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

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Message-ID: <20150501163329.GU1751@tucnak.redhat.com>
Date:	Fri, 1 May 2015 18:33:29 +0200
From:	Jakub Jelinek <jakub@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Richard Henderson <rth@...hat.com>,
	Vladimir Makarov <vmakarov@...hat.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	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 09:03:32AM -0700, Linus Torvalds wrote:
> > PPS. Jakub, I see gcc5.1 still hasn't got output operands for asm goto;
> >      is this something we can get 'fixed' ?

CCing Richard as author of asm goto and Vlad as register allocator
maintainer.  There are a few enhancement requests to support this, like
http://gcc.gnu.org/PR59615 and http://gcc.gnu.org/PR52381 , but indeed the
reason why no outputs are allowed is the register allocation issue.
Don't know if LRA would be better suited to handle that case, but it would
indeed be pretty hard.

	Jakub
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