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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] Fix costing of vmul+vcvt combine pattern
Date: Tue, 03 Nov 2015 10:22:00 -0000	[thread overview]
Message-ID: <56388AC8.2020208@arm.com> (raw)
In-Reply-To: <562F8257.6080006@arm.com>

Ping.
https://gcc.gnu.org/ml/gcc-patches/2015-10/msg02898.html

Thanks,
Kyrill

On 27/10/15 13:55, Kyrill Tkachov wrote:
> Hi all,
>
> This patch allows us to handle the *combine_vcvtf2i pattern in rtx costs by properly identifying it
> as a toint coversion. Before this I saw a pattern like:
> (set (reg/i:SI 0 r0)
>     (fix:SI (fix:SF (mult:SF (reg:SF 16 s0 [ a ])
>                 (const_double:SF 3.2e+1 [0x0.8p+6])))))
>
> being assigned a cost of 40 because the costs blindly recursed into the operands.
> With this patch for -mcpu=cortex-a57 I see it being assigned a cost of 4.
>
> Bootstrapped and tested on arm-none-linux-gnueabihf.
>
> Ok for trunk?
>
> Thanks,
> Kyrill
>
> 2015-10-27  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
>
>     * config/arm/arm.c (arm_new_rtx_costs, FIX case): Handle
>     combine_vcvtf2i pattern.

  reply	other threads:[~2015-11-03 10:22 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-10-27 14:02 Kyrill Tkachov
2015-11-03 10:22 ` Kyrill Tkachov [this message]
2015-11-10 14:13 ` Ramana Radhakrishnan

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