Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1422696Ab2JXVzc (ORCPT ); Wed, 24 Oct 2012 17:55:32 -0400 Received: from mail-da0-f46.google.com ([209.85.210.46]:53815 "EHLO mail-da0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1161208Ab2JXVz1 (ORCPT ); Wed, 24 Oct 2012 17:55:27 -0400 From: Juri Lelli To: peterz@infradead.org, tglx@linutronix.de Cc: mingo@redhat.com, rostedt@goodmis.org, oleg@redhat.com, fweisbec@gmail.com, darren@dvhart.com, johan.eker@ericsson.com, p.faure@akatech.ch, linux-kernel@vger.kernel.org, claudio@evidence.eu.com, michael@amarulasolutions.com, fchecconi@gmail.com, tommaso.cucinotta@sssup.it, juri.lelli@gmail.com, nicola.manica@disi.unitn.it, luca.abeni@unitn.it, dhaval.giani@gmail.com, hgu1972@gmail.com, paulmck@linux.vnet.ibm.com, raistlin@linux.it, insop.song@ericsson.com, liming.wang@windriver.com, jkacur@redhat.com, harald.gustafsson@ericsson.com, vincent.guittot@linaro.org, Peter Zijlstra , Ingo Molnar , "H. Peter Anvin" , Andrew Morton , Linus Torvalds Subject: [PATCH 02/16] math128, x86_64: Implement {mul,add}_u128 in 64bit asm Date: Wed, 24 Oct 2012 14:53:40 -0700 Message-Id: <1351115634-8420-3-git-send-email-juri.lelli@gmail.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1351115634-8420-1-git-send-email-juri.lelli@gmail.com> References: <1351115634-8420-1-git-send-email-juri.lelli@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1878 Lines: 70 From: Peter Zijlstra Enable __int128 usage when available, if not, provide asm versions of mul_u64_u64 and add_u128. Cc: Ingo Molnar Cc: Thomas Gleixner Cc: H. Peter Anvin Cc: Andrew Morton Cc: Linus Torvalds Signed-off-by: Peter Zijlstra Link: http://lkml.kernel.org/n/tip-67zk6v8agsi8m7k1bdcd0srw@git.kernel.org --- arch/x86/include/asm/math128.h | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) create mode 100644 arch/x86/include/asm/math128.h diff --git a/arch/x86/include/asm/math128.h b/arch/x86/include/asm/math128.h new file mode 100644 index 0000000..c0e2a6c --- /dev/null +++ b/arch/x86/include/asm/math128.h @@ -0,0 +1,39 @@ +#ifndef _ASM_MATH128_H +#define _ASM_MATH128_H + +#ifdef CONFIG_X86_64 + +#ifdef __SIZEOF_INT128__ +#define ARCH_HAS_INT128 +#endif + +#ifndef ARCH_HAS_INT128 + +static inline u128 mul_u64_u64(u64 a, u64 b) +{ + u128 res; + + asm("mulq %2" + : "=a" (res.lo), "=d" (res.hi) + : "rm" (b), "0" (a)); + + return res; +} +#define mul_u64_u64 mul_u64_u64 + +static inline u128 add_u128(u128 a, u128 b) +{ + u128 res; + + asm("addq %2,%0;\n" + "adcq %3,%1;\n" + : "=rm" (res.lo), "=rm" (res.hi) + : "r" (b.lo), "r" (b.hi), "0" (a.lo), "1" (a.hi)); + + return res; +} +#define add_u128 add_u128 + +#endif /* ARCH_HAS_INT128 */ +#endif /* CONFIG_X86_64 */ +#endif /* _ASM_MATH128_H */ -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/