From: Richard Henderson <rth@redhat.com>
To: Alexandre Oliva <aoliva@redhat.com>
Cc: ubizjak@gmail.com, Aldy Hernandez <aldyh@redhat.com>,
gcc-patches@gcc.gnu.org
Subject: Re: [PR55547] fix alias regression on alpha on misaligned symbols
Date: Thu, 17 Jan 2013 17:05:00 -0000 [thread overview]
Message-ID: <50F82F3F.5050901@redhat.com> (raw)
In-Reply-To: <ortxqg4jma.fsf@livre.localdomain>
On 2013-01-16 18:40, Alexandre Oliva wrote:
>> That said, I question the change of <= to == 0. If negative, we don't
>> know how much overlap there is as far as I can see.
>
> Why not? Since the addresses are constants, and the negative sizes are
> just the adjusted sizes, negated to indicate they were conservatively
> lengthened by an alignment operation...
Oh, right.
>> This hunk is not needed, as we begin by eliminating <= 0. So the abs
>> is certain to do nothing.
>
> The function I'll introduce to keep the expressions the same will have
> the abs and I'll use it here, but you're right that after testing for
> negative sizes they abses won't make much of a difference.
Sure.
r~
next prev parent reply other threads:[~2013-01-17 17:05 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <50F582CE.3090201@redhat.com>
[not found] ` <50F585DB.2020706@redhat.com>
2013-01-16 4:30 ` [PR55547] fix alias regression on alpha on misaligned symbols (was: Re: do you have time to review this alpha P1 patch?) Alexandre Oliva
2013-01-16 7:34 ` Uros Bizjak
2013-01-16 19:35 ` Uros Bizjak
2013-01-18 11:13 ` [PR55547] fix alias regression on alpha on misaligned symbols Alexandre Oliva
2013-01-16 19:54 ` Richard Henderson
2013-01-17 2:41 ` Alexandre Oliva
2013-01-17 17:05 ` Richard Henderson [this message]
2013-01-17 4:16 ` Alexandre Oliva
2013-01-17 17:07 ` Richard Henderson
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