[PATCH v2 6/7] powerpc/dt_cpu_ftrs: Add MMA feature

Paul A. Clarke pc at us.ibm.com
Wed May 20 01:49:22 AEST 2020


On Tue, May 19, 2020 at 10:28:55AM -0500, Segher Boessenkool wrote:
> On Tue, May 19, 2020 at 10:22:40AM -0500, Paul A. Clarke wrote:
> > On Tue, May 19, 2020 at 10:05:56AM -0500, Segher Boessenkool wrote:
> > > On Tue, May 19, 2020 at 09:49:22AM -0500, Paul A. Clarke wrote:
> > > > On Tue, May 19, 2020 at 10:31:56AM +1000, Alistair Popple wrote:
> > > > > Matrix multiple accumulate (MMA) is a new feature added to ISAv3.1 and
> > > > 
> > > > nit: "Matrix-Multiply Accelerator".
> > > 
> > > "Matrix-Multiply Assist" in fact :-)
> > 
> > Not according to the ISA (p. 1129).
> 
> There is one mistake in the 3.1 ABI yes, in the description for the PCR
> bit of this same name.  Everything else calls this "assist", like all
> similar things are called as well (whereas an "accelerator" is an
> external device).

I stand corrected. The PCR bit description is in error, and that's what I
was going by.  Section 7.6.1.12 "VSX Matrix-Multiply Assist (MMA)
Instructions" seems to be more definitive.  Thanks, Segher, for correcting
my correction.

Should be "Matrix-Multiply Assist".

:-)

PC


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