RE: [sv-bc] confusion in evalution of assignment pattern for structure array with more matching type keys than actual structure member

From: Bresticker, Shalom <shalom.bresticker_at_.....>
Date: Thu Aug 30 2007 - 06:11:32 PDT
I would think that the second approach is correct, as in 1800-2005,
8.13.1, in the paragraph beginning, "For type:value," ends, "If more
than one type matches the same element, the last value shall be used."

Shalom 

>      Consider the scenario,
> 
>      typedef struct  {
>           bit    r1;
>           logic  r2;
>      } node;
>      .....................
>       node p[1:0];
>      .....................
>      .......................
>      p =  '{'{ bit:1'b0, logic: 1'b1, bit: 1'b1, logic: 1'b0 
> },'{bit : 
> 1'b0, logic : 1'b1 , bit : 1'b1 , logic : 1'b0 } } ;
>     
>      The value of the of p after assigning the assignement 
> pattern  '{'{ bit : 1'b0, logic : 1'b1 , bit : 1'b1 , logic : 
> 1'b0 }, '{bit : 1'b0, logic : 1'b1 , bit : 1'b1 , logic : 
> 1'b0 } can be different if we follow two different approachs 
> for evaluation of the above assignment pattern for p.
> 
>      First approach :
>  
>                 if we consider bit : 1'b0  and  bit : 1'b0 
> for structure member r1 of p[1] and p[0] &  logic : 1'b1 and 
> logic : 1'b1 for structure  member  r2 of p[1] and p[0] then 
> the  resulting array p  will contains  value  '{'{1'b0, 
> 1'b1},'{1'b0, 1'b1}}, as we take the value associated with 
> key, which matches with the type of the r1 and r2 for p[1] 
> and p[0] first.
> 
>      Second approach :
> 
>                 if we consider  bit : 1'b1  and  bit : 1 'b1 
> for structure member r1 of p[1] and p[0]  &  logic : 1'b0 and 
> logic : 1'b0 for structure member  r2  of  p[1] and p[0]  
> then the  resulting  array p  will contains value '{'{1'b1, 
> 1'b0},'{1'b1, 1'b0}} as we take the value associated with 
> key, which matches with the type of the r1 and r2 for p[1] 
> and p[0] last.
> 
> Can someone tell me what would be the right  behaviour for 
> the above scenario.

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Received on Thu Aug 30 06:11:51 2007

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