VERILOG054: Functions should have an “automatic” lifetime to be used in synthesizable code

Summary

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Reliability	Security	Maintainability	Code attribute	Effort to fix	Tags
HIGH	-	-	Intentionality | Logical	10min	synthesis, vscode, linter

Description

Noncompliant code example

function logic [2:0] foo( // Noncompliant: No "automatic" lifetime
  logic [2:0] a,
  logic [2:0] b
);
  return a ^ b;
endfunction : foo

Compliant solution

function automatic logic [2:0] foo(
  logic [2:0] a,
  logic [2:0] b
);
  return a ^ b;
endfunction : foo

Articles & blog posts

• lowRISC Verilog Coding Style Guide - Language Features - Functions and Tasks

Functions should have an automatic lifetime to be used in synthesizable code.

Parameters

No parameters.