On 22.07.15 at 10:42, andrew.coop...@citrix.com 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
On 22/07/15 11:04, Jan Beulich wrote:
On 22.07.15 at 10:42, andrew.coop...@citrix.com 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
On 22/07/2015 06:18, Jan Beulich wrote:
Daniel Kiper daniel.ki...@oracle.com 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, daniel.ki...@oracle.com wrote:
... because of ??? Nowadays - with X86_FEATURE_ERMS - rep stosb
is expected to be
On 22.07.15 at 13:22, andrew.coop...@citrix.com wrote:
On 22/07/15 11:04, Jan Beulich wrote:
On 22.07.15 at 10:42, andrew.coop...@citrix.com 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
Daniel Kiper daniel.ki...@oracle.com 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, daniel.ki...@oracle.com wrote:
... because of ??? Nowadays - with X86_FEATURE_ERMS - rep stosb
is expected to be faster than rep stosl.
OK, I did not
On Tue, Jul 21, 2015 at 03:37:48AM -0600, Jan Beulich wrote:
On 20.07.15 at 16:28, daniel.ki...@oracle.com 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
On 20.07.15 at 16:28, daniel.ki...@oracle.com 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 andrew.coop...@citrix.com
Signed-off-by: Daniel Kiper daniel.ki...@oracle.com
---
xen/arch/x86/boot/head.S |5 +++--
xen/arch/x86/xen.lds.S |2 ++
2 files changed, 5 insertions(+), 2 deletions(-)
diff
