Issue #392: Can't unroll generate for with complicated incrementer/init/test - Verilator - Veripool

Issue #392

Status:

Feature

Start date:

09/19/2011

Priority:

Normal

Due date:

Assignee:

% Done:

Category:

Unsupported

Target version:

Description

The following for loop:

genvar x;
...
for( x = 1; x < 24; x = ( x == 5 ) ? 10 : x + 1 )

Generates an error

Unsupported: Can't unroll generate for; missing add/sub for incrementer
For loop doesn't have genvar index, or is malformed

Yes, the unroller is currently pretty stupid. I'll get to this, but it is unlikely to be in the next month as it is a fairly large chunk of work.

BTW, using a temporary parameter may work (I'm not sure if a genvar temporary would or wouldn't.)

genvar y;
 generate for( y = 1; y < 24-5; y = y + 1 ) 
   parameter x = (y&lt;5) ? y : (y+5);  // 0..4, 10..

Subject changed from Can't unroll generate for with complicated incrementer to Can't unroll generate for with complicated incrementer/init/test

Note the unroller also requires a simple initialization and condition.

If someone would like to try to patch this I can provide guidance; it should be a fairly easy starter project.

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