linux-kernel - Re: [PATCH v2 0/7] Optimize jump label implementation on ARM64

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Message-ID: <20131014164134.GP10491@mudshark.cambridge.arm.com>
Date:	Mon, 14 Oct 2013 17:41:34 +0100
From:	Will Deacon <will.deacon@....com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Jiang Liu <liuj97@...il.com>, Steven Rostedt <rostedt@...dmis.org>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Sandeepa Prabhu <sandeepa.prabhu@...aro.org>,
	Jiang Liu <jiang.liu@...wei.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 0/7] Optimize jump label implementation on ARM64

On Mon, Oct 14, 2013 at 05:04:20PM +0100, Russell King - ARM Linux wrote:
> > On 10/14/2013 11:40 PM, Russell King - ARM Linux wrote:
> |  In the simplest case, a `%' followed by a digit N says to output
> | operand N at that point in the string.
> | 
> |  `%' followed by a letter and a digit says to output an operand in an
> | alternate fashion.  Four letters have standard, built-in meanings
> | described below.  The machine description macro `PRINT_OPERAND' can
> | define additional letters with nonstandard meanings.
> | 
> |  `%cDIGIT' can be used to substitute an operand that is a constant
> | value without the syntax that normally indicates an immediate operand.
> | ...
> |  `%lDIGIT' is used to substitute a `label_ref' into a jump instruction.
> 
> %lDIGIT is used (but not commented upon) in the gcc extended asm
> documentation where it talks about asm gotos, so there's probably a doc
> bug here too about whether these options should be described in the
> main doc as well.
> 
> Nevertheness, this section is documenting the _internals_ of gcc, and
> it seems perverse for a gcc backend to ignore something that is
> documented as being a standard part of gcc.

I'll make sure this gets fixed.

Will
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