From: "H. Peter Anvin" <hpa@zytor.com>
To: "Blower, Melanie" <melanie.blower@intel.com>
Cc: "tglx@linutronix.de" <tglx@linutronix.de>,
"mingo@redhat.com" <mingo@redhat.com>,
"avi@redhat.com" <avi@redhat.com>,
"x86@kernel.org" <x86@kernel.org>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: PROBLEM: compilation issue, inline assembly arch/x86/kvm/emulate.c fails at -O0
Date: Wed, 14 Nov 2012 16:14:11 -0800 [thread overview]
Message-ID: <50A433D3.6090301@zytor.com> (raw)
In-Reply-To: <B3584E72CFEBED439A3ECA9BCE67A4EF1B17AF90@FMSMSX107.amr.corp.intel.com>
On 11/14/2012 11:45 AM, Blower, Melanie wrote:
> [1.] gcc -O0 assembly arch/x86/kvm/emulate.c gets compilation failure -- incorrect register restrictions
> [2.] Full description of the problem/report:
> I'm trying to compile this file at -O0, but gcc chokes in register allocation at the inline assembly.
>
> In the ordinary Linux build, this file compiles with gcc at -O2, without compilation errors.
Compiling with -O0 is not really expected to work (although -O1 *is*),
although what you are reporting is an actual bug ("+a" : "a" should
either be "+a" or "=a" : "a").
-hpa
--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.
next prev parent reply other threads:[~2012-11-15 0:14 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-14 19:45 PROBLEM: compilation issue, inline assembly arch/x86/kvm/emulate.c fails at -O0 Blower, Melanie
2012-11-15 0:14 ` H. Peter Anvin [this message]
2012-11-15 15:09 ` Blower, Melanie
2012-11-15 15:09 ` Blower, Melanie
2012-11-21 21:35 ` H. Peter Anvin
2012-11-21 22:31 ` Blower, Melanie
2012-11-21 22:31 ` Blower, Melanie
2012-11-21 22:41 ` [PATCH] x86, kvm: Remove incorrect redundant assembly constraint H. Peter Anvin
2012-11-26 7:22 ` Paolo Bonzini
2012-11-26 22:48 ` H. Peter Anvin
2012-11-26 23:48 ` Marcelo Tosatti
2012-11-26 23:49 ` H. Peter Anvin
2012-11-27 0:53 ` Marcelo Tosatti
2012-11-27 0:01 ` [tip:x86/urgent] " tip-bot for H. Peter Anvin
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