[Oberon] FPGA - Bit reversal

[Skulski, Wojciech]

Alex:

I stand corrected. Thank you!

Your "wst := {0..31} - wst;" still depends on BITS. My conclusion stands: BITS should be a part of the language.

W.
________________________________________
From: Oberon [oberon-bounces at lists.inf.ethz.ch] on behalf of Alexander Ilin [ajsoft at yandex.ru]
Sent: Friday, September 22, 2017 6:09 PM
To: ETH Oberon and related systems
Subject: Re: [Oberon] FPGA - Bit reversal

Hi, Wojciech!

23.09.2017, 01:04, "Skulski, Wojciech" <skulski at pas.rochester.edu>:
> PROCEDURE ReverseWord(wd: INTEGER): INTEGER;
>  VAR wst: SET; wint: INTEGER;
> BEGIN
>   wst := BITS (wd);
>   wst := - wst;
>   wint := ORD (wst)
>  RETURN wint
> END ReverseWord;
>
> This would be a possibility if BITS were part of the Oberon language. BITS is available in Component Pascal.

  We weren't trying to invert the bits (at least that's how I read your code), we were reordering them.

  Inverting the bits is rather easy in Oberon:
  wst := {0..31} - wst;

---=====---
 Александр
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