| Safe Haskell | Safe-Inferred |
|---|---|
| Language | GHC2021 |
Futhark.Analysis.DataDependencies
Description
Facilities for inspecting the data dependencies of a program.
Synopsis
- type Dependencies = Map VName Names
- dataDependencies :: ASTRep rep => Body rep -> Dependencies
- depsOf :: Dependencies -> SubExp -> Names
- depsOf' :: SubExp -> Names
- depsOfArrays :: SubExp -> [VName] -> [Names]
- depsOfShape :: Shape -> Names
- lambdaDependencies :: ASTRep rep => Dependencies -> Lambda rep -> [Names] -> [Names]
- reductionDependencies :: ASTRep rep => Dependencies -> Lambda rep -> [SubExp] -> [Names] -> [Names]
- findNecessaryForReturned :: (Param dec -> Bool) -> [(Param dec, SubExp)] -> Map VName Names -> Names
Documentation
type Dependencies = Map VName Names Source #
A mapping from a variable name v, to those variables on which
the value of v is dependent. The intuition is that we could
remove all other variables, and v would still be computable.
This also includes names bound in loops or by lambdas.
dataDependencies :: ASTRep rep => Body rep -> Dependencies Source #
Compute the data dependencies for an entire body.
depsOfShape :: Shape -> Names Source #
lambdaDependencies :: ASTRep rep => Dependencies -> Lambda rep -> [Names] -> [Names] Source #
Determine the variables on which the results of applying
anonymous function lam to inputs depend.
reductionDependencies :: ASTRep rep => Dependencies -> Lambda rep -> [SubExp] -> [Names] -> [Names] Source #
Like lambdaDependencies, but lam is a binary operation
with a neutral element.
findNecessaryForReturned :: (Param dec -> Bool) -> [(Param dec, SubExp)] -> Map VName Names -> Names Source #
findNecessaryForReturned p merge deps computes which of the
loop parameters (merge) are necessary for the result of the loop,
where p given a loop parameter indicates whether the final value
of that parameter is live after the loop. deps is the data
dependencies of the loop body. This is computed by straightforward
fixpoint iteration.