Re: OoO execution

On Thu, 29 May 2025 20:06:21 +0000, MitchAlsup1 wrote:

quadibloc <quadibloc@gmail.com> writes:
>

Eventually, IBM caught up with the Control Data 6600 by perfecting
pipelining in the IBM 360/91,

>
At the cost of about 3× the number of gates and power along with a 60%
increase in the clock rate (60ns versus 100ns). This advantage vanished
about the time of first /91 deliveries with CDC 7600 going to a ~27ns
clock along with pipelining and concurrent calculation.

Like I said, part of IBM’s tradition of overpromising and
underdelivering.

But it served its purpose, that of dissuading customers from buying
the CDC product.

Mc68010 had a "loop buffer" of a couple handful of instructions.
Mc68020 had 256B instruction cache no TLB
Mc68030 had 256B I$ 256B D$ and ~32E TLB tablewalks in HW

As I recall, the ’030 wasn’t that much of an advance over the ’020.
But the 68040 was a major step forward. And the 68060 wasn’t too bad,
either. But by that time the major customer (Apple) had lost interest.
I think it was used in some Amiga machines.