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Re: Crazy compiler optimization
- From: Jonathan Wakely <jwakely dot gcc at gmail dot com>
- To: vijay nag <vijunag at gmail dot com>
- Cc: "gcc-help at gcc dot gnu dot org" <gcc-help at gcc dot gnu dot org>
- Date: Wed, 9 Oct 2013 11:16:26 +0100
- Subject: Re: Crazy compiler optimization
- Authentication-results: sourceware.org; auth=none
- References: <CAKhyrx_1m0K868TVXg8kwo+EhbB+VFV0RkPqDHJ+FA8BV4w4Gw at mail dot gmail dot com> <CAH6eHdTouwYdhn4H6OEZJy2CEirb9oxYejg5q_CtPQmwVo3YmQ at mail dot gmail dot com> <CAKhyrx-A7pLK1OEiNDuMNJT75tErLBk0MHNnPxuxo=RyM7p=4g at mail dot gmail dot com>
On 9 October 2013 11:02, vijay nag wrote:
> Alright that is perfectly valid behaviour. Why does compiler consider
> it to be a unsigned type at optimization level zero ?
It doesn't.
> i.e. I see a
> wrap around after
> -128 to 128 ?
Because undefined behaviour.