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From: Andrew Cooper <andrew.cooper3@citrix.com>
To: Jan Beulich <JBeulich@suse.com>,
	xen-devel <xen-devel@lists.xenproject.org>
Cc: Keir Fraser <keir@xen.org>
Subject: Re: [PATCH 1/3] x86: also allow REP STOS emulation acceleration
Date: Thu, 8 Jan 2015 19:29:04 +0000	[thread overview]
Message-ID: <54AEDA80.4080405@citrix.com> (raw)
In-Reply-To: <54AEB5690200007800052BF1@mail.emea.novell.com>

On 08/01/15 15:50, Jan Beulich wrote:
> +        if ( !buf )
> +            buf = p_data;
> +        else
> +            switch ( bytes_per_rep )
> +            {
> +#define CASE(bits, suffix)                                      \
> +            case (bits) / 8:                                    \
> +                asm ( "rep stos" #suffix                        \
> +                      :: "a" (*(const uint##bits##_t *)p_data), \
> +                         "D" (buf), "c" (*reps)                 \
> +                      : "memory" );                             \

This looks as if it needs output clobbers for D and c

~Andrew

  parent reply	other threads:[~2015-01-08 19:38 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-01-08 15:47 [PATCH 0/3] x86: XSA-112 follow-ups Jan Beulich
2015-01-08 15:50 ` [PATCH 1/3] x86: also allow REP STOS emulation acceleration Jan Beulich
2015-01-08 16:16   ` Tim Deegan
2015-01-08 16:29     ` Jan Beulich
2015-01-08 16:56       ` Tim Deegan
2015-01-08 17:05         ` Jan Beulich
2015-01-08 18:15           ` Tim Deegan
2015-01-08 19:29   ` Andrew Cooper [this message]
2015-01-09  8:42     ` Jan Beulich
2015-01-09 10:27     ` [PATCH v2 " Jan Beulich
2015-01-09 10:56       ` Andrew Cooper
2015-01-09 11:10         ` Jan Beulich
2015-01-09 11:18         ` Tim Deegan
2015-01-09 11:24           ` Jan Beulich
2015-01-09 11:45             ` Tim Deegan
2015-01-09 12:10               ` Jan Beulich
2015-01-09 12:46                 ` Andrew Cooper
2015-01-09 15:20                   ` Tim Deegan
2015-01-12 14:54                 ` George Dunlap
2015-01-12 15:27                   ` Jan Beulich
2015-01-08 15:51 ` [PATCH 2/3] x86/HVM: drop pointless parameters from vIOAPIC internal routines Jan Beulich
2015-01-08 16:13   ` Tim Deegan
2015-01-08 15:52 ` [PATCH 3/3] x86/HVM: vMSI simplification Jan Beulich
2015-01-08 16:14   ` Tim Deegan
2015-01-08 16:30     ` Jan Beulich
2015-01-08 16:33       ` Tim Deegan
2015-01-09 10:23   ` Andrew Cooper

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