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

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

View File

@ -1539,6 +1539,26 @@ case $host_cpu in
if test x"$pgac_cv_have_ppc_mutex_hint" = xyes ; then
AC_DEFINE(HAVE_PPC_LWARX_MUTEX_HINT, 1, [Define to 1 if the assembler supports PPC's LWARX mutex hint bit.])
fi
# Check if compiler accepts "i"(x) when __builtin_constant_p(x).
AC_CACHE_CHECK([whether __builtin_constant_p(x) implies "i"(x) acceptance],
[pgac_cv_have_i_constraint__builtin_constant_p],
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
[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); }], [])],
[pgac_cv_have_i_constraint__builtin_constant_p=yes],
[pgac_cv_have_i_constraint__builtin_constant_p=no])])
if test x"$pgac_cv_have_i_constraint__builtin_constant_p" = xyes ; then
AC_DEFINE(HAVE_I_CONSTRAINT__BUILTIN_CONSTANT_P, 1,
[Define to 1 if __builtin_constant_p(x) implies "i"(x) acceptance.])
fi
;;
esac