From: Vladimir Makarov <vmakarov@redhat.com>
To: 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>, "H. Peter Anvin" <hpa@zytor.com>,
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 14:07:32 -0400 [thread overview]
Message-ID: <5547B564.3050901@redhat.com> (raw)
In-Reply-To: <20150502124334.GL5029@twins.programming.kicks-ass.net>
On 02/05/15 08:43 AM, Peter Zijlstra wrote:
> On Fri, May 01, 2015 at 03:02:24PM -0400, Vladimir Makarov wrote:
>> Currently LRA is used by x86/x86-64, ARM, AARCH64, s390, and MIPS.
>> PPC, SH, and ARC are moving to LRA. All other targets are still
>> reload based.
>>
>> 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 ...
next prev parent reply other threads:[~2015-05-04 18:07 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 [this message]
2015-05-04 20:14 ` H. Peter Anvin
2015-05-04 13:42 ` Peter Zijlstra
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