relying on sign-extension of pointers.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@44805
138bc75d-0d04-0410-961f-
82ee72b054a4
+2001-08-11 Richard Henderson <rth@redhat.com>
+
+ * doc/extend.texi (Arrays and pointers implementation): Discourage
+ relying on sign-extension of pointers.
+
2001-08-11 H.J. Lu <hjl@gnu.org>
* config/mips/linux.h (EXTRA_SECTIONS): Remove in_ctors and
vice versa (6.3.2.3).}
A cast from pointer to integer discards most-significant bits if the
-pointer representation is larger than the integer type, sign-extends
+pointer representation is larger than the integer type,
+sign-extends@footnote{Future versions of GCC may zero-extend, or use
+a target-defined @code{ptr_extend} pattern. Do not rely on sign extension.}
if the pointer representation is smaller than the integer type, otherwise
the bits are unchanged.
@c ??? We've always claimed that pointers were unsigned entities.