From: Peter Bergner <bergner@linux.ibm.com>
To: Jojo R <rjiejie@linux.alibaba.com>, GCC Development <gcc@gcc.gnu.org>
Subject: Re: How to describe ‘earlyclobber’ explicitly for specific source operand ?
Date: Fri, 19 Nov 2021 15:54:49 -0600 [thread overview]
Message-ID: <0a17063d-9c7b-718c-ddae-7a5d96016953@linux.ibm.com> (raw)
In-Reply-To: <1b032580-97c7-41c5-9930-9a7354ae4151@Spark>
On 11/19/21 1:28 AM, Jojo R via Gcc wrote:
> We know gcc supply earlyclobber function to avoid register overlap,
>
> but it can not describe explicitly for specific source operand, is it right ?
You add the early clobber to the OUTPUT operand(s) that can clobber any of the
input source operands. You don't mark the source operands that could be clobbered.
Peter
next prev parent reply other threads:[~2021-11-19 21:54 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <eb109969-0133-49eb-b392-b35a065f12ba@Spark>
2021-11-19 7:28 ` Jojo R
2021-11-19 21:54 ` Peter Bergner [this message]
2021-11-22 6:40 ` Jojo R
2021-11-23 12:22 ` Richard Earnshaw
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