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Path: ...!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From: Lawrence D'Oliveiro <ldo@nz.invalid>
Newsgroups: comp.arch
Subject: Re: Decrement And Branch
Date: Wed, 14 Aug 2024 08:53:22 -0000 (UTC)
Organization: A noiseless patient Spider
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On Wed, 14 Aug 2024 01:33:32 +0000, MitchAlsup1 wrote:

> On Tue, 13 Aug 2024 22:00:12 +0000, Lawrence D'Oliveiro wrote:
> 
>> On Tue, 13 Aug 2024 09:00:25 -0000 (UTC), I wrote:
>>
>>> However, the good old VAX (in its usual kitchen-sink fashion) had a
>>> whole set of variations, including one that decremented down to -1
>>> instead of zero. And the Motorola 68000 family only had the decrement
>>> down to -1 version.
>>
>> VAX example of how to use SOBGEQ instead of SOBGTR:
>>
>>         movl    «loop count», Rn br      bottom_of_loop
>> top_of_loop:
>>         .... body of loop ...
>> bottom_of_loop:
>>         sobgeq  Rn, top_of_loop
>>
>> Like I said, I wondered why this sort of thing wasn’t more common ...
> 
> Perhaps the RISC mantra has permeated the minds of ISA designers.

Would you prefer it with a decrement+separate conditional-jump instruction 
pair?