[9fans] assembler question

[9fans] assembler question

[Tim Newsham]

Is it possible to generate a 3-address ADD instruction for
the 3-address machines (such as sparc using ka)?   Without
resorting to laying down the opcode manually, of course.

Tim N.

Re: [9fans] assembler question

[Russ Cox]

> Is it possible to generate a 3-address ADD instruction for
> the 3-address machines (such as sparc using ka)?   Without
> resorting to laying down the opcode manually, of course.

Looking at /sys/src/cmd/ka/a.y:208, it appears you 
can just say ADDW r2, r3, r4.  Have you tried this?

Russ

Re: [9fans] assembler question

[Tim Newsham]

> Looking at /sys/src/cmd/ka/a.y:208, it appears you
> can just say ADDW r2, r3, r4.  Have you tried this?

Ahh.. I was trying "ADD R1, $1, R2" but "ADD $1, R1, R2" seems
to have worked.  Sorry to raise a false warning.

> Russ

Tim N.

Re: [9fans] assembler question

[Charles Forsyth]

[-- Attachment #1: Type: text/plain, Size: 433 bytes --]

be careful that all the plan 9 assemblers always use source -> dest
data flow order for instructions, which can differ from the (sometimes inconsistent)
order used by others.  (i quite like this because once you know the rule,
you won't get screwed up writing code for several architectures in the same hour,
as i do, but it needs some attention if you're working from another code sample
where the conventions are different.)

[-- Attachment #2: Type: message/rfc822, Size: 2638 bytes --]

From: Tim Newsham <newsham@lava.net>
To: Russ Cox <russcox@gmail.com>, Fans of the OS Plan 9 from Bell Labs <9fans@cse.psu.edu>
Cc: 
Subject: Re: [9fans] assembler question
Date: Fri, 29 Oct 2004 17:04:11 -1000 (HST)
Message-ID: <Pine.BSI.4.58.0410291703150.24294@malasada.lava.net>

> Looking at /sys/src/cmd/ka/a.y:208, it appears you
> can just say ADDW r2, r3, r4.  Have you tried this?

Ahh.. I was trying "ADD R1, $1, R2" but "ADD $1, R1, R2" seems
to have worked.  Sorry to raise a false warning.

> Russ

Tim N.