linux-kernel - Re: [PATCH] x86: Optimize variable_test

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Message-ID: <20150502124334.GL5029@twins.programming.kicks-ass.net>
Date:	Sat, 2 May 2015 14:43:34 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Vladimir Makarov <vmakarov@...hat.com>
Cc:	Jakub Jelinek <jakub@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Richard Henderson <rth@...hat.com>,
	Ingo Molnar <mingo@...nel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH] x86: Optimize variable_test_bit()

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.
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