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| author | Richard Henderson <rth@redhat.com> | 2001-08-11 13:13:46 -0700 |
|---|---|---|
| committer | Richard Henderson <rth@gcc.gnu.org> | 2001-08-11 13:13:46 -0700 |
| commit | 58f4de4f271c66738b406b43cff19661ec5d9b5a (patch) | |
| tree | 6c8e6180ed905d2fccefcf0d62b5b1a181460120 /gcc | |
| parent | 9344c8ded1784bfd0fd9f9cfa78fdd83ccbd2b57 (diff) | |
| download | gcc-58f4de4f271c66738b406b43cff19661ec5d9b5a.zip gcc-58f4de4f271c66738b406b43cff19661ec5d9b5a.tar.gz gcc-58f4de4f271c66738b406b43cff19661ec5d9b5a.tar.bz2 | |
extend.texi (Arrays and pointers implementation): Discourage relying on sign-extension of pointers.
* doc/extend.texi (Arrays and pointers implementation): Discourage
relying on sign-extension of pointers.
From-SVN: r44805
Diffstat (limited to 'gcc')
| -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 c23a962..481c55c 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 12b9e71..2951096 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. |