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

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:

quoted

On Tue, May 19, 2020 at 10:05:56AM -0500, Segher Boessenkool wrote:

quoted

On Tue, May 19, 2020 at 09:49:22AM -0500, Paul A. Clarke wrote:

quoted

On Tue, May 19, 2020 at 10:31:56AM +1000, Alistair Popple wrote:

quoted

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