Re: [RFC] arm64: Ensure proper addressing for ldnp/stnp

[bdegraaf]

On 2016-09-19 14:28, Laura Abbott wrote:
> On 09/19/2016 10:36 AM, Brent DeGraaf wrote:
> > According to section 6.3.8 of the ARM Programmer's Guide, non-temporal
> > loads and stores do not verify that address dependency is met between 
> > a
> > load of an address to a register and a subsequent non-temporal load or
> > store using that address on the executing PE. Therefore, context 
> > switch
> > code and subroutine calls that use non-temporally accessed addresses 
> > as
> > parameters that might depend on a load of an address into an argument
> > register must ensure that ordering requirements are met by introducing
> > a barrier prior to the successive non-temporal access.  Add 
> > appropriate
> > barriers whereever this specific situation comes into play.
>
> Was this found by code inspection or is there a (public) exciting test
> case to observe this behavior?
>
> Thanks,
> Laura

Code inspection only.

Brent