[Bug c/13421] IA32 bigmem pointer subtraction and Âftrapv option causes unjustified program abort
pinskia at gcc dot gnu dot org
gcc-bugzilla@gcc.gnu.org
Wed Dec 17 18:22:00 GMT 2003
------- Additional Comments From pinskia at gcc dot gnu dot org 2003-12-17 17:53 -------
Pointers signness are determined by the ABI.
Here are the list of targets that are unsigned:
./alpha/vms.h:#define POINTERS_EXTEND_UNSIGNED 0
./ia64/hpux.h:#define POINTERS_EXTEND_UNSIGNED -1
./mips/mips.h:#define POINTERS_EXTEND_UNSIGNED 0
./s390/s390.h:#define POINTERS_EXTEND_UNSIGNED -1
./sparc/sparc.h:#define POINTERS_EXTEND_UNSIGNED 1
There are not many.
-ftrapv is done for all signed "addition, subtraction, multiplication operations".
So this is a request for documentation about -ftrapv and pointer arightatic.
--
What |Removed |Added
----------------------------------------------------------------------------
Severity|critical |minor
Status|UNCONFIRMED |NEW
Ever Confirmed| |1
Keywords| |documentation
Last reconfirmed|0000-00-00 00:00:00 |2003-12-17 17:53:14
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13421
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