From: Bernd Schmidt <bschmidt@redhat.com>
To: Bernd Edlinger <bernd.edlinger@hotmail.de>,
"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 11:06:00 -0000 [thread overview]
Message-ID: <56680B27.5090405@redhat.com> (raw)
In-Reply-To: <VI1PR07MB09116C40BE502A341AE0CB9EE4E80@VI1PR07MB0911.eurprd07.prod.outlook.com>
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,
> ... or should I wait for the next stage1?
I think that would be better.
Bernd
next prev parent reply other threads:[~2015-12-09 11:06 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 [this message]
2015-12-09 15:09 ` Bernd Edlinger
2015-12-09 15:48 ` Bernd Schmidt
2015-12-09 16:32 ` Bernd Edlinger
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