Attached is a draft patch to incorporate Victor's slimmed-down test
into configure. If you have a chance, could you confirm it does
the right thing on your Sparc machine?
BTW, it would be a good idea to set up a buildfarm member on that
machine, if you care about whether that configuration continues
to work in the future.
regards, tom lane
diff --git a/config/c-compiler.m4 b/config/c-compiler.m4
index 076656c..cbfccf6 100644
*** a/config/c-compiler.m4
--- b/config/c-compiler.m4
*************** AC_DEFUN([PGAC_TYPE_128BIT_INT],
*** 108,136 ****
[AC_CACHE_CHECK([for __int128], [pgac_cv__128bit_int],
[AC_LINK_IFELSE([AC_LANG_PROGRAM([
/*
* These are globals to discourage the compiler from folding all the
* arithmetic tests down to compile-time constants. We do not have
! * convenient support for 64bit literals at this point...
*/
__int128 a = 48828125;
! __int128 b = 97656255;
],[
__int128 c,d;
a = (a << 12) + 1; /* 200000000001 */
b = (b << 12) + 5; /* 400000000005 */
! /* use the most relevant arithmetic ops */
c = a * b;
d = (c + b) / b;
! /* return different values, to prevent optimizations */
if (d != a+1)
! return 0;
! return 1;
])],
[pgac_cv__128bit_int=yes],
[pgac_cv__128bit_int=no])])
if test x"$pgac_cv__128bit_int" = xyes ; then
! AC_DEFINE(PG_INT128_TYPE, __int128, [Define to the name of a signed 128-bit integer type.])
! AC_CHECK_ALIGNOF(PG_INT128_TYPE)
fi])# PGAC_TYPE_128BIT_INT
--- 108,166 ----
[AC_CACHE_CHECK([for __int128], [pgac_cv__128bit_int],
[AC_LINK_IFELSE([AC_LANG_PROGRAM([
/*
+ * We don't actually run this test, just link it to verify that any support
+ * functions needed for __int128 are present.
+ *
* These are globals to discourage the compiler from folding all the
* arithmetic tests down to compile-time constants. We do not have
! * convenient support for 128bit literals at this point...
*/
__int128 a = 48828125;
! __int128 b = 97656250;
],[
__int128 c,d;
a = (a << 12) + 1; /* 200000000001 */
b = (b << 12) + 5; /* 400000000005 */
! /* try the most relevant arithmetic ops */
c = a * b;
d = (c + b) / b;
! /* must use the results, else compiler may optimize arithmetic away */
if (d != a+1)
! return 1;
])],
[pgac_cv__128bit_int=yes],
[pgac_cv__128bit_int=no])])
if test x"$pgac_cv__128bit_int" = xyes ; then
! # Some versions of gcc have problems passing __int128 function arguments
! # when using non-default alignment. Test that, if not cross-compiling.
! AC_CACHE_CHECK([for __int128 alignment bug], [pgac_cv__128bit_int_bug],
! [AC_RUN_IFELSE([AC_LANG_PROGRAM([
! /* This must match the corresponding code in c.h: */
! #if defined(__GNUC__) || defined(__SUNPRO_C) || defined(__IBMC__)
! #define pg_attribute_aligned(a) __attribute__((aligned(a)))
! #endif
! typedef __int128 int128a
! #if defined(pg_attribute_aligned)
! pg_attribute_aligned(8)
! #endif
! ;
! int128a holder;
! void pass_by_val(void *buffer, int128a par) { holder = par; }
! ],[
! long int i64 = 97656225L << 12;
! int128a q;
! pass_by_val(main, (int128a) i64);
! q = (int128a) i64;
! if (q != holder)
! return 1;
! ])],
! [pgac_cv__128bit_int_bug=ok],
! [pgac_cv__128bit_int_bug=broken],
! [pgac_cv__128bit_int_bug=assuming-ok])])
! if test x"$pgac_cv__128bit_int_bug" != xbroken ; then
! AC_DEFINE(PG_INT128_TYPE, __int128, [Define to the name of a signed 128-bit integer type.])
! AC_CHECK_ALIGNOF(PG_INT128_TYPE)
! fi
fi])# PGAC_TYPE_128BIT_INT
diff --git a/configure b/configure
index 45221e1..6eaed45 100755
*** a/configure
--- b/configure
*************** else
*** 14996,15007 ****
/* end confdefs.h. */
/*
* These are globals to discourage the compiler from folding all the
* arithmetic tests down to compile-time constants. We do not have
! * convenient support for 64bit literals at this point...
*/
__int128 a = 48828125;
! __int128 b = 97656255;
int
main ()
--- 14996,15010 ----
/* end confdefs.h. */
/*
+ * We don't actually run this test, just link it to verify that any support
+ * functions needed for __int128 are present.
+ *
* These are globals to discourage the compiler from folding all the
* arithmetic tests down to compile-time constants. We do not have
! * convenient support for 128bit literals at this point...
*/
__int128 a = 48828125;
! __int128 b = 97656250;
int
main ()
*************** main ()
*** 15010,15022 ****
__int128 c,d;
a = (a << 12) + 1; /* 200000000001 */
b = (b << 12) + 5; /* 400000000005 */
! /* use the most relevant arithmetic ops */
c = a * b;
d = (c + b) / b;
! /* return different values, to prevent optimizations */
if (d != a+1)
! return 0;
! return 1;
;
return 0;
--- 15013,15024 ----
__int128 c,d;
a = (a << 12) + 1; /* 200000000001 */
b = (b << 12) + 5; /* 400000000005 */
! /* try the most relevant arithmetic ops */
c = a * b;
d = (c + b) / b;
! /* must use the results, else compiler may optimize arithmetic away */
if (d != a+1)
! return 1;
;
return 0;
*************** fi
*** 15033,15042 ****
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $pgac_cv__128bit_int" >&5
$as_echo "$pgac_cv__128bit_int" >&6; }
if test x"$pgac_cv__128bit_int" = xyes ; then
$as_echo "#define PG_INT128_TYPE __int128" >>confdefs.h
! # The cast to long int works around a bug in the HP C Compiler,
# see AC_CHECK_SIZEOF for more information.
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking alignment of PG_INT128_TYPE" >&5
$as_echo_n "checking alignment of PG_INT128_TYPE... " >&6; }
--- 15035,15097 ----
{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $pgac_cv__128bit_int" >&5
$as_echo "$pgac_cv__128bit_int" >&6; }
if test x"$pgac_cv__128bit_int" = xyes ; then
+ # Some versions of gcc have problems passing __int128 function arguments
+ # when using non-default alignment. Test that, if not cross-compiling.
+ { $as_echo "$as_me:${as_lineno-$LINENO}: checking for __int128 alignment bug" >&5
+ $as_echo_n "checking for __int128 alignment bug... " >&6; }
+ if ${pgac_cv__128bit_int_bug+:} false; then :
+ $as_echo_n "(cached) " >&6
+ else
+ if test "$cross_compiling" = yes; then :
+ pgac_cv__128bit_int_bug=assuming-ok
+ else
+ cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+ /* end confdefs.h. */
+
+ /* This must match the corresponding code in c.h: */
+ #if defined(__GNUC__) || defined(__SUNPRO_C) || defined(__IBMC__)
+ #define pg_attribute_aligned(a) __attribute__((aligned(a)))
+ #endif
+ typedef __int128 int128a
+ #if defined(pg_attribute_aligned)
+ pg_attribute_aligned(8)
+ #endif
+ ;
+ int128a holder;
+ void pass_by_val(void *buffer, int128a par) { holder = par; }
+
+ int
+ main ()
+ {
+
+ long int i64 = 97656225L << 12;
+ int128a q;
+ pass_by_val(main, (int128a) i64);
+ q = (int128a) i64;
+ if (q != holder)
+ return 1;
+
+ ;
+ return 0;
+ }
+ _ACEOF
+ if ac_fn_c_try_run "$LINENO"; then :
+ pgac_cv__128bit_int_bug=ok
+ else
+ pgac_cv__128bit_int_bug=broken
+ fi
+ rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext \
+ conftest.$ac_objext conftest.beam conftest.$ac_ext
+ fi
+
+ fi
+ { $as_echo "$as_me:${as_lineno-$LINENO}: result: $pgac_cv__128bit_int_bug" >&5
+ $as_echo "$pgac_cv__128bit_int_bug" >&6; }
+ if test x"$pgac_cv__128bit_int_bug" != xbroken ; then
$as_echo "#define PG_INT128_TYPE __int128" >>confdefs.h
! # The cast to long int works around a bug in the HP C Compiler,
# see AC_CHECK_SIZEOF for more information.
{ $as_echo "$as_me:${as_lineno-$LINENO}: checking alignment of PG_INT128_TYPE" >&5
$as_echo_n "checking alignment of PG_INT128_TYPE... " >&6; }
*************** cat >>confdefs.h <<_ACEOF
*** 15071,15076 ****
--- 15126,15132 ----
_ACEOF
+ fi
fi
# Check for various atomic operations now that we have checked how to declare
