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

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Message-Id: <200901272042.57272.baldrick@free.fr>
Date:	Tue, 27 Jan 2009 20:42:56 +0100
From:	Duncan Sands <baldrick@...e.fr>
To:	llvmdev@...uiuc.edu
Cc:	Ingo Molnar <mingo@...e.hu>,
	Török Edwin <edwintorok@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>
Subject: Re: [LLVMdev] inline asm semantics: output constraint width smaller 
 than	input

Hi,

> If yes then this doesnt look all that bad or invasive at first sight (if 
> the put_user() workaround can be expressed in a cleaner way), but in any 
> case it would be nice to hear an LLVM person's opinion about roughly when 
> this is going to be solved in LLVM itself.

one thing that seems to be clear to everyone except me is... what are the
semantics supposed to be?  [My understanding is that what is being discussed
is when you have an asm with a register as input and output, but with integer
types of different width for the input and output, but I saw some mention of
struct types in this thread...].  Presumably this is something obvious, but
it would be good to have someone spell it out in small words that even someone
like me can understand :)

Thanks,

Duncan.
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