From: Andrea Corallo <andrea.corallo@arm.com>
To: Segher Boessenkool <segher@kernel.crashing.org>
Cc: gcc-patches@gcc.gnu.org, nd@arm.com,
Richard Earnshaw <richard.earnshaw@arm.com>
Subject: Re: [PATCH 1/2] Add new RTX instruction class FILLER_INSN
Date: Wed, 19 Aug 2020 19:47:29 +0200 [thread overview]
Message-ID: <gkrpn7msf2m.fsf@arm.com> (raw)
In-Reply-To: <20200819165136.GR28786@gate.crashing.org> (Segher Boessenkool's message of "Wed, 19 Aug 2020 11:51:36 -0500")
Segher Boessenkool <segher@kernel.crashing.org> writes:
> [ Please don't post new patch series as replies to old ]
>
> On Wed, Jul 22, 2020 at 12:02:33PM +0200, Andrea Corallo wrote:
>> This first patch implements the addition of a new RTX instruction class
>> FILLER_INSN, which has been white listed to allow placement of NOPs
>> outside of a basic block. This is to allow padding after unconditional
>> branches. This is favorable so that any performance gained from
>> diluting branches is not paid straight back via excessive eating of
>> nops.
>>
>> It was deemed that a new RTX class was less invasive than modifying
>> behavior in regards to standard UNSPEC nops.
>
> Deemed, by whom? There are several people very against it, too. You
> need to modify only one simple behaviour (maybe in a handful of places),
> making a new RTX class for that is excessive.
Hi Segher,
That's understood and agreed. I haven't posted any new patch on this,
the quoted mail is an old one. I just wanted to discuss how to proceede
this way with my mail of today.
Thanks for your feedback!
Andrea
prev parent reply other threads:[~2020-08-19 17:47 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-22 10:02 Andrea Corallo
2020-07-22 10:09 ` [PATCH 2/2] Aarch64: Add branch diluter pass Andrea Corallo
2020-07-22 10:39 ` Andrew Pinski
2020-07-22 13:53 ` Andrea Corallo
2020-07-22 16:43 ` Segher Boessenkool
2020-07-22 19:45 ` Andrea Corallo
2020-07-23 22:47 ` Segher Boessenkool
2020-07-24 7:01 ` Andrea Corallo
2020-07-24 11:53 ` Segher Boessenkool
2020-07-24 13:21 ` Andrea Corallo
2020-07-24 22:09 ` Segher Boessenkool
2020-07-28 18:55 ` Andrea Corallo
2020-07-28 22:07 ` Segher Boessenkool
2020-07-22 12:24 ` [PATCH 1/2] Add new RTX instruction class FILLER_INSN Richard Biener
2020-07-22 13:16 ` Richard Earnshaw (lists)
2020-07-22 14:51 ` Andrea Corallo
2020-07-22 18:41 ` Joseph Myers
2020-07-24 21:18 ` Segher Boessenkool
2020-07-26 18:19 ` Eric Botcazou
2020-07-28 19:29 ` Andrea Corallo
2020-08-19 9:13 ` Andrea Corallo
2020-08-19 10:52 ` Richard Sandiford
2020-08-19 17:28 ` Segher Boessenkool
2020-08-19 16:51 ` Segher Boessenkool
2020-08-19 17:47 ` Andrea Corallo [this message]
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