Re: My 66000 and High word facility

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Sujet : Re: My 66000 and High word facility
De : tkoenig (at) *nospam* netcologne.de (Thomas Koenig)
Groupes : comp.arch
Date : 17. Aug 2024, 23:05:03
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <v9r6qf$22f31$1@dont-email.me>
References : 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
User-Agent : slrn/1.0.3 (Linux)
Brett <ggtgp@yahoo.com> schrieb:
Thomas Koenig <tkoenig@netcologne.de> wrote:
Brett <ggtgp@yahoo.com> schrieb:

Software guys generally work with high-level languages where this is
irrelevant, except for...
 
Of course convincing programmers to RTFM is futile. ;(
 
...people writing operating systems or drivers, and they better
read the docs for the architecture they are working on.
 
So we are back to finding any downsides for 64 registers in My 66000.
 
Encoding space.  Not sure if you have Mitch's document,
>
Section 4.1 Instruction Template, Figure 25, page 33-179
>
but having
one more bit per register would reduce the 16-bit data in the
offset to 14 (no way you can expand that by a factor of four),
>
14 is plenty,

16 is better.

you can actually do 12 and pack those instructions in with
shifts which have a pair of 6 bit fields, width and offset. This would
expand some constants but you make it back in shorter code with less MOVs
and more performance.

Hmm... I am not convinced.

Do you have code to back up your claims?

would require eight instead of one major opcodes for the three-
register instructions,
>
Mitch gloats about how many major opcodes he has free, in his 7 bit opcode

It's 6 for the major opcode, actually.

he has the greater part of a bit free, so we are a good part of the way
there.

That sentence no parse.

Conceptually some of the modifier bits move into the opcode space, not as
clean but you have to squeeze those bits hard

It is very fine point of semantics if the modifier bits are part
of the opcode space or not.  I happen to think that they are,
they are just in a (somehwat) different place and spelled a bit
differently, but it does not really matter how you look at it -
you need the bits to encode them.

One can come up with a few
patterns that are not hard to decode, and spread across several instruction
types.

So, go right ahead.  Find an encoding that a) encompasses all of
Mitch's functionality, b) has six bits for registers everywhere,
and c) does not drive the assembler writer crazy (that's me,
for Mitch's design) or hardware designer bonkers (where Mitch has
the experience).

Let's start with the... BB1 instruction, which branches on bit
set in a register, so it needs a major opcode, a bit number, a
register number and a displacement.  How do you propose to do that?
Shave one bit off the displacement?

>
and the four-register instructions like FMA...
>
Trying to wave a red flag in front of Mitch. ;)

I just happen to like FMA :-)

Of course, it might be possible to code FMA like AVX does, with
only three registers - 18 bits for three registers, plus two bits
for which one of them gets smashed for the result.

But - just making offhand suggestions won't cut it.  You will
have to think about the layout of the instructions, how everything
fits in, and needing one to four more bits per instruction
can be accomodated.

Date Sujet#  Auteur
10 Aug 24 * My 66000 and High word facility94Brett
10 Aug 24 +* Re: My 66000 and High word facility92MitchAlsup1
11 Aug 24 i`* Re: My 66000 and High word facility91Brett
11 Aug 24 i +- Re: My 66000 and High word facility1Thomas Koenig
11 Aug 24 i +* Re: My 66000 and High word facility61Anton Ertl
11 Aug 24 i i+* Re: My 66000 and High word facility20Brett
12 Aug 24 i ii`* Re: My 66000 and High word facility19Anton Ertl
12 Aug 24 i ii +* Re: My 66000 and High word facility17MitchAlsup1
12 Aug 24 i ii i`* Re: My 66000 and High word facility16BGB
12 Aug 24 i ii i `* Re: My 66000 and High word facility15MitchAlsup1
12 Aug 24 i ii i  `* Re: My 66000 and High word facility14BGB
13 Aug 24 i ii i   `* Re: My 66000 and High word facility13MitchAlsup1
13 Aug 24 i ii i    `* Re: My 66000 and High word facility12BGB
13 Aug 24 i ii i     `* Re: My 66000 and High word facility11MitchAlsup1
13 Aug 24 i ii i      `* Re: My 66000 and High word facility10BGB
13 Aug 24 i ii i       `* Re: My 66000 and High word facility9MitchAlsup1
13 Aug 24 i ii i        +* Re: My 66000 and High word facility5Thomas Koenig
13 Aug 24 i ii i        i+* Re: My 66000 and High word facility3MitchAlsup1
14 Aug 24 i ii i        ii`* Re: My 66000 and High word facility2Thomas Koenig
14 Aug 24 i ii i        ii `- Re: My 66000 and High word facility1MitchAlsup1
14 Aug 24 i ii i        i`- Re: My 66000 and High word facility1BGB
14 Aug 24 i ii i        `* Re: My 66000 and High word facility3BGB
15 Aug 24 i ii i         `* Re: My 66000 and High word facility2MitchAlsup1
15 Aug 24 i ii i          `- Re: My 66000 and High word facility1BGB
15 Aug 24 i ii `- Re: My 66000 and High word facility1MitchAlsup1
11 Aug 24 i i+- Re: My 66000 and High word facility1Niklas Holsti
11 Aug 24 i i+* Re: My 66000 and High word facility31BGB
12 Aug 24 i ii`* Re: My 66000 and High word facility30Brett
12 Aug 24 i ii +* Re: My 66000 and High word facility2Terje Mathisen
16 Oct 24 i ii i`- Re: My 66000 and High word facility1Paul A. Clayton
15 Aug 24 i ii +* Re: My 66000 and High word facility25MitchAlsup1
15 Aug 24 i ii i`* Re: My 66000 and High word facility24Brett
15 Aug 24 i ii i `* Re: My 66000 and High word facility23Brett
15 Aug 24 i ii i  `* Re: My 66000 and High word facility22Stephen Fuld
16 Aug 24 i ii i   `* Re: My 66000 and High word facility21Brett
16 Aug 24 i ii i    +- Re: My 66000 and High word facility1Brett
16 Aug 24 i ii i    `* Re: My 66000 and High word facility19MitchAlsup1
17 Aug 24 i ii i     `* Re: My 66000 and High word facility18Brett
17 Aug 24 i ii i      +* Re: My 66000 and High word facility8Thomas Koenig
17 Aug 24 i ii i      i`* Re: My 66000 and High word facility7Brett
18 Aug 24 i ii i      i +* Re: My 66000 and High word facility5Thomas Koenig
18 Aug 24 i ii i      i i`* Re: My 66000 and High word facility4MitchAlsup1
18 Aug 24 i ii i      i i +- Re: My 66000 and High word facility1Brett
18 Aug 24 i ii i      i i `* Re: My 66000 and High word facility2Thomas Koenig
19 Aug 24 i ii i      i i  `- Re: My 66000 and High word facility1BGB
19 Aug 24 i ii i      i `- Re: My 66000 and High word facility1BGB
17 Aug 24 i ii i      `* Re: My 66000 and High word facility9MitchAlsup1
17 Aug 24 i ii i       `* Re: My 66000 and High word facility8Brett
18 Aug 24 i ii i        +* Re: My 66000 and High word facility2MitchAlsup1
18 Aug 24 i ii i        i`- Re: My 66000 and High word facility1Brett
19 Aug 24 i ii i        `* Re: My 66000 and High word facility5Stefan Monnier
19 Aug 24 i ii i         +- Re: My 66000 and High word facility1BGB
19 Aug 24 i ii i         `* Re: My 66000 and High word facility3MitchAlsup1
19 Aug 24 i ii i          +- Re: My 66000 and High word facility1Thomas Koenig
20 Aug 24 i ii i          `- Re: My 66000 and High word facility1Michael S
20 Aug 24 i ii `* Re: My 66000 and High word facility2Stefan Monnier
21 Aug 24 i ii  `- Re: My 66000 and High word facility1BGB
15 Aug 24 i i`* Re: My 66000 and High word facility8MitchAlsup1
15 Aug 24 i i +* Re: My 66000 and High word facility3Anton Ertl
15 Aug 24 i i i`* Re: My 66000 and High word facility2Michael S
15 Aug 24 i i i `- Re: My 66000 and High word facility1MitchAlsup1
15 Aug 24 i i `* Re: My 66000 and High word facility4Michael S
15 Aug 24 i i  `* Re: My 66000 and High word facility3Stephen Fuld
15 Aug 24 i i   `* Re: My 66000 and High word facility2Michael S
15 Aug 24 i i    `- Re: My 66000 and High word facility1MitchAlsup1
19 Aug 24 i `* Re: My 66000 and High word facility28MitchAlsup1
19 Aug 24 i  `* Re: My 66000 and High word facility27Brett
19 Aug 24 i   `* Re: My 66000 and High word facility26MitchAlsup1
20 Aug 24 i    +* Re: My 66000 and High word facility3Brett
20 Aug 24 i    i`* Re: My 66000 and High word facility2MitchAlsup1
20 Aug 24 i    i `- Re: My 66000 and High word facility1Brett
20 Aug 24 i    `* number of registers (was: My 66000 and High word facility)22Anton Ertl
20 Aug 24 i     `* Re: number of registers21MitchAlsup1
20 Aug 24 i      +* Re: number of registers13Michael S
20 Aug 24 i      i`* Re: number of registers12MitchAlsup1
21 Aug 24 i      i +* Re: number of registers6Brett
21 Aug 24 i      i i+* Re: number of registers4MitchAlsup1
21 Aug 24 i      i ii+* Re: number of registers2Brett
23 Aug 24 i      i iii`- Re: number of registers1Brett
22 Aug 24 i      i ii`- Re: number of registers1Stephen Fuld
21 Aug 24 i      i i`- Re: number of registers1Anton Ertl
21 Aug 24 i      i `* Re: number of registers5Anton Ertl
21 Aug 24 i      i  +* Re: number of registers3Stephen Fuld
21 Aug 24 i      i  i`* Re: number of registers2Anton Ertl
21 Aug 24 i      i  i `- Re: number of registers1Stephen Fuld
21 Aug 24 i      i  `- Re: number of registers1Anton Ertl
20 Aug 24 i      `* Re: number of registers7MitchAlsup1
21 Aug 24 i       `* Re: number of registers6Anton Ertl
21 Aug 24 i        +* Re: number of registers3Michael S
21 Aug 24 i        i`* Re: number of registers2Anton Ertl
21 Aug 24 i        i `- Re: number of registers1Michael S
21 Aug 24 i        `* Re: number of registers2MitchAlsup1
21 Aug 24 i         `- Re: number of registers1Michael S
10 Aug 24 `- Re: My 66000 and High word facility1MitchAlsup1

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