re PR go/52084 (go tests fail to link on powerpc-linux-gnu (undefined reference to __sync_add_and_fetch_8))

PR go/52084
libgo: Provide more __sync functions if required.

From-SVN: r184138

libgo/config.h.in

@@ -105,10 +105,18 @@
 /* Define to 1 if <math.h> defines struct exception */
 #undef HAVE_STRUCT_EXCEPTION
 
+/* Define to 1 if the compiler provides the __sync_add_and_fetch function for
+   uint64 */
+#undef HAVE_SYNC_ADD_AND_FETCH_8
+
 /* Define to 1 if the compiler provides the __sync_bool_compare_and_swap
    function for uint32 */
 #undef HAVE_SYNC_BOOL_COMPARE_AND_SWAP_4
 
+/* Define to 1 if the compiler provides the __sync_bool_compare_and_swap
+   function for uint64 */
+#undef HAVE_SYNC_BOOL_COMPARE_AND_SWAP_8
+
 /* Define to 1 if the compiler provides the __sync_fetch_and_add function for
    uint32 */
 #undef HAVE_SYNC_FETCH_AND_ADD_4

libgo/configure

@@ -14667,6 +14667,35 @@ $as_echo "#define HAVE_SYNC_BOOL_COMPARE_AND_SWAP_4 1" >>confdefs.h
 
 fi
 
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for __sync_bool_compare_and_swap_8" >&5
+$as_echo_n "checking for __sync_bool_compare_and_swap_8... " >&6; }
+if test "${libgo_cv_func___sync_bool_compare_and_swap_8+set}" = set; then :
+  $as_echo_n "(cached) " >&6
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+typedef unsigned int uint64  __attribute__ ((mode (DI)));
+uint64 i;
+int main() { return __sync_bool_compare_and_swap (&i, 0, 1); }
+
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  libgo_cv_func___sync_bool_compare_and_swap_8=yes
+else
+  libgo_cv_func___sync_bool_compare_and_swap_8=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libgo_cv_func___sync_bool_compare_and_swap_8" >&5
+$as_echo "$libgo_cv_func___sync_bool_compare_and_swap_8" >&6; }
+if test "$libgo_cv_func___sync_bool_compare_and_swap_8" = "yes"; then
+
+$as_echo "#define HAVE_SYNC_BOOL_COMPARE_AND_SWAP_8 1" >>confdefs.h
+
+fi
+
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for __sync_fetch_and_add_4" >&5
 $as_echo_n "checking for __sync_fetch_and_add_4... " >&6; }
 if test "${libgo_cv_func___sync_fetch_and_add_4+set}" = set; then :
@@ -14696,6 +14725,35 @@ $as_echo "#define HAVE_SYNC_FETCH_AND_ADD_4 1" >>confdefs.h
 
 fi
 
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for __sync_add_and_fetch_8" >&5
+$as_echo_n "checking for __sync_add_and_fetch_8... " >&6; }
+if test "${libgo_cv_func___sync_add_and_fetch_8+set}" = set; then :
+  $as_echo_n "(cached) " >&6
+else
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+typedef unsigned int uint64  __attribute__ ((mode (DI)));
+uint64 i;
+int main() { return __sync_add_and_fetch (&i, 1); }
+
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  libgo_cv_func___sync_add_and_fetch_8=yes
+else
+  libgo_cv_func___sync_add_and_fetch_8=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libgo_cv_func___sync_add_and_fetch_8" >&5
+$as_echo "$libgo_cv_func___sync_add_and_fetch_8" >&6; }
+if test "$libgo_cv_func___sync_add_and_fetch_8" = "yes"; then
+
+$as_echo "#define HAVE_SYNC_ADD_AND_FETCH_8 1" >>confdefs.h
+
+fi
+
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether compiler supports -minline-all-stringops" >&5
 $as_echo_n "checking whether compiler supports -minline-all-stringops... " >&6; }
 if test "${libgo_cv_c_stringops+set}" = set; then :

libgo/configure.ac

@@ -497,6 +497,20 @@ if test "$libgo_cv_func___sync_bool_compare_and_swap_4" = "yes"; then
     [Define to 1 if the compiler provides the __sync_bool_compare_and_swap function for uint32])
 fi
 
+AC_CACHE_CHECK([for __sync_bool_compare_and_swap_8],
+[libgo_cv_func___sync_bool_compare_and_swap_8],
+[AC_LINK_IFELSE([
+typedef unsigned int uint64  __attribute__ ((mode (DI)));
+uint64 i;
+int main() { return __sync_bool_compare_and_swap (&i, 0, 1); }
+],
+[libgo_cv_func___sync_bool_compare_and_swap_8=yes],
+[libgo_cv_func___sync_bool_compare_and_swap_8=no])])
+if test "$libgo_cv_func___sync_bool_compare_and_swap_8" = "yes"; then
+  AC_DEFINE(HAVE_SYNC_BOOL_COMPARE_AND_SWAP_8, 1,
+    [Define to 1 if the compiler provides the __sync_bool_compare_and_swap function for uint64])
+fi
+
 AC_CACHE_CHECK([for __sync_fetch_and_add_4],
 [libgo_cv_func___sync_fetch_and_add_4],
 [AC_LINK_IFELSE([
@@ -511,6 +525,20 @@ if test "$libgo_cv_func___sync_fetch_and_add_4" = "yes"; then
     [Define to 1 if the compiler provides the __sync_fetch_and_add function for uint32])
 fi
 
+AC_CACHE_CHECK([for __sync_add_and_fetch_8],
+[libgo_cv_func___sync_add_and_fetch_8],
+[AC_LINK_IFELSE([
+typedef unsigned int uint64  __attribute__ ((mode (DI)));
+uint64 i;
+int main() { return __sync_add_and_fetch (&i, 1); }
+],
+[libgo_cv_func___sync_add_and_fetch_8=yes],
+[libgo_cv_func___sync_add_and_fetch_8=no])])
+if test "$libgo_cv_func___sync_add_and_fetch_8" = "yes"; then
+  AC_DEFINE(HAVE_SYNC_ADD_AND_FETCH_8, 1,
+    [Define to 1 if the compiler provides the __sync_add_and_fetch function for uint64])
+fi
+
 dnl For x86 we want to use the -minline-all-stringops option to avoid
 dnl forcing a stack split when calling memcpy and friends.
 AC_CACHE_CHECK([whether compiler supports -minline-all-stringops],

libgo/runtime/thread.c

@@ -11,7 +11,7 @@
 /* For targets which don't have the required sync support.  Really
    these should be provided by gcc itself.  FIXME.  */
 
-#if !defined (HAVE_SYNC_BOOL_COMPARE_AND_SWAP_4) || !defined (HAVE_SYNC_FETCH_AND_ADD_4)
+#if !defined (HAVE_SYNC_BOOL_COMPARE_AND_SWAP_4) || !defined (HAVE_SYNC_BOOL_COMPARE_AND_SWAP_8) || !defined (HAVE_SYNC_FETCH_AND_ADD_4) || !defined (HAVE_SYNC_ADD_AND_FETCH_8)
 
 static pthread_mutex_t sync_lock = PTHREAD_MUTEX_INITIALIZER;
 
@@ -48,6 +48,37 @@ __sync_bool_compare_and_swap_4 (uint32* ptr, uint32 old, uint32 new)
 
 #endif
 
+#ifndef HAVE_SYNC_BOOL_COMPARE_AND_SWAP_8
+
+_Bool
+__sync_bool_compare_and_swap_8 (uint64*, uint64, uint64)
+  __attribute__ ((visibility ("hidden")));
+
+_Bool
+__sync_bool_compare_and_swap_8 (uint64* ptr, uint64 old, uint64 new)
+{
+  int i;
+  _Bool ret;
+
+  i = pthread_mutex_lock (&sync_lock);
+  __go_assert (i == 0);
+
+  if (*ptr != old)
+    ret = 0;
+  else
+    {
+      *ptr = new;
+      ret = 1;
+    }
+
+  i = pthread_mutex_unlock (&sync_lock);
+  __go_assert (i == 0);
+
+  return ret;
+}
+
+#endif
+
 #ifndef HAVE_SYNC_FETCH_AND_ADD_4
 
 uint32
@@ -74,6 +105,32 @@ __sync_fetch_and_add_4 (uint32* ptr, uint32 add)
 
 #endif
 
+#ifndef HAVE_SYNC_ADD_AND_FETCH_8
+
+uint64
+__sync_add_and_fetch_8 (uint64*, uint64)
+  __attribute__ ((visibility ("hidden")));
+
+uint64
+__sync_add_and_fetch_8 (uint64* ptr, uint64 add)
+{
+  int i;
+  uint64 ret;
+
+  i = pthread_mutex_lock (&sync_lock);
+  __go_assert (i == 0);
+
+  *ptr += add;
+  ret = *ptr;
+
+  i = pthread_mutex_unlock (&sync_lock);
+  __go_assert (i == 0);
+
+  return ret;
+}
+
+#endif
+
 // Called to initialize a new m (including the bootstrap m).
 void
 runtime_minit(void)