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[Bug c/39311] Optimization breaks existing overflow checks
- From: "rguenth at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 26 Feb 2009 14:28:20 -0000
- Subject: [Bug c/39311] Optimization breaks existing overflow checks
- References: <bug-39311-17369@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #1 from rguenth at gcc dot gnu dot org 2009-02-26 14:28 -------
In C signed overflow invokes undefined behavior so the compiler assumes signed
operations do not overflow. Use -fwrapv or -fno-strict-overflow if you like
to program in DWIM-C.
--
rguenth at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution| |INVALID
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39311