>>> On 22.07.15 at 13:22, wrote:
> On 22/07/15 11:04, Jan Beulich wrote:
> On 22.07.15 at 10:42, wrote:
>>> In the case of having aligned source and destination on a 16-byte
>>> boundary (which we can trivially arrange), then ERMSB (to give it its
>>> Intel name) and rep stosl differ only in
On 22/07/15 11:04, Jan Beulich wrote:
On 22.07.15 at 10:42, wrote:
>> In the case of having aligned source and destination on a 16-byte
>> boundary (which we can trivially arrange), then ERMSB (to give it its
>> Intel name) and rep stosl differ only in the setup cost; they still
>> scale at t
>>> On 22.07.15 at 10:42, wrote:
> In the case of having aligned source and destination on a 16-byte
> boundary (which we can trivially arrange), then ERMSB (to give it its
> Intel name) and rep stosl differ only in the setup cost; they still
> scale at the same rate for changes in length.
>
> Th
On 22/07/2015 06:18, Jan Beulich wrote:
Daniel Kiper 07/21/15 8:23 PM >>>
>> On Tue, Jul 21, 2015 at 03:37:48AM -0600, Jan Beulich wrote:
>> On 20.07.15 at 16:28, wrote:
>>> ... because of ??? Nowadays - with X86_FEATURE_ERMS - rep stosb
>>> is expected to be faster than rep stosl.
>> OK
>>> Daniel Kiper 07/21/15 8:23 PM >>>
>On Tue, Jul 21, 2015 at 03:37:48AM -0600, Jan Beulich wrote:
>> >>> On 20.07.15 at 16:28, wrote:
>>
>> ... because of ??? Nowadays - with X86_FEATURE_ERMS - rep stosb
>> is expected to be faster than rep stosl.
>
>OK, I did not know about that. However, as I
On Tue, Jul 21, 2015 at 03:37:48AM -0600, Jan Beulich wrote:
> >>> On 20.07.15 at 16:28, wrote:
>
> ... because of ??? Nowadays - with X86_FEATURE_ERMS - rep stosb
> is expected to be faster than rep stosl.
OK, I did not know about that. However, as I know this feature
was introduced in 2012 with
>>> On 20.07.15 at 16:28, wrote:
... because of ??? Nowadays - with X86_FEATURE_ERMS - rep stosb
is expected to be faster than rep stosl.
Jan
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Additionally, align relevant comment to coding style.
Suggested-by: Andrew Cooper
Signed-off-by: Daniel Kiper
---
xen/arch/x86/boot/head.S |5 +++--
xen/arch/x86/xen.lds.S |2 ++
2 files changed, 5 insertions(+), 2 deletions(-)
diff --git a/xen/arch/x86/boot/head.S b/xen/arch/x86/boo
