On Wed, Jun 06, 2018 at 02:42:27PM +0800, Simon Guo wrote:
> I now felt unformatable to use mcrf like:
> mcrf7,0
>
> since I cannot 100% confident that compiler will not use CR7 or other
> CR# in exit_vmx_ops().
It wasn't clear to me this macro boils down to a function call.
You can use CR2,
Hi segher,
On Wed, May 30, 2018 at 05:03:21PM +0800, Simon Guo wrote:
> On Wed, May 30, 2018 at 03:35:40AM -0500, Segher Boessenkool wrote:
> > On Wed, May 30, 2018 at 04:14:02PM +0800, Simon Guo wrote:
> > > Hi Segher,
> > > On Mon, May 28, 2018 at 06:05:59AM -0500, Segher Boessenkool wrote:
> > >
On Wed, May 30, 2018 at 03:35:40AM -0500, Segher Boessenkool wrote:
> On Wed, May 30, 2018 at 04:14:02PM +0800, Simon Guo wrote:
> > Hi Segher,
> > On Mon, May 28, 2018 at 06:05:59AM -0500, Segher Boessenkool wrote:
> > > On Fri, May 25, 2018 at 12:07:34PM +0800, wei.guo.si...@gmail.com wrote:
> >
On Wed, May 30, 2018 at 04:14:02PM +0800, Simon Guo wrote:
> Hi Segher,
> On Mon, May 28, 2018 at 06:05:59AM -0500, Segher Boessenkool wrote:
> > On Fri, May 25, 2018 at 12:07:34PM +0800, wei.guo.si...@gmail.com wrote:
> > > + /* save and restore cr0 */
> > > + mfocrf r5,64
> > > + EXIT_VMX_OPS
>
Hi Michael,
On Mon, May 28, 2018 at 09:59:29PM +1000, Michael Ellerman wrote:
> Hi Simon,
>
> wei.guo.si...@gmail.com writes:
> > diff --git a/arch/powerpc/lib/memcmp_64.S b/arch/powerpc/lib/memcmp_64.S
> > index f20e883..4ba7bb6 100644
> > --- a/arch/powerpc/lib/memcmp_64.S
> > +++ b/arch/powerpc
Hi Segher,
On Mon, May 28, 2018 at 06:05:59AM -0500, Segher Boessenkool wrote:
> On Fri, May 25, 2018 at 12:07:34PM +0800, wei.guo.si...@gmail.com wrote:
> > + /* save and restore cr0 */
> > + mfocrf r5,64
> > + EXIT_VMX_OPS
> > + mtocrf 64,r5
> > + b .LcmpAB_lightweight
>
> That
Hi Simon,
wei.guo.si...@gmail.com writes:
> diff --git a/arch/powerpc/lib/memcmp_64.S b/arch/powerpc/lib/memcmp_64.S
> index f20e883..4ba7bb6 100644
> --- a/arch/powerpc/lib/memcmp_64.S
> +++ b/arch/powerpc/lib/memcmp_64.S
> @@ -174,6 +235,13 @@ _GLOBAL(memcmp)
> blr
>
> .Llong:
> +#ifdef
On Fri, May 25, 2018 at 12:07:34PM +0800, wei.guo.si...@gmail.com wrote:
> + /* save and restore cr0 */
> + mfocrf r5,64
> + EXIT_VMX_OPS
> + mtocrf 64,r5
> + b .LcmpAB_lightweight
That's cr1, not cr0. You can use mcrf instead, it is cheaper (esp. if
you have it in a n
From: Simon Guo
This patch add VMX primitives to do memcmp() in case the compare size
is equal or greater than 4K bytes. KSM feature can benefit from this.
Test result with following test program(replace the "^>" with ""):
--
># cat tools/testing/selftests/powerpc/stringloops/memcmp.c
>#incl
