From: Ilya Enkovich <enkovich.gnu@gmail.com>
To: Jakub Jelinek <jakub@redhat.com>
Cc: "William J. Schmidt" <wschmidt@linux.vnet.ibm.com>,
gcc-patches@gcc.gnu.org
Subject: Re: [PATCH Atom][PR middle-end/44382] Tree reassociation improvement
Date: Wed, 13 Jul 2011 09:04:00 -0000 [thread overview]
Message-ID: <CAMbmDYa64_sdXRgHHr5RvpRH+8DpdJDVsQ-B2NiTdTxzsQUeog@mail.gmail.com> (raw)
In-Reply-To: <20110713081253.GS2687@tyan-ft48-01.lab.bos.redhat.com>
>
> Well, if it is clearly a win to reassociate, you can always reassociate
> them by doing arithmetics in corresponding unsigned type and afterwards
> converting back to the signed type.
>
> Jakub
>
You are right. But in this case we again make all operands have
wrap-around type and thus disable some other optimization. It would be
nice to have opportunity to reassociate and still have undefined
behavior on overflow for optimizations. One way to do it for add/sub
is to use wider type (long long instead of int).
Ilya
next prev parent reply other threads:[~2011-07-13 9:02 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-12 12:35 Илья Энкович
2011-07-12 17:08 ` William J. Schmidt
2011-07-12 17:22 ` H.J. Lu
2011-07-13 8:28 ` Ilya Enkovich
2011-07-12 17:24 ` William J. Schmidt
2011-07-13 8:13 ` Ilya Enkovich
2011-07-13 8:30 ` Jakub Jelinek
2011-07-13 9:04 ` Ilya Enkovich [this message]
2011-07-13 9:52 ` Jakub Jelinek
2011-07-13 9:59 ` Ilya Enkovich
2011-07-13 11:01 ` Richard Guenther
2011-07-13 13:11 ` William J. Schmidt
2011-07-13 18:05 ` Michael Meissner
2011-07-13 20:18 ` Ilya Enkovich
2011-07-14 2:39 ` Michael Meissner
2011-07-14 9:40 ` Richard Guenther
2011-07-14 9:42 ` Richard Guenther
2011-07-14 10:04 ` Ilya Enkovich
2011-07-14 10:14 ` Richard Guenther
2011-07-14 11:03 ` Ilya Enkovich
2011-07-14 15:31 ` Ilya Enkovich
2011-07-19 12:10 ` Richard Guenther
2011-07-19 15:25 ` Ilya Enkovich
2011-08-05 11:46 ` Richard Guenther
2011-08-05 15:08 ` Ilya Enkovich
2011-08-10 15:19 ` Ilya Enkovich
2011-08-19 9:09 ` Ilya Enkovich
2011-08-26 11:45 ` Ilya Enkovich
2011-08-30 13:16 ` Richard Guenther
2011-08-31 15:38 ` Ilya Enkovich
2011-09-01 9:24 ` Richard Guenther
2011-09-01 10:28 ` Ilya Enkovich
2011-09-02 12:53 ` Uros Bizjak
2011-09-02 13:07 ` Richard Guenther
2011-09-02 13:46 ` Ilya Enkovich
2011-09-02 14:01 ` Richard Guenther
2011-09-02 14:13 ` Ilya Enkovich
2011-09-06 12:40 ` Ilya Enkovich
2011-09-06 15:53 ` Uros Bizjak
2011-09-06 16:18 ` Ilya Enkovich
2011-09-06 16:45 ` H.J. Lu
2011-07-26 9:54 ` Ilya Enkovich
2011-08-03 8:35 ` Ilya Enkovich
2011-07-21 20:14 ` Joseph S. Myers
2011-07-14 16:04 ` Michael Meissner
2011-07-14 16:08 ` Ilya Enkovich
2011-07-14 10:38 ` Ilya Enkovich
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