linux-kernel - Re: [PATCH 2/3] time: allow gcc to fold constants when using msecs_to

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Date:	Sun, 05 Apr 2015 21:33:43 -0700
From:	Joe Perches <joe@...ches.com>
To:	Nicholas Mc Guire <der.herr@...r.at>
Cc:	Nicholas Mc Guire <hofrat@...dl.org>,
	Michal Marek <mmarek@...e.cz>,
	Masahiro Yamada <yamada.m@...panasonic.com>,
	Sam Ravnborg <sam@...nborg.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Alvin" <hpa@...or.com>,
	John Stultz <john.stultz@...aro.org>,
	Andrew Hunter <ahh@...gle.com>, Paul Turner <pjt@...gle.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] time: allow gcc to fold constants when using
 msecs_to_jiffies

On Mon, 2015-04-06 at 06:26 +0200, Nicholas Mc Guire wrote:
> On Sun, 05 Apr 2015, Joe Perches wrote:
> > Try it and look at the generated .lst files with and
> > without the patch I sent.
[]
> from all that I understood it should
> be doable both as macro and inline.

I think it _should_ be doable too but I also think
the only reason gcc doesn't optimize the inline
is because gcc's optimizer isn't good enough yet.


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