spelling it understands, because it conflicts with
# __declspec(restrict). Therefore we define pg_restrict to the