mirror of https://github.com/zachjs/sv2v.git
47 lines
1.4 KiB
Haskell
47 lines
1.4 KiB
Haskell
{- sv2v
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- Author: Zachary Snow <zach@zachjs.com>
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-
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- Conversion for `inside` expressions
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-
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- The expressions are compared to each candidate using the wildcard comparison
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- operator. Note that if expression has any Xs or Zs that are not wildcarded in
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- the candidate, the results is `1'bx`. As required by the specification, the
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- result of each comparison is combined using an OR reduction.
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-
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- TODO: Add support for array value ranges.
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-}
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module Convert.Inside (convert) where
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import Convert.Traverse
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import Language.SystemVerilog.AST
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convert :: [AST] -> [AST]
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convert =
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map $
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traverseDescriptions $ traverseModuleItems $
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traverseExprs $ traverseNestedExprs convertExpr
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convertExpr :: Expr -> Expr
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convertExpr (Inside expr valueRanges) =
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if length checks == 1
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then head checks
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else UniOp RedOr $ Concat checks
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where
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checks = map toCheck valueRanges
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toCheck :: ExprOrRange -> Expr
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toCheck (Left e) =
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Mux
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(BinOp TNe rxr lxlxrxr)
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(Number "1'bx")
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(BinOp WEq expr e)
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where
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lxl = BinOp BitXor expr expr
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rxr = BinOp BitXor e e
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lxlxrxr = BinOp BitXor lxl rxr
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toCheck (Right (lo, hi)) =
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BinOp LogAnd
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(BinOp Le lo expr)
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(BinOp Ge hi expr)
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convertExpr other = other
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