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Revert attempts to use POPCNT etc instructions

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This reverts commits fc6c72747a, 109de05cbb, d0b4663c23 and
711bab1e4d.

Somebody will have to try harder before submitting this patch again.
I've spent entirely too much time on it already, and the #ifdef maze yet
to be written in order for it to build at all got on my nerves.  The
amount of work needed to get a platform-specific performance improvement
that's barely above the noise level is not worth it.
This commit is contained in:
Alvaro Herrera
2019-02-15 16:32:30 -03:00
parent e89f14e2bb
commit 457aef0f1f
14 changed files with 167 additions and 707 deletions
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119
configure vendored
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@ -651,7 +651,6 @@ CFLAGS_ARMV8_CRC32C
CFLAGS_SSE42
have_win32_dbghelp
LIBOBJS
have__builtin_popcount
UUID_LIBS
LDAP_LIBS_BE
LDAP_LIBS_FE
@ -733,7 +732,6 @@ CPP
BITCODE_CXXFLAGS
BITCODE_CFLAGS
CFLAGS_VECTOR
CFLAGS_POPCNT
PERMIT_DECLARATION_AFTER_STATEMENT
LLVM_BINPATH
LLVM_CXXFLAGS
@ -6582,48 +6580,6 @@ fi
fi
# Optimization flags and options for bit-twiddling
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether ${CC} supports -mpopcnt, for CFLAGS_POPCNT" >&5
$as_echo_n "checking whether ${CC} supports -mpopcnt, for CFLAGS_POPCNT... " >&6; }
if ${pgac_cv_prog_CC_cflags__mpopcnt+:} false; then :
$as_echo_n "(cached) " >&6
else
pgac_save_CFLAGS=$CFLAGS
pgac_save_CC=$CC
CC=${CC}
CFLAGS="${CFLAGS_POPCNT} -mpopcnt"
ac_save_c_werror_flag=$ac_c_werror_flag
ac_c_werror_flag=yes
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
int
main ()
{
;
return 0;
}
_ACEOF
if ac_fn_c_try_compile "$LINENO"; then :
pgac_cv_prog_CC_cflags__mpopcnt=yes
else
pgac_cv_prog_CC_cflags__mpopcnt=no
fi
rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
ac_c_werror_flag=$ac_save_c_werror_flag
CFLAGS="$pgac_save_CFLAGS"
CC="$pgac_save_CC"
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $pgac_cv_prog_CC_cflags__mpopcnt" >&5
$as_echo "$pgac_cv_prog_CC_cflags__mpopcnt" >&6; }
if test x"$pgac_cv_prog_CC_cflags__mpopcnt" = x"yes"; then
CFLAGS_POPCNT="${CFLAGS_POPCNT} -mpopcnt"
fi
CFLAGS_VECTOR=$CFLAGS_VECTOR
@ -14076,30 +14032,6 @@ if test x"$pgac_cv__builtin_bswap64" = xyes ; then
$as_echo "#define HAVE__BUILTIN_BSWAP64 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_constant_p" >&5
$as_echo_n "checking for __builtin_constant_p... " >&6; }
@ -14127,54 +14059,6 @@ if test x"$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_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_popcount" >&5
$as_echo_n "checking for __builtin_popcount... " >&6; }
if ${pgac_cv__builtin_popcount+:} false; then :
$as_echo_n "(cached) " >&6
else
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
static int x = __builtin_popcount(255);
_ACEOF
if ac_fn_c_try_compile "$LINENO"; then :
pgac_cv__builtin_popcount=yes
else
pgac_cv__builtin_popcount=no
fi
rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $pgac_cv__builtin_popcount" >&5
$as_echo "$pgac_cv__builtin_popcount" >&6; }
if test x"$pgac_cv__builtin_popcount" = x"yes"; then
$as_echo "#define HAVE__BUILTIN_POPCOUNT 1" >>confdefs.h
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for __builtin_unreachable" >&5
$as_echo_n "checking for __builtin_unreachable... " >&6; }
@ -14693,9 +14577,6 @@ $as_echo "#define LOCALE_T_IN_XLOCALE 1" >>confdefs.h
fi
have__builtin_popcount=$pgac_cv__builtin_popcount
# 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