Make a BinderAndDecls data type, at first just a wrapper around Binder.
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…nder`. Next we'll actually make decls part of it. But that will involve substantive changes. This first step just makes the type distinct from `Binder` so we can make all the administrative changes while still passing tests.
axch
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Jul 11, 2023
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| -- XXX: this is wrong. We need to add a mechanism for specifying commutativity | ||
| isAdditionMonoid :: BaseMonoid SimpIR n -> Maybe () | ||
| isAdditionMonoid monoid = do | ||
| BaseMonoid { baseEmpty = (Con (Lit l)) | ||
| , baseCombine = BinaryLamExpr (b1:>_) (b2:>_) body } <- Just monoid | ||
| , baseCombine = BinaryLamExpr _ _ _ } <- Just monoid | ||
| unless (_isZeroLit l) Nothing | ||
| PrimOp (BinOp op (Var b1') (Var b2')) <- exprBlock body | ||
| unless (op `elem` [P.IAdd, P.FAdd]) Nothing | ||
| case (binderName b1, atomVarName b1', binderName b2, atomVarName b2') of | ||
| -- Checking the raw names here because (i) I don't know how to convince the | ||
| -- name system to let me check the well-typed names (which is because b2 | ||
| -- might shadow b1), and (ii) there are so few patterns that I can just | ||
| -- enumerate them. | ||
| (UnsafeMakeName n1, UnsafeMakeName n1', UnsafeMakeName n2, UnsafeMakeName n2') -> do | ||
| when (n1 == n2) Nothing | ||
| unless ((n1 == n1' && n2 == n2') || (n1 == n2' && n2 == n1')) Nothing | ||
| Just () |
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That's true, but is there actually a reason to delete it? Without a check like this, the vectorizer will cheerfully reorder operations in arbitrary monoids, which may in principle emit incorrect code from a correct program.
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Next we'll actually make decls part of it. But that will involve substantive changes. This first step just makes the type distinct from
Binderso we can make all the administrative changes while still passing tests.