Verilator uses undeclared helper function for power op > 64 bits

[veripoolbot]

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Author Name: Clifford Wolf (@cliffordwolf)
Original Redmine Issue: 761 from https://www.veripool.org

Original Assignee: Wilson Snyder (@wsnyder)

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Verilator 621c515 creates code that uses the undeclared function VL_POW_WWI:

  input [3:0] a;
  output [3:0] y;
  assign y = 65'd2 ** a;
endmodule

The gcc error message is:

Vissue_040.cpp:83:63: error: ‘VL_POW_WWI’ was not declared in this scope
      VL_POW_WWI(65,65,4, __Vtemp3, __Vtemp2, (IData)(vlTOPp->a));

[veripoolbot]

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Original Redmine Comment
Author Name: Wilson Snyder (@wsnyder)
Original Date: 2014-05-10T12:26:33Z

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VCS at least does not support this, so it must not be common in the wild so I won't support it either.

If someone wants to write and test the appropriate math functions I'll take a patch, until then I added an Unsupported error message.

[veripoolbot]

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Original Redmine Comment
Author Name: Wilson Snyder (@wsnyder)
Original Date: 2017-06-06T00:30:05Z

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Fixed in git towards 3.905.

[veripoolbot]

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Original Redmine Comment
Author Name: Wilson Snyder (@wsnyder)
Original Date: 2017-06-22T22:38:01Z

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In 3.906.