linux-kernel - Re: inline asm semantics: output constraint width smaller than input

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Message-ID: <20090123183019.GA5984@elte.hu>
Date:	Fri, 23 Jan 2009 19:30:19 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Török Edwin <edwintorok@...il.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: inline asm semantics: output constraint width smaller than
	input


* Török Edwin <edwintorok@...il.com> wrote:

> Having said that, llvm-gcc is not yet able to compile the full Linux 
> kernel on its own [for example the boot code, due to asm(".code16gcc")], 
> but with LLVM 2.4 it was possible to build "arch=UM", and "arch=X86" (by 
> using gcc to build the bootcode). I'd like LLVM 2.5 to be able to build 
> the kernel, so I'll file bugs for llvm/kernel depending on where the 
> problem is.

Could we get LLVM folks on the Cc: and see how difficult it would be to 
fix this on the LLVM side? Asm constraints are used all around the place 
and different input/output types are very common.

	Ingo
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