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[Bug c/70779] -trapv does not generate trapping vode for integer conversions
- From: "rguenth at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Mon, 25 Apr 2016 08:02:07 +0000
- Subject: [Bug c/70779] -trapv does not generate trapping vode for integer conversions
- Auto-submitted: auto-generated
- References: <bug-70779-4 at http dot gcc dot gnu dot org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70779
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |INVALID
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
conversions from unsigned to signed are not undefined but implementation
defined
and not covered by -ftrapv. Instead GCC documents its implementation defined
behavior as modulo-2 reduction.