linux-kernel - Re: [LLVMdev] [PATCH] x86/asm: avoid mnemonics without type suffix

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Date:	Sun, 14 Jul 2013 12:49:44 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Tim Northover <t.p.northover@...il.com>
Cc:	Ramkumar Ramachandra <artagnon@...il.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Andi Kleen <ak@...ux.intel.com>,
	LKML <linux-kernel@...r.kernel.org>,
	LLVMdev <llvmdev@...uiuc.edu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [LLVMdev] [PATCH] x86/asm: avoid mnemonics without type suffix

On Sun, Jul 14, 2013 at 12:30 PM, Tim Northover <t.p.northover@...il.com> wrote:
>
> I don't think you've actually tested that, have you? (x86-64)

Oh, you're right, for constants > 5 bits you have that other thing
going on. I didn't think about the fact that the constant changed in
the middle of the thread (it started out as 1).

We use the gcc constraint "I" (0-31) in the kernel for this reason.

             Linus
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