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-rw-r--r--backends/lean/Base/Primitives/Scalar.lean10
1 files changed, 10 insertions, 0 deletions
diff --git a/backends/lean/Base/Primitives/Scalar.lean b/backends/lean/Base/Primitives/Scalar.lean
index b8d93d30..be930754 100644
--- a/backends/lean/Base/Primitives/Scalar.lean
+++ b/backends/lean/Base/Primitives/Scalar.lean
@@ -1394,6 +1394,16 @@ 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
simp [eq_equiv]
+instance (ty: ScalarTy) : Preorder (Scalar ty) where
+ le_refl := fun a => by simp
+ le_trans := fun a b c => by
+ intro Hab Hbc
+ exact (le_trans ((Scalar.le_equiv _ _).1 Hab) ((Scalar.le_equiv _ _).1 Hbc))
+ lt_iff_le_not_le := fun a b => by
+ trans (a: Int) < (b: Int); exact (Scalar.lt_equiv _ _)
+ trans (a: Int) ≤ (b: Int) ∧ ¬ (b: Int) ≤ (a: Int); exact lt_iff_le_not_le
+ repeat rewrite [← Scalar.le_equiv]; rfl
+
-- Leading zeros
def core.num.Usize.leading_zeros (x : Usize) : U32 := sorry
def core.num.U8.leading_zeros (x : U8) : U32 := sorry