linux-kernel - Re: [RFC] gcc feature request: Moving blocks into sections

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Date:	Mon, 5 Aug 2013 21:40:10 +0200
From:	Marek Polacek <polacek@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>, gcc <gcc@....gnu.org>,
	Ingo Molnar <mingo@...nel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	David Daney <ddaney.cavm@...il.com>,
	Behan Webster <behanw@...verseincode.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Herbert Xu <herbert@...dor.hengli.com.au>
Subject: Re: [RFC] gcc feature request: Moving blocks into sections

On Mon, Aug 05, 2013 at 11:34:55AM -0700, Linus Torvalds wrote:
> On Mon, Aug 5, 2013 at 11:24 AM, Linus Torvalds
> <torvalds@...ux-foundation.org> wrote:
> >
> > Ugh. I can see the attraction of your section thing for that case, I
> > just get the feeling that we should be able to do better somehow.
> 
> Hmm.. Quite frankly, Steven, for your use case I think you actually
> want the C goto *labels* associated with a section. Which sounds like
> it might be a cleaner syntax than making it about the basic block
> anyway.

FWIW, we also support hot/cold attributes for labels, thus e.g.

  if (bar ()) 
    goto A;
  /* ... */
A: __attribute__((cold))
  /* ... */

I don't know whether that might be useful for what you want or not though...

	Marek
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