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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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52
config/c-compiler.m4
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@ -378,58 +378,6 @@ fi])# PGAC_C_BUILTIN_OP_OVERFLOW
# PGAC_C_BUILTIN_POPCOUNT
# -------------------------
AC_DEFUN([PGAC_C_BUILTIN_POPCOUNT],
[AC_CACHE_CHECK([for __builtin_popcount], pgac_cv__builtin_popcount,
[AC_COMPILE_IFELSE([AC_LANG_SOURCE(
[static int x = __builtin_popcount(255);]
)],
[pgac_cv__builtin_popcount=yes],
[pgac_cv__builtin_popcount=no])])
if test x"$pgac_cv__builtin_popcount" = x"yes"; then
AC_DEFINE(HAVE__BUILTIN_POPCOUNT, 1,
[Define to 1 if your compiler understands __builtin_popcount.])
fi])# PGAC_C_BUILTIN_POPCOUNT
# PGAC_C_BUILTIN_CTZ
# -------------------------
# Check if the C compiler understands __builtin_ctz(),
# and define HAVE__BUILTIN_CTZ if so.
AC_DEFUN([PGAC_C_BUILTIN_CTZ],
[AC_CACHE_CHECK(for __builtin_ctz, pgac_cv__builtin_ctz,
[AC_COMPILE_IFELSE([AC_LANG_SOURCE(
[static int x = __builtin_ctz(256);]
)],
[pgac_cv__builtin_ctz=yes],
[pgac_cv__builtin_ctz=no])])
if test x"$pgac_cv__builtin_ctz" = xyes ; then
AC_DEFINE(HAVE__BUILTIN_CTZ, 1,
[Define to 1 if your compiler understands __builtin_ctz.])
fi])# PGAC_C_BUILTIN_CTZ
# PGAC_C_BUILTIN_CLZ
# -------------------------
# Check if the C compiler understands __builtin_clz(),
# and define HAVE__BUILTIN_CLZ if so.
AC_DEFUN([PGAC_C_BUILTIN_CLZ],
[AC_CACHE_CHECK(for __builtin_clz, pgac_cv__builtin_clz,
[AC_COMPILE_IFELSE([AC_LANG_SOURCE(
[static int x = __builtin_clz(256);]
)],
[pgac_cv__builtin_clz=yes],
[pgac_cv__builtin_clz=no])])
if test x"$pgac_cv__builtin_clz" = xyes ; then
AC_DEFINE(HAVE__BUILTIN_CLZ, 1,
[Define to 1 if your compiler understands __builtin_clz.])
fi])# PGAC_C_BUILTIN_CLZ
# PGAC_C_BUILTIN_UNREACHABLE
# --------------------------
# Check if the C compiler understands __builtin_unreachable(),