From: "H. Peter Anvin" <hpa@zytor.com>
To: Vladimir Makarov <vmakarov@redhat.com>,
Peter Zijlstra <peterz@infradead.org>
Cc: Jakub Jelinek <jakub@redhat.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Richard Henderson <rth@redhat.com>,
Ingo Molnar <mingo@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Borislav Petkov <bp@alien8.de>
Subject: Re: [PATCH] x86: Optimize variable_test_bit()
Date: Mon, 04 May 2015 13:14:59 -0700 [thread overview]
Message-ID: <5547D343.3090900@zytor.com> (raw)
In-Reply-To: <5547B564.3050901@redhat.com>
On 05/04/2015 11:07 AM, Vladimir Makarov wrote:
>>>
>>> So I could implement the output reloads in LRA, probably for the
>>> next GCC release. How to enable and mostly use it for multi-target
>>> code like the kernel is another question.
>> Pretty much all inline asm is in per arch code; so one arch having
>> different asm features than another should not be a problem at all.
> Ok, then. I'll try to implement output operands for asm-goto in LRA for
> the next GCC release.
>
> Of course, if nobody objects to changing asm goto semantics from
>
> An 'asm goto' statement cannot have outputs ...
>
> to
>
> An 'asm goto' statement cannot have outputs on some targets ...
>
A gradual implementation should be fine.
-hpa
next prev parent reply other threads:[~2015-05-04 20:15 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-01 15:16 [PATCH] x86: Optimize variable_test_bit() Peter Zijlstra
2015-05-01 16:03 ` Linus Torvalds
2015-05-01 16:16 ` Peter Zijlstra
2015-05-01 16:29 ` Peter Zijlstra
2015-05-01 16:18 ` Peter Zijlstra
2015-05-01 16:33 ` Jakub Jelinek
2015-05-01 16:45 ` Linus Torvalds
2015-05-01 16:46 ` Peter Zijlstra
2015-05-01 17:17 ` Ingo Molnar
2015-05-01 19:02 ` Vladimir Makarov
2015-05-01 20:49 ` Linus Torvalds
2015-05-01 22:22 ` Vladimir Makarov
2015-05-02 12:39 ` Peter Zijlstra
2015-05-04 15:37 ` Richard Henderson
2015-05-04 19:33 ` [RFC] Design for flag bit outputs from asms Richard Henderson
2015-05-04 20:14 ` H. Peter Anvin
2015-05-04 20:27 ` H. Peter Anvin
2015-05-04 20:33 ` Richard Henderson
2015-05-04 20:45 ` Linus Torvalds
2015-05-04 20:57 ` Richard Henderson
2015-05-04 21:23 ` H. Peter Anvin
2015-05-04 20:35 ` Linus Torvalds
2015-05-04 20:42 ` H. Peter Anvin
2015-05-05 9:01 ` Gabriel Paubert
2015-05-05 13:50 ` Segher Boessenkool
2015-05-05 15:37 ` Linus Torvalds
2015-05-05 16:10 ` Segher Boessenkool
2015-05-02 12:43 ` [PATCH] x86: Optimize variable_test_bit() Peter Zijlstra
2015-05-04 18:07 ` Vladimir Makarov
2015-05-04 20:14 ` H. Peter Anvin [this message]
2015-05-04 13:42 ` Peter Zijlstra
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