Re: [sv-bc] RE: [sv-ec] Are variable-width part selects already part of the SV language? (Mantis 2684)

Shalom,

The purpose of

     out[127:0] = { in[127:N], replace[N-1:0] } ;

is to construct the new vector. Variable-width part-select was just
one proposed means to that end.

You couldn't implement a variable-width part-select operator with a
parameterized function, but you could implement the foreach of
http://www.eda.org/sv-bc/hm/10223.html

      foreach (out[i])
        out[i] = (i >= N) ? in[i] : replace[i] ;

because out, in, and replace all have a width that is known at elaboration time.

-- Brad

On Mon, May 10, 2010 at 8:10 AM, Bresticker, Shalom
<shalom.bresticker@intel.com> wrote:
> I don't see how a parameterized function would help. Function parameter overrides also have to be constants.
>
> Shalom
>
>
>> -----Original Message-----
>> From: owner-sv-ec@eda.org [mailto:owner-sv-ec@eda.org] On
>> Behalf Of Brad Pierce
>> Sent: Monday, May 10, 2010 6:08 PM
>> To: Steven Sharp
>> Cc: sv-bc@eda.org; sv-ec@eda.org
>> Subject: Re: [sv-bc] RE: [sv-ec] Are variable-width part
>> selects already part of the SV language? (Mantis 2684)
>>
>> > It can't be used within an expression, without wrapping it
>> in a function first.
>>
>> Shalom said that he only needed it in an assignment-like context.
>>
>> If he needed it an expression, he could wrap it in a parameterized
>> function, if we added those to  the language.
>>
>> When someone asks for a syntax enhancement, let's also consider
>> whether the real need might be for an extensibility enhancement.
>>
>> -- Brad
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