From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752603AbcD1O66 (ORCPT ); Thu, 28 Apr 2016 10:58:58 -0400 Received: from mail-db3on0072.outbound.protection.outlook.com ([157.55.234.72]:52048 "EHLO emea01-db3-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751932AbcD1O64 (ORCPT ); Thu, 28 Apr 2016 10:58:56 -0400 Authentication-Results: ucw.cz; dkim=none (message not signed) header.d=none;ucw.cz; dmarc=none action=none header.from=mellanox.com; From: Chris Metcalf Subject: Re: [PATCH] scsi: fc: force inlining of wwn conversion functions To: Arnd Bergmann , Martin Jambor References: <20160419085221.GA29087@gmail.com> <5298237.1Guzp0G04x@wuerfel> <20160427110503.GB24887@virgil.suse.cz> <4940273.pi2bWg8tAl@wuerfel> CC: "Martin K. 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We certainly could enable ARCH_USE_BUILTIN_BSWAP. The only problem is that we never added explicit support for bswap16() in gcc, which is efficiently done on tilegx via the "revbytes" instruction and a 48-bit right-shift. So gcc instead does a generic thing with four instructions in three bundles, so really not as good as our asm/swab.h. I'm not sure how to weigh the implications of converting to builtin_bswap16 (and possibly upstreaming a better implementation to gcc), vs. disabling ARCH_SUPPORTS_OPTIMIZED_INLINING (which no one else but x86 uses anyway), vs. just ignoring the compiler bug and hoping it's not an issue in practice :-) -- Chris Metcalf, Mellanox Technologies http://www.mellanox.com