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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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9
configure.in
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@ -547,10 +547,6 @@ elif test "$PORTNAME" = "hpux"; then
PGAC_PROG_CXX_CFLAGS_OPT([+Olibmerrno])
fi
# Optimization flags and options for bit-twiddling
PGAC_PROG_CC_VAR_OPT(CFLAGS_POPCNT, [-mpopcnt])
AC_SUBST(CFLAGS_POPCNT)
AC_SUBST(CFLAGS_VECTOR, $CFLAGS_VECTOR)
# Determine flags used to emit bitcode for JIT inlining. Need to test
@ -1492,10 +1488,7 @@ PGAC_C_TYPES_COMPATIBLE
PGAC_C_BUILTIN_BSWAP16
PGAC_C_BUILTIN_BSWAP32
PGAC_C_BUILTIN_BSWAP64
PGAC_C_BUILTIN_CLZ
PGAC_C_BUILTIN_CONSTANT_P
PGAC_C_BUILTIN_CTZ
PGAC_C_BUILTIN_POPCOUNT
PGAC_C_BUILTIN_UNREACHABLE
PGAC_C_COMPUTED_GOTO
PGAC_STRUCT_TIMEZONE
@ -1510,8 +1503,6 @@ AC_TYPE_LONG_LONG_INT
PGAC_TYPE_LOCALE_T
AC_SUBST(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