------- Comment #23 from joseph at codesourcery dot com 2009-04-11 16:30
-------
Subject: Re: [4.3/4.4/4.5 Regression] operand of pre-/postin-/decrement
not promoted
On Sat, 11 Apr 2009, rguenth at gcc dot gnu dot org wrote:
> On no-undefined-overflow branch the FE can do the increment/decrement on the
> target type safely (well, there are no NV variants of the
> {PRE,POST}{IN,DEC}REMENT
> expressions on the branch, so they at the moment all get lowered to
> possibly wrapping variants during gimplification).
Of course increment/decrement of signed integer types at least as wide as
int should get lowered to the no-overflow variants unless -fwrapv;
likewise increment/decrement of pointer types. Whether through a
gimplification-time hook or through creating NV variants of
increment/decrement and having the front end create those when
appropriate.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35634
