Re: Concertlina II: Full Circle

Liste des GroupesRevenir à c arch 
Sujet : Re: Concertlina II: Full Circle
De : quadibloc (at) *nospam* servername.invalid (John Savard)
Groupes : comp.arch
Date : 23. Jun 2024, 06:04:28
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <biaf7j90qmtir41uphv2l02n57jn6vmc8i@4ax.com>
References : 1 2 3 4 5 6 7 8 9 10
User-Agent : Forte Free Agent 3.3/32.846
On Wed, 19 Jun 2024 21:39:11 -0600, John Savard
<quadibloc@servername.invalid> wrote:

So I've added operate instructions that allow operations where one
operand is in a normal register, and the other operand is in a
selected element of a vector register. The element is itself specified
by the contents of an integer register, for convenient use within
loops.
>
Thus, a VVM-alike loop, instead of going from some vectors in memory
to other vectors in memory, could go from some vector registers to
other vector registers. The vectors aren't virtual any more.

Because it seemed to me that any VVM-alike instruction I had would
have to have at least an alternate form longer than 32 bits, despite
my efforts to squeeze it in to much less space than you use... I felt
that I needed to go back to an earlier iteration of Concertina for a
method of making it easier to use long instructions in programs.

Doing that, though, required me to reserve some opcode space, and one
of the consequence is that the instructions referred to above had to
be moved to an alternate instruction set!

I haven['t yet added the additional long instructions to the pages. If
I'm reserving that much opcode space (1/32nd of the total opcode
space) I'm thinking I should do something amazing with it, not
something ho-hum.

Meanwhile, though, I have added something "amazing" to the ISA for a
very tiny cost in opcode space. I've added an eleventh header type
which applies *four* prefix bits to every 16 bits in what's left of
the block after the header.

What does this do?

Well, it used to be I had 16-bit instructions occupying 1/4 of the
opcode space which included register-to-register instructions that
could involve only two registers from the same group of eight
registers.

Partly because I was told this was a very bad thing, and because I
needed to take that 1/4 of the opcode space back so I could have
load-store instructions that were not heavily restricted to squeeze
them into less space, I used prefix bits to change the 15-bit
instructions to 17-bit instructions that could use any two registers.

Well, the new header type adds the option to also, by using some
prefix bits, assign a 19-bit instruction to a 16-bit slot... and these
19-bit instructions add memory-reference instructions to the half-word
instructions.

So now, in addition to containing up to 8 ordinary 32-bit
instructions, a 256-bit block can contain up to 24 instructions
belonging to a mix of 17-bit and 19-bit instructions, short
instructions that now are a complete set, including load and store
memory reference instructions.

John Savard

Date Sujet#  Auteur
17 Jun 24 * Concertlina II: Full Circle39John Savard
17 Jun 24 `* Re: Concertlina II: Full Circle38MitchAlsup1
17 Jun 24  `* Re: Concertlina II: Full Circle37John Savard
18 Jun 24   `* Re: Concertlina II: Full Circle36MitchAlsup1
18 Jun 24    +* Re: Concertlina II: Full Circle34John Savard
18 Jun 24    i+* Re: Concertlina II: Full Circle31John Savard
18 Jun 24    ii+* Re: Concertlina II: Full Circle9Thomas Koenig
18 Jun 24    iii`* Re: Concertlina II: Full Circle8John Savard
18 Jun 24    iii `* Re: Concertlina II: Full Circle7Thomas Koenig
18 Jun 24    iii  +* Re: Concertlina II: Full Circle2John Savard
19 Jun 24    iii  i`- Re: Concertlina II: Full Circle1John Savard
19 Jun 24    iii  `* Re: Concertlina II: Full Circle4Stephen Fuld
19 Jun 24    iii   +- Re: Concertlina II: Full Circle1MitchAlsup1
19 Jun 24    iii   +- Re: Concertlina II: Full Circle1MitchAlsup1
19 Jun 24    iii   `- Re: Concertlina II: Full Circle1MitchAlsup1
18 Jun 24    ii`* Re: Concertlina II: Full Circle21MitchAlsup1
18 Jun 24    ii `* Re: Concertlina II: Full Circle20John Savard
18 Jun 24    ii  +* Re: Concertlina II: Full Circle18MitchAlsup1
19 Jun 24    ii  i+* Re: Concertlina II: Full Circle16John Savard
19 Jun 24    ii  ii`* Re: Concertlina II: Full Circle15MitchAlsup1
19 Jun 24    ii  ii +* Re: Concertlina II: Full Circle8John Savard
20 Jun 24    ii  ii i`* Re: Concertlina II: Full Circle7John Savard
23 Jun 24    ii  ii i +* Re: Concertlina II: Full Circle2John Savard
25 Jun 24    ii  ii i i`- Re: Concertlina II: Full Circle1John Savard
23 Jun 24    ii  ii i `* Re: Concertlina II: Full Circle4MitchAlsup1
23 Jun 24    ii  ii i  `* Re: Concertlina II: Full Circle3John Savard
24 Jun 24    ii  ii i   `* Re: Concertlina II: Full Circle2MitchAlsup1
24 Jun 24    ii  ii i    `- Re: Concertlina II: Full Circle1John Savard
19 Jun 24    ii  ii `* Re: Concertlina II: Full Circle6Terje Mathisen
19 Jun 24    ii  ii  +* Re: Concertlina II: Full Circle2MitchAlsup1
19 Jun 24    ii  ii  i`- Re: Concertlina II: Full Circle1Terje Mathisen
19 Jun 24    ii  ii  `* Re: Concertlina II: Full Circle3Thomas Koenig
19 Jun 24    ii  ii   `* Re: Concertlina II: Full Circle2MitchAlsup1
19 Jun 24    ii  ii    `- Re: Concertlina II: Full Circle1Terje Mathisen
20 Jun 24    ii  i`- Re: Concertlina II: Full Circle1John Savard
19 Jun 24    ii  `- Re: Concertlina II: Full Circle1MitchAlsup1
18 Jun 24    i`* Re: Concertlina II: Full Circle2MitchAlsup1
18 Jun 24    i `- Re: Concertlina II: Full Circle1BGB-Alt
19 Jun 24    `- return for loop-back edges (Re: Concertlina II: Full Circle)1Anton Ertl

Haut de la page

Les messages affichés proviennent d'usenet.

NewsPortal