RE: [sv-bc] Type of a concat expression

The description of casting says,

"When changing the size, the cast shall return the value that a packed array type with a single [n-1:0] dimension would hold after being assigned the expression, where n is the cast size. The signedness shall pass through unchanged, i.e., the signedness of the result shall be the self-determined signedness of the expression inside the cast. The array elements shall be of type bit if the expression inside the cast is 2-state, otherwise they shall be of type logic.

When changing the signing, the cast shall return the value that a packed array type with a single [n-1:0] dimension would hold after being assigned the expression, where n is the number of bits in the expression to be cast ($bits(expression)). The signedness of the result shall be the signedness specified by the cast type. The array elements shall be of type bit if the expression inside the cast is 2-state; otherwise, they shall be of type logic."

Shalom

> -----Original Message-----
> From: Steven Sharp [mailto:sharp@cadence.com]
> Sent: Monday, June 14, 2010 10:32 PM
> To: Bresticker, Shalom; spsaha@cal.interrasystems.com
> Cc: sv-bc@eda.org; pradip@cal.interrasystems.com;
> sghosh@cal.interrasystems.com
> Subject: Re: [sv-bc] Type of a concat expression
>
> The responses so far have covered all aspects of the type of
> an expression
> except the range. The LRM allows concatenations to be
> indexed as if they
> were packed arrays with a range [width-1:0]. It is
> reasonable to assume
> that this is also how type() would treat it.
>
> Other expressions cannot be indexed, so this was apparently
> never specified
> for them. Since comparisons of type() are based on matching
> types, and that
> includes comparisons of the ranges, their range becomes
> significant, and
> should have been specified. I assume everyone would agree
> that it should
> be specified the same way as concatenations, as [width-1:0]
>
>
> Steven Sharp | Architect | Cadence
>
> P: 508.459.1436 M: 774.535.4149 www.cadence.com
>
>
>
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