From: "H. Peter Anvin" <hpa@zytor.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: "Török Edwin" <edwintorok@gmail.com>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Linux Kernel" <linux-kernel@vger.kernel.org>
Subject: Re: inline asm semantics: output constraint width smaller than input
Date: Fri, 23 Jan 2009 10:21:49 -0800 [thread overview]
Message-ID: <497A0ABD.2090408@zytor.com> (raw)
In-Reply-To: <20090123181721.GA32545@elte.hu>
Ingo Molnar wrote:
>
>> Hi,
>>
>> I am trying to build the kernel with LLVM 2.5 prerelease (using
>> llvm-gcc-4.2 frontend), however I am running into some inline asm
>> semantics issues, and after some discussion on LLVM bugzilla I would
>> like to know if you would be accepting patches for this:
>> http://llvm.org/bugs/show_bug.cgi?id=3373
>>
>> The problem is when "a" output constraint is used with a variable of
>> smaller width than the "0" input constraint.
>>
IMO, that's an LLVM bug and should be fixed in LLVM while it is in
prerelease. That particular constraint is a serious one, and will haunt
us for many years if we allow ourselves to go down the path of having to
fix that every time it crops up.
-hpa
next prev parent reply other threads:[~2009-01-23 18:22 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-23 17:57 inline asm semantics: output constraint width smaller than input Török Edwin
2009-01-23 18:17 ` Ingo Molnar
2009-01-23 18:21 ` H. Peter Anvin [this message]
2009-01-23 18:27 ` Török Edwin
2009-01-23 18:30 ` Ingo Molnar
2009-01-23 18:52 ` Török Edwin
2009-01-23 20:42 ` Török Edwin
2009-01-24 16:23 ` Török Edwin
2009-01-24 17:27 ` Ingo Molnar
2009-01-24 18:57 ` Török Edwin
2009-01-24 21:25 ` [LLVMdev] " Mike Stump
2009-01-24 19:23 ` Chris Lattner
2009-01-24 21:10 ` H. Peter Anvin
2009-01-27 19:42 ` Duncan Sands
2009-01-27 21:25 ` H. Peter Anvin
2009-01-28 1:45 ` Kyle Moffett
2009-01-28 1:56 ` H. Peter Anvin
2009-01-28 13:28 ` Kyle Moffett
2009-01-28 17:29 ` H. Peter Anvin
2009-01-28 19:27 ` Kyle Moffett
2009-01-28 20:59 ` H. Peter Anvin
2009-01-24 20:07 ` Andreas Schwab
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