From: "William J. Schmidt" <wschmidt@linux.vnet.ibm.com>
To: Richard Henderson <rth@redhat.com>
Cc: Richard Guenther <rguenther@suse.de>, gcc-patches@gcc.gnu.org
Subject: Re: [PATCH][RFC][1/2] Bitfield lowering, add BIT_FIELD_EXPR
Date: Mon, 20 Jun 2011 14:23:00 -0000 [thread overview]
Message-ID: <1308579588.5273.1.camel@oc2474580526.ibm.com> (raw)
In-Reply-To: <4DFA3421.6020603@redhat.com>
On Thu, 2011-06-16 at 09:49 -0700, Richard Henderson wrote:
> On 06/16/2011 04:35 AM, Richard Guenther wrote:
> >
> > + /* Bit-field insertion needs several shift and mask operations. */
> > + case BIT_FIELD_EXPR:
> > + return 3;
>
> ... depending on the target, of course.
>
Agreed -- this is a single-instruction operation on PowerPC. Probably
need some target-specific weights here.
>
>
> r~
next prev parent reply other threads:[~2011-06-20 14:20 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-16 11:46 Richard Guenther
2011-06-16 12:06 ` Jay Foad
2011-06-16 17:18 ` Richard Henderson
2011-06-16 18:10 ` Eric Botcazou
2011-06-16 19:23 ` Richard Guenther
2011-06-16 19:53 ` Richard Henderson
2011-06-20 14:23 ` William J. Schmidt [this message]
2011-06-20 19:09 ` Andrew Pinski
2011-06-20 21:03 ` Richard Guenther
2011-06-20 21:05 ` Andrew Pinski
2011-06-19 23:45 ` William J. Schmidt
2011-06-20 13:44 ` Michael Matz
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