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From: Bernd Edlinger <bernd.edlinger@hotmail.de>
To: Bernd Schmidt <bschmidt@redhat.com>,
	"gcc-patches@gcc.gnu.org"	<gcc-patches@gcc.gnu.org>
Cc: Richard Biener <rguenther@suse.de>, Jeff Law <law@redhat.com>
Subject: Re: [PATCH] Make basic asm implicitly clobber memory, pr24414
Date: Wed, 09 Dec 2015 15:09:00 -0000	[thread overview]
Message-ID: <VI1PR07MB0911C236A0B2C0ED1C2477C4E4E80@VI1PR07MB0911.eurprd07.prod.outlook.com> (raw)
In-Reply-To: <56680B27.5090405@redhat.com>

Hi,

On 09.12.2015 12:06 Bernd Schmidt wrote:
> On 12/09/2015 03:18 AM, Bernd Edlinger wrote:
>> Furthermore there is a documented use for asm(""): The empty 
>> assembler string is used to make a function
>> volatile, thus calls can not be optimized away.  But I think it is 
>> not necessary to make this clobber anything,
>> nor should it be an instruction scheduling barrier, as it used to be 
>> in the past.
>
> Making that change seems risky; best not to make assumptions about how 
> these are used. In any case,
>

So would you agree on the general direction of the patch,
if I drop the hunk in sched-deps.c ?


Thanks
Bernd.

  reply	other threads:[~2015-12-09 15:09 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-12-09  2:18 Bernd Edlinger
2015-12-09 11:06 ` Bernd Schmidt
2015-12-09 15:09   ` Bernd Edlinger [this message]
2015-12-09 15:48     ` Bernd Schmidt
2015-12-09 16:32       ` Bernd Edlinger

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