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From: Kyrill Tkachov <kyrylo.tkachov@arm.com>
To: GCC Patches <gcc-patches@gcc.gnu.org>
Cc: Ramana Radhakrishnan <Ramana.Radhakrishnan@arm.com>,
	 Richard Earnshaw <Richard.Earnshaw@arm.com>
Subject: Re: [PATCH][ARM] Do not lower cost of setting core reg to constant. It doesn't have any effect
Date: Thu, 30 Apr 2015 12:00:00 -0000	[thread overview]
Message-ID: <554218FE.2000102@arm.com> (raw)
In-Reply-To: <5537C9B9.5090501@arm.com>

Ping.
https://gcc.gnu.org/ml/gcc-patches/2015-04/msg01330.html

Thanks,
Kyrill

On 22/04/15 17:18, Kyrill Tkachov wrote:
> Hi all,
>
> This hunk that slightly reduces the cost of immediate moves doesn't actually have any effect.
> In the whole of SPEC2006 it didn't make a difference. In any case, I'd like to move to a point
> where we use COSTS_N_INSNS units for our costs and not increment decrement them by one.
>
> This patch removes that bit of logic and makes it slightly cleaner to look at. As far as I know
> its logic has never been confirmed in practice.
>
> Bootstrapped and tested on arm.
>
> Ok for trunk?
>
> Thanks,
> Kyrill
>
> 2015-04-22  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
>
>       * config/arm/arm.c (arm_new_rtx_costs): Do not lower cost
>       immediate moves.

  reply	other threads:[~2015-04-30 11:59 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-04-22 16:18 Kyrill Tkachov
2015-04-30 12:00 ` Kyrill Tkachov [this message]
2015-04-30 15:25 ` Marcus Shawcroft
2015-04-30 15:34   ` Marcus Shawcroft
2015-05-06  7:15 ` Richard Sandiford
2015-05-06  8:13   ` Kyrill Tkachov

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