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| author | rth <rth@138bc75d-0d04-0410-961f-82ee72b054a4> | 2001-08-11 20:13:46 +0000 |
|---|---|---|
| committer | rth <rth@138bc75d-0d04-0410-961f-82ee72b054a4> | 2001-08-11 20:13:46 +0000 |
| commit | 23fa08a2e17962ce4d215f4b0739d06914efaeef (patch) | |
| tree | 6c8e6180ed905d2fccefcf0d62b5b1a181460120 | |
| parent | 24536536ac51aad219a3cb9f6d13e36c851418a9 (diff) | |
| download | ppe42-gcc-23fa08a2e17962ce4d215f4b0739d06914efaeef.tar.gz ppe42-gcc-23fa08a2e17962ce4d215f4b0739d06914efaeef.zip | |
* doc/extend.texi (Arrays and pointers implementation): Discourage
relying on sign-extension of pointers.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@44805 138bc75d-0d04-0410-961f-82ee72b054a4
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/doc/extend.texi | 4 |
2 files changed, 8 insertions, 1 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index c23a962195c..481c55cf8aa 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -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 diff --git a/gcc/doc/extend.texi b/gcc/doc/extend.texi index 12b9e71bd5f..2951096078e 100644 --- a/gcc/doc/extend.texi +++ b/gcc/doc/extend.texi @@ -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. |
