Re: [sv-bc] FW: Manti 1345, 1711: unique if/case

From: Steven Sharp <sharp_at_.....>
Date: Mon Nov 19 2007 - 12:27:23 PST
>From: Gordon Vreugdenhil <gordonv@model.com>

>I do agree that requiring a top-down ordering could be required
>but only until encountering a case that warns.  So once you
>issue a warning, no further evaluation is required and whether
>evaluation of case items which are between the first match
>and the match which conceptually causes the warning is implementation
>defined.
>
>I think that gives us a reasonable approach -- if you have a
>well-formed unique case, then you get top-down predictability.
>Only when you have an ill-formed case, do you lose some predictability.
>While I agree with Steven that I don't want to penalize *all*
>side-effects, I don't mind penalizing an ill-formed unique case
>with side-effects.

I don't have a problem with the idea of this approach.  However, I
think it would be difficult to write clear LRM text describing this
idea of a match which conceptually causes a warning.  It would be a
lot of text to describe a situation which doesn't seem common enough
to warrant it.

Steven Sharp
sharp@cadence.com


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Received on Mon Nov 19 12:27:41 2007

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