netdev - RE: [PATCH RFCv3 08/14] arm64: introduce aarch64_insn_gen

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Message-ID: <063D6719AE5E284EB5DD2968C1650D6D17274D55@AcuExch.aculab.com>
Date:	Wed, 16 Jul 2014 16:25:35 +0000
From:	David Laight <David.Laight@...LAB.COM>
To:	'Will Deacon' <will.deacon@....com>,
	Zi Shen Lim <zlim.lnx@...il.com>
CC:	Catalin Marinas <Catalin.Marinas@....com>,
	Jiang Liu <liuj97@...il.com>,
	AKASHI Takahiro <takahiro.akashi@...aro.org>,
	"David S. Miller" <davem@...emloft.net>,
	Daniel Borkmann <dborkman@...hat.com>,
	"Alexei Starovoitov" <ast@...mgrid.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [PATCH RFCv3 08/14] arm64: introduce aarch64_insn_gen_movewide()

From: Will Deacon
...
> > +	BUG_ON(imm < 0 || imm > 65535);
> 
> Do this check with masking instead?

The compiler will convert that to a single unsigned comparison.

...
> > +		BUG_ON(shift != 0 && shift != 16 && shift != 32 &&
> > +		       shift != 48);

OTOH I don't think it will convert that to:
		BUG_ON(shift & ~48);

	David



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