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[Bug target/36713] [4.4 regression] r137252 breaks -O2 optimization on x86_64-unknown-linux-gnu
- From: "rguenther at suse dot de" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 3 Jul 2008 19:44:51 -0000
- Subject: [Bug target/36713] [4.4 regression] r137252 breaks -O2 optimization on x86_64-unknown-linux-gnu
- References: <bug-36713-13648@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #18 from rguenther at suse dot de 2008-07-03 19:44 -------
Subject: Re: [4.4 regression] r137252 breaks -O2 optimization
on x86_64-unknown-linux-gnu
On Thu, 3 Jul 2008, franke dot daniel at gmail dot com wrote:
> ------- Comment #17 from franke dot daniel at gmail dot com 2008-07-03 19:33 -------
> Subject: Re: [4.4 regression] r137252 breaks -O2 optimization on
> x86_64-unknown-linux-gnu
>
>
>> Well, the circumstances where the miscompilation occurs may be tricky.
>> So you say you have a testcase but that doesn't show wrong behavior?
>> That's unfortunate ... :/
>
> There was this small glimmer of hope that you could tell from the assembly
> difference that something's horribly, horribly wrong and you know perfectly
> well how to fix it. No? :)
No, sorry - this is just how a sibcall looks like ;)
> A properly failing testcase might take a while ...
Understood ...
Richard.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36713