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Revert "For all ppc compilers, implement pg_atomic_fetch_add_ with inline asm."

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This reverts commit e7ff59686e.  It
defined pg_atomic_fetch_add_u32_impl() without defining
pg_atomic_compare_exchange_u32_impl(), which is incompatible with
src/include/port/atomics/fallback.h.  Per buildfarm member prairiedog.

Discussion: https://postgr.es/m/7517.1568470247@sss.pgh.pa.us
This commit is contained in:
Noah Misch
2019-09-14 19:38:41 -07:00
parent e7ff59686e
commit 87e9fae069
5 changed files with 66 additions and 161 deletions
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40
configure vendored
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@ -14593,46 +14593,6 @@ $as_echo "$pgac_cv_have_ppc_mutex_hint" >&6; }
$as_echo "#define HAVE_PPC_LWARX_MUTEX_HINT 1" >>confdefs.h
fi
# Check if compiler accepts "i"(x) when __builtin_constant_p(x).
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether __builtin_constant_p(x) implies \"i\"(x) acceptance" >&5
$as_echo_n "checking whether __builtin_constant_p(x) implies \"i\"(x) acceptance... " >&6; }
if ${pgac_cv_have_i_constraint__builtin_constant_p+:} false; then :
$as_echo_n "(cached) " >&6
else
cat confdefs.h - <<_ACEOF >conftest.$ac_ext
/* end confdefs.h. */
static inline int
addi(int ra, int si)
{
int res = 0;
if (__builtin_constant_p(si))
__asm__ __volatile__(
" addi %0,%1,%2\n" : "=r"(res) : "r"(ra), "i"(si));
return res;
}
int test_adds(int x) { return addi(3, x) + addi(x, 5); }
int
main ()
{
;
return 0;
}
_ACEOF
if ac_fn_c_try_compile "$LINENO"; then :
pgac_cv_have_i_constraint__builtin_constant_p=yes
else
pgac_cv_have_i_constraint__builtin_constant_p=no
fi
rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
fi
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $pgac_cv_have_i_constraint__builtin_constant_p" >&5
$as_echo "$pgac_cv_have_i_constraint__builtin_constant_p" >&6; }
if test x"$pgac_cv_have_i_constraint__builtin_constant_p" = xyes ; then
$as_echo "#define HAVE_I_CONSTRAINT__BUILTIN_CONSTANT_P 1" >>confdefs.h
fi
;;
esac