From: "H. Peter Anvin" <hpa@zytor.com>
To: Juri Lelli <juri.lelli@gmail.com>
Cc: peterz@infradead.org, tglx@linutronix.de, 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, 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 <a.p.zijlstra@chello.nl>,
Ingo Molnar <mingo@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: [PATCH 02/16] math128, x86_64: Implement {mul,add}_u128 in 64bit asm
Date: Wed, 24 Oct 2012 15:27:15 -0700 [thread overview]
Message-ID: <50886B43.3080001@zytor.com> (raw)
In-Reply-To: <1351115634-8420-3-git-send-email-juri.lelli@gmail.com>
On 10/24/2012 02:53 PM, Juri Lelli wrote:
> 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
> +
How could this work since u128 presumably has not yet been defined as a
structure? After all, isn't it the absence of ARCH_HAS_INT128 which
makes that happen?
-hpa
next prev parent reply other threads:[~2012-10-24 22:29 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-24 21:53 [RFC][PATCH 00/16] sched: SCHED_DEADLINE v6 Juri Lelli
2012-10-24 21:53 ` [PATCH 01/16] math128: Introduce various 128bit primitives Juri Lelli
2012-10-24 22:48 ` Juri Lelli
2012-10-24 23:18 ` Linus Torvalds
2012-10-25 0:08 ` Steven Rostedt
2012-10-25 0:09 ` Linus Torvalds
2012-10-25 13:47 ` Peter Zijlstra
2012-10-25 14:13 ` Peter Zijlstra
2012-10-25 22:26 ` Linus Torvalds
2012-10-26 8:49 ` Peter Zijlstra
2012-10-26 9:24 ` Ingo Molnar
2012-10-26 9:35 ` Peter Zijlstra
2012-10-26 9:42 ` Ingo Molnar
2012-10-26 9:54 ` Peter Zijlstra
2012-10-26 10:04 ` Ingo Molnar
2012-10-26 10:36 ` Thomas Gleixner
2012-10-26 10:44 ` Peter Zijlstra
2012-10-26 11:11 ` Ingo Molnar
2012-10-26 12:56 ` Peter Zijlstra
2012-10-26 18:12 ` Juri Lelli
2012-10-26 18:28 ` Steven Rostedt
2012-10-26 18:34 ` Thomas Gleixner
2012-10-26 18:41 ` Juri Lelli
2012-10-26 12:39 ` Steven Rostedt
2012-10-26 13:09 ` Steven Rostedt
2012-10-26 9:52 ` Harald Gustafsson
2012-10-26 15:17 ` Linus Torvalds
2012-10-25 5:21 ` Geert Uytterhoeven
2012-10-25 13:38 ` Peter Zijlstra
2012-10-24 21:53 ` [PATCH 02/16] math128, x86_64: Implement {mul,add}_u128 in 64bit asm Juri Lelli
2012-10-24 22:27 ` H. Peter Anvin [this message]
2012-10-24 22:47 ` Juri Lelli
2012-10-24 22:51 ` H. Peter Anvin
2012-10-24 21:53 ` [PATCH 03/16] sched: add sched_class->task_dead Juri Lelli
2012-10-24 21:53 ` [PATCH 04/16] sched: add extended scheduling interface Juri Lelli
2012-10-24 21:53 ` [PATCH 05/16] sched: SCHED_DEADLINE structures & implementation Juri Lelli
2012-10-24 21:53 ` [PATCH 06/16] sched: SCHED_DEADLINE SMP-related data structures & logic Juri Lelli
2012-10-24 21:53 ` [PATCH 07/16] sched: SCHED_DEADLINE avg_update accounting Juri Lelli
2012-10-24 21:53 ` [PATCH 08/16] sched: add period support for -deadline tasks Juri Lelli
2012-10-24 21:53 ` [PATCH 09/16] sched: add schedstats " Juri Lelli
2012-10-24 21:53 ` [PATCH 10/16] sched: add latency tracing " Juri Lelli
2012-10-24 21:53 ` [PATCH 11/16] rtmutex: turn the plist into an rb-tree Juri Lelli
2012-10-24 21:53 ` [PATCH 12/16] sched: drafted deadline inheritance logic Juri Lelli
2012-10-24 21:53 ` [PATCH 13/16] sched: add bandwidth management for sched_dl Juri Lelli
2012-10-24 21:53 ` [PATCH 14/16] sched: make dl_bw a sub-quota of rt_bw Juri Lelli
2012-10-24 21:53 ` [PATCH 15/16] sched: speed up -dl pushes with a push-heap Juri Lelli
2012-10-24 21:53 ` [PATCH 16/16] sched: add sched_dl documentation Juri Lelli
2012-10-25 7:18 ` [RFC][PATCH 00/16] sched: SCHED_DEADLINE v6 Ingo Molnar
2012-10-25 9:53 ` Borislav Petkov
2012-10-25 16:58 ` Juri Lelli
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