From: "Paulo J. Matos" <paulo@matos-sorge.com>
To: gcc@gcc.gnu.org
Subject: Re: Move insn out of the way
Date: Wed, 10 Aug 2011 13:55:00 -0000 [thread overview]
Message-ID: <j1u2ao$83t$1@dough.gmane.org> (raw)
In-Reply-To: <CAFiYyc3279bA1svXBWGhwvgMphiLu2ap=z22UhcjWhU99ELtNg@mail.gmail.com>
On 10/08/11 12:42, Richard Guenther wrote:
>
> Oh, and I wonder if/why IRA can/does not rematerialize the constant
> instead of spilling it. Might be a cost issue that it doesn't delay
> allocating a reg for 1 as that is cheap to reload (is it?).
>
I would indeed expect IRA to move the constant assignment. However it
doesn't. The cost of a constant as per RTX_COSTS is 1 since it takes
exactly one instruction to actually do that (optimizing for size).
--
PMatos
next prev parent reply other threads:[~2011-08-10 13:55 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-10 11:20 Paulo J. Matos
2011-08-10 11:40 ` Richard Guenther
2011-08-10 11:42 ` Richard Guenther
2011-08-10 13:55 ` Paulo J. Matos [this message]
[not found] ` <4E431BD8.8060705@redhat.com>
2011-08-11 8:12 ` Paulo J. Matos
2011-08-11 8:49 ` Richard Guenther
2011-08-11 14:27 ` Vladimir Makarov
2011-08-12 10:01 ` Paulo J. Matos
2011-08-12 14:22 ` Vladimir Makarov
2011-08-12 15:06 ` Paulo J. Matos
2011-08-12 16:12 ` Jeff Law
2011-08-11 12:22 ` Paulo J. Matos
2011-08-10 13:46 ` Paulo J. Matos
2011-08-10 13:51 ` Richard Guenther
2011-08-10 14:14 ` Paulo J. Matos
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