29 Oct
2018
29 Oct
'18
11:12 a.m.
I know i960 is a very different beast, but was there ever any high level
OSs that ran on it? Or was it pidgin-holed as a high speed embedded
processor for storage controllers and NICs?
I picked up a cache of i960 CPUs a couple years ago and they speak to me
in tongues every time I pass by the shelf.
-Alan
On 2018-10-29 12:56, Ken Seefried via cctalk wrote:
the i860 found
at least a little niche on graphics boards, so somehow
not a complete failure ;-)
I'd be mildly surprised if Intel ever made enough from selling i860s
as GPUs to cover the cost of developing and marketing them. At the
time, Intel was pushing them as their RISC processor, and put a lot
into the program. Going to take over the world and all that. Maybe
not a 'complete' failure...just mostly.
From: Chuck Guzis <cclist at sydex.com>
On 10/26/18 6:10 AM, Gordon Henderson via cctalk
wrote:
It wasn't fun for the whole 2 weeks. And the i860 is Yet Another
example of Intel claiming their compilers were going to be so smart
that all the architectural complexity/warts will never be noticed.
Wrong, and they didn't learn and said the same thing about Itanium.
The interrupt stall issue that Gordon pointed out was so bad they were
basically relegated to single-task software in the end.
KJ However it was a royal PITA to code for although
a 32-bit CPU, it
would
read memory 64 bits at a time (actually 128 IIRC to satisfy the
cache),
with half that 64-bit word being an instruction for the integer unit
and
half for the floating point unit, so you effectively had to build a
floating point pipeline by hand coded instructions, so 8 (I think)
instructions to load the pipeline, then each subsequent instruction
would feed another value into the pipe, then another 8 at the end to
empty it. Great for big matrix operations, rubbish for a single add
of 2
FP numbers.
My impression of the i860 was that it might have been fun for about 2
weeks for which to code assembly, but after that, you'd really start
looking hard for an HLL to do the dirty work for you. While there's a
sense of accomplishment over looking at a page of painfully
hand-optimized code that manages to keep everything busy with no
"bubbles", you begin to wonder if there isn't a better way to spend
your
life.