[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: (1 << -1) ?

> Date: Sat, 14 Sep 2002 16:36:04 +0200
> From: Sebastian Andersson <sa@xxxxxxx.net>

> I've noticed a difference in the semantics between gcc-2.95 and gcc-3.0
> on i386 and the cris-1.15 version of gcc-2.96.
> This lines:
> printf("%u\n", 1<<(-1));
> gives 0 the cris and 2147483648 on i386.
> Since gcc gives a warning about this, I assume the result
> is undefined in the ISO C standard, is that correct


> or
> is there a bug in the cris version of gcc?

Not in this regard.  An undefined result is undefined and the
results are valid for both ports.

Note that cris-dist-1.15 is several versions back; I advise you
to upgrade.

brgds, H-P