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extend.texi (Arrays and pointers implementation): Discourage relying on sign-extension of pointers.

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* doc/extend.texi (Arrays and pointers implementation): Discourage
        relying on sign-extension of pointers.

From-SVN: r44805
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Richard Henderson 2001-08-11 13:13:46 -07:00 committed by Richard Henderson
parent 9344c8ded1
commit 58f4de4f27
2 changed files with 8 additions and 1 deletions
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gcc/ChangeLog
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@ -1,3 +1,8 @@
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

4
gcc/doc/extend.texi
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@ -202,7 +202,9 @@ IEC 60559 conformant implementation (F.9).}
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.