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For all ppc compilers, implement compare_exchange and fetch_add with asm.

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This is more like how we handle s_lock.h and arch-x86.h.

Reviewed by Tom Lane.

Discussion: https://postgr.es/m/20191005173400.GA3979129@rfd.leadboat.com
This commit is contained in:
Noah Misch
2019-10-18 20:20:52 -07:00
parent 89b4d7744c
commit 30ee5d17c2
8 changed files with 298 additions and 151 deletions
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40
configure vendored
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@ -14517,6 +14517,46 @@ $as_echo "$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) : "b"(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