This is the mail archive of the gcc-patches@gcc.gnu.org mailing list for the GCC project.

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]
Other format:	[Raw text]

Re: X /[ex] 4 < Y /[ex] 4

From: Richard Biener <richard dot guenther at gmail dot com>
To: Marc Glisse <marc dot glisse at inria dot fr>
Cc: Jakub Jelinek <jakub at redhat dot com>, GCC Patches <gcc-patches at gcc dot gnu dot org>
Date: Mon, 24 Apr 2017 09:45:07 +0200
Subject: Re: X /[ex] 4 < Y /[ex] 4
Authentication-results: sourceware.org; auth=none
References: <alpine.DEB.2.02.1704240822550.6994@stedding.saclay.inria.fr> <20170424064203.GE1809@tucnak> <alpine.DEB.2.20.1704240903420.1803@stedding.saclay.inria.fr>

On Mon, Apr 24, 2017 at 9:04 AM, Marc Glisse <marc.glisse@inria.fr> wrote:
> On Mon, 24 Apr 2017, Jakub Jelinek wrote:
>
>>> +/* X / 4 < Y / 4 iif X < Y when the division is known to be exact.  */
>>
>>
>> s/iif/iff/ ?
>
>
> Indeed, thanks, I've fixed it locally.

Ok.

As of strict-overflow warnings I'd like to kill -f[no-]strict-overflow
by aliasing
it to -f[no-]wrapv and thus removing the !TYPE_OVERFLOW_WRAPS
&& !TYPE_OVERFLOW_UNDEFINED && !TYPE_OVERFLOW_TRAPS case.

This means effectively killing -Wstrict-overflow which is IMHO reasonable
as it's quite broken plus we now have ubsan which does a better job.

Thanks,
Richard.

> --
> Marc Glisse

References:
- X /[ex] 4 < Y /[ex] 4
  - From: Marc Glisse
- Re: X /[ex] 4 < Y /[ex] 4
  - From: Jakub Jelinek
- Re: X /[ex] 4 < Y /[ex] 4
  - From: Marc Glisse

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]