Avoid unnecessary pointer scanning in garbage collection (Bug#10780).

* alloc.c (POINTERS_MIGHT_HIDE_IN_OBJECTS): New macro.
(mark_memory): Mark Lisp_Objects only if pointers might hide in
objects, as mark_maybe_pointer will catch them otherwise.
(GC_LISP_OBJECT_ALIGNMENT): Remove; no longer needed.
* s/gnu-linux.h (GC_LISP_OBJECT_ALIGNMENT) [__mc68000__]: Likewise.

1 files changed, 0 insertions, 3 deletions

diff --git a/src/s/gnu-linux.h b/src/s/gnu-linux.h
index b54bd985e6b..c1233c0e6ce 100644
--- a/src/s/gnu-linux.h
+++ b/src/s/gnu-linux.h
@@ -146,9 +146,6 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
     || defined __ia64__ || defined __sh__
 #define GC_SETJMP_WORKS 1
 #define GC_MARK_STACK GC_MAKE_GCPROS_NOOPS
-#ifdef __mc68000__
-#define GC_LISP_OBJECT_ALIGNMENT 2
-#endif
 #ifdef __ia64__
 #define GC_MARK_SECONDARY_STACK()                               \
   do {                                                          \