Revert attempts to use POPCNT etc instructions

This reverts commits fc6c72747ae6, 109de05cbb03, d0b4663c23b7 and
711bab1e4d19.

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.

1 files changed, 0 insertions, 119 deletions

diff --git a/configure b/configure
index 2e3cc372a6..7291311ae3 100755
--- a/configure
+++ b/configure
@@ -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
 
 
@@ -14077,30 +14033,6 @@ 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; }
 if ${pgac_cv__builtin_constant_p+:} false; then :
@@ -14128,54 +14060,6 @@ if test x"$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; }
 if ${pgac_cv__builtin_unreachable+:} false; then :
@@ -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