From: Hans-Peter Nilsson <hp@bitrange.com>
To: Alan Modra <amodra@gmail.com>
Cc: Segher Boessenkool <segher@kernel.crashing.org>, gcc-patches@gcc.gnu.org
Subject: Re: [PATCH 2/8] [RS6000] rs6000_rtx_costs for AND
Date: Fri, 23 Oct 2020 19:18:44 -0400 (EDT) [thread overview]
Message-ID: <alpine.BSF.2.20.16.2010231912440.85374@arjuna.pair.com> (raw)
In-Reply-To: <20201021221150.GF4898@bubble.grove.modra.org>
On Thu, 22 Oct 2020, Alan Modra via Gcc-patches wrote:
Hi!
> On Wed, Oct 21, 2020 at 03:29:11PM -0500, Segher Boessenkool wrote:
> > Anyway:
> >
> > + || (outer_code == AND
> > + && rs6000_is_valid_2insn_and (x, mode)))
> > {
> > *total = COSTS_N_INSNS (1);
> > return true;
> >
> > It should return COSTS_N_INSNS (2) for that?
>
> No, it should not!
>
> /* (reg) is costed at zero by rtlanal.c:rtx_cost. That sets a
> baseline for rtx costs: If a constant is valid in an insn,
> it is free. */
From where is this quote? My "git grep" fails to find it for me
(on master). It seems like a port-specific commment so I'd
have expected to find it somewhere in config/rs6000.
brgds, H-P
next prev parent reply other threads:[~2020-10-23 23:18 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-07 22:57 [PATCH 0/8] [RS6000] rs6000_rtx_costs V2 Alan Modra
2020-10-07 22:57 ` [PATCH 1/8] [RS6000] rs6000_rtx_costs comment Alan Modra
2020-10-14 20:08 ` Segher Boessenkool
2020-10-07 22:57 ` [PATCH 2/8] [RS6000] rs6000_rtx_costs for AND Alan Modra
2020-10-20 18:55 ` Segher Boessenkool
2020-10-21 2:57 ` Alan Modra
2020-10-21 20:29 ` Segher Boessenkool
2020-10-21 22:11 ` Alan Modra
2020-10-22 13:29 ` Segher Boessenkool
2020-10-23 23:18 ` Hans-Peter Nilsson [this message]
2020-10-24 1:04 ` Alan Modra
2020-10-07 22:57 ` [PATCH 3/8] [RS6000] rs6000_rtx_costs tidy AND Alan Modra
[not found] ` <20210112033157.GA26219@bubble.grove.modra.org>
2021-01-21 23:09 ` Alan Modra
2021-01-25 22:37 ` Segher Boessenkool
2021-02-01 2:06 ` Alan Modra
2020-10-07 22:57 ` [PATCH 4/8] [RS6000] rs6000_rtx_costs tidy break/return Alan Modra
[not found] ` <20210112033209.GB26219@bubble.grove.modra.org>
2021-01-21 23:09 ` Alan Modra
2021-01-25 22:40 ` Segher Boessenkool
2020-10-07 22:57 ` [PATCH 5/8] [RS6000] rs6000_rtx_costs cost IOR Alan Modra
[not found] ` <20210112033218.GC26219@bubble.grove.modra.org>
2021-01-21 23:10 ` Alan Modra
2021-01-25 22:51 ` Segher Boessenkool
2021-02-01 2:13 ` Alan Modra
2020-10-07 22:57 ` [PATCH 6/8] [RS6000] rs6000_rtx_costs multi-insn constants Alan Modra
2020-10-07 22:57 ` [PATCH 7/8] [RS6000] rs6000_rtx_costs reduce cost for SETs Alan Modra
2020-10-08 18:19 ` will schmidt
[not found] ` <20210112033227.GD26219@bubble.grove.modra.org>
2021-01-21 23:10 ` Alan Modra
2020-10-07 22:58 ` [PATCH 8/8] [RS6000] rs6000_rtx_costs for !speed Alan Modra
[not found] ` <20210112033236.GE26219@bubble.grove.modra.org>
2021-01-21 23:11 ` Alan Modra
2020-12-05 9:12 ` [PATCH 0/8] [RS6000] rs6000_rtx_costs V2 Alan Modra
2021-01-11 21:42 ` Alan Modra
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=alpine.BSF.2.20.16.2010231912440.85374@arjuna.pair.com \
--to=hp@bitrange.com \
--cc=amodra@gmail.com \
--cc=gcc-patches@gcc.gnu.org \
--cc=segher@kernel.crashing.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).