Re: EXTERNAL: Re: [vhdl-200x] Modular types

From: Evan Lavelle <>
Date: Tue Jul 01 2014 - 04:49:51 PDT
On 01/07/2014 12:00, Martin.J Thompson wrote:

> Many VHDL users have wanted >32 bits for their ints, and the proposal
> is that instead of just saying 64-bits will be enough, to not limit
> things (much as Python doesn't limit you either).

I'm all in favour of bignums, and I've done a compiler bignum 
implementation myself (not VHDL, and no exponentiation; 4-state bignums 
for "logic", 2-state for "integers"). Existing simulators should 
essentially already contain something very similar, and the work 
involved in exposing a 2-state interface should be small. When you're 
writing a compiler from scratch, it's trivial and obvious to use the 
same infrastructure for vectors and big integers.

My concern was more with modular types, which seem to me to have little 
benefit for what looks like significant complexity.

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Received on Tue Jul 1 04:50:13 2014

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