linux-kernel - Re: [PATCH 02/17] x86, lto: Disable fancy hweight optimizations for LTO v2

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Message-ID: <52F67CD7.5090609@zytor.com>
Date:	Sat, 08 Feb 2014 10:52:07 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andi Kleen <ak@...ux.intel.com>, linux-kernel@...r.kernel.org
CC:	linux-kbuild@...r.kernel.org, x86@...nel.org
Subject: Re: [PATCH 02/17] x86, lto: Disable fancy hweight optimizations for
 LTO v2

On 02/08/2014 12:01 AM, Andi Kleen wrote:
> The fancy x86 hweight uses different compiler options for the
> hweight file. This does not work with LTO. Just disable the optimization
> with LTO

No, I'm going to NAK this.  This means not using the POPCNT instruction
if LTO is enabled, and that really isn't an acceptable option.

	-hpa

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