CoreArity

Arity and eta expansion

Documentation

manifestArity :: CoreExpr -> Arity

manifestArity sees how many leading value lambdas there are, after looking through casts

joinRhsArity :: CoreExpr -> JoinArity

exprArity :: CoreExpr -> Arity

An approximate, fast, version of exprEtaExpandArity

typeArity :: Type -> [OneShotInfo]

exprEtaExpandArity :: DynFlags -> CoreExpr -> Arity

findRhsArity :: DynFlags -> Id -> CoreExpr -> Arity -> (Arity, Bool)

etaExpand

Arguments

:: Arity

Result should have this number of value args

-> CoreExpr

Expression to expand

-> CoreExpr

etaExpand n e returns an expression with the same meaning as e, but with arity n.

Given:

e' = etaExpand n e

We should have that:

ty = exprType e = exprType e'

etaExpandToJoinPoint :: JoinArity -> CoreExpr -> ([CoreBndr], CoreExpr)

Split an expression into the given number of binders and a body, eta-expanding if necessary. Counts value *and* type binders.

etaExpandToJoinPointRule :: JoinArity -> CoreRule -> CoreRule

exprBotStrictness_maybe :: CoreExpr -> Maybe (Arity, StrictSig)