diff options
Diffstat (limited to 'backends/lean/Base')
| -rw-r--r-- | backends/lean/Base/Primitives/Scalar.lean | 31 |
1 files changed, 0 insertions, 31 deletions
diff --git a/backends/lean/Base/Primitives/Scalar.lean b/backends/lean/Base/Primitives/Scalar.lean index bf6b01a6..3d90f1a5 100644 --- a/backends/lean/Base/Primitives/Scalar.lean +++ b/backends/lean/Base/Primitives/Scalar.lean @@ -1154,35 +1154,4 @@ instance (ty : ScalarTy) : DecidableEq (Scalar ty) := @[simp] theorem Scalar.neq_to_neq_val {ty} : ∀ {i j : Scalar ty}, (¬ i = j) ↔ ¬ i.val = j.val := by intro i j; cases i; cases j; simp --- -- We now define a type class that subsumes the various machine integer types, so --- -- as to write a concise definition for scalar_cast, rather than exhaustively --- -- enumerating all of the possible pairs. We remark that Rust has sane semantics --- -- and fails if a cast operation would involve a truncation or modulo. - --- class MachineInteger (t: Type) where --- size: Nat --- val: t -> Fin size --- ofNatCore: (n:Nat) -> LT.lt n size -> t - --- set_option hygiene false in --- run_cmd --- for typeName in [`UInt8, `UInt16, `UInt32, `UInt64, `USize].map Lean.mkIdent do --- Lean.Elab.Command.elabCommand (← `( --- namespace $typeName --- instance: MachineInteger $typeName where --- size := size --- val := val --- ofNatCore := ofNatCore --- end $typeName --- )) - --- -- Aeneas only instantiates the destination type (`src` is implicit). We rely on --- -- Lean to infer `src`. - --- def scalar_cast { src: Type } (dst: Type) [ MachineInteger src ] [ MachineInteger dst ] (x: src): Result dst := --- if h: MachineInteger.val x < MachineInteger.size dst then --- .ret (MachineInteger.ofNatCore (MachineInteger.val x).val h) --- else --- .fail integerOverflow - end Primitives |