Futhark.Transform.FirstOrderTransform

The code generator cannot handle the array combinators (map and friends), so this module was written to transform them into the equivalent do-loops. The transformation is currently rather naive, and - it's certainly worth considering when we can express such transformations in-place.

Documentation

transformFunDef :: (MonadFreshNames m, FirstOrderLore tolore) => Scope tolore -> FunDef SOACS -> m (FunDef tolore)

transformStms :: (MonadFreshNames m, FirstOrderLore tolore) => Stms SOACS -> m (Stms tolore)

type FirstOrderLore lore = (Bindable lore, BinderOps lore, LetAttr SOACS ~ LetAttr lore, LParamAttr SOACS ~ LParamAttr lore, CanBeAliased (Op lore))

The constraints that must hold for a lore in order to be the target of first-order transformation.

type Transformer m = (MonadBinder m, LocalScope (Lore m) m, Bindable (Lore m), BinderOps (Lore m), LParamAttr SOACS ~ LParamAttr (Lore m), CanBeAliased (Op (Lore m)))

The constraints that a monad must uphold in order to be used for first-order transformation.

transformStmRecursively :: (Transformer m, LetAttr (Lore m) ~ LetAttr SOACS) => Stm -> m ()

First transform any nested Body or Lambda elements, then apply transformSOAC if the expression is a SOAC.

transformLambda :: (MonadFreshNames m, Bindable lore, BinderOps lore, LocalScope somelore m, SameScope somelore lore, LetAttr lore ~ LetAttr SOACS, CanBeAliased (Op lore)) => Lambda -> m (Lambda lore)

Recursively first-order-transform a lambda.

transformSOAC :: Transformer m => Pattern (Lore m) -> SOAC (Lore m) -> m ()

Transform a single SOAC into a do-loop. The body of the lambda is untouched, and may or may not contain further SOACs depending on the given lore.

transformBody :: (Transformer m, LetAttr (Lore m) ~ LetAttr SOACS) => Body -> m (Body (Lore m))