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| author | Son HO | 2024-05-21 11:01:13 +0200 |
|---|---|---|
| committer | GitHub | 2024-05-21 11:01:13 +0200 |
| commit | e07af56862e92efecb09209874ad24da77c0e001 (patch) | |
| tree | 0c98db6c77e8c53b7e2c117aba6407beb053f36e /backends/lean/Base/Primitives | |
| parent | dc8ceedffa0945b84f81e318fa78f1e55b1731d2 (diff) | |
| parent | d088e1adbfb20d6f3137b236f750b0ac5fed4f95 (diff) | |
Merge pull request #183 from RaitoBezarius/coercions
feat(backends/lean): make `max`-related coercions nicer
Diffstat (limited to 'backends/lean/Base/Primitives')
| -rw-r--r-- | backends/lean/Base/Primitives/Scalar.lean | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/backends/lean/Base/Primitives/Scalar.lean b/backends/lean/Base/Primitives/Scalar.lean index dccbcdf2..f08b8dec 100644 --- a/backends/lean/Base/Primitives/Scalar.lean +++ b/backends/lean/Base/Primitives/Scalar.lean @@ -1419,6 +1419,18 @@ instance (ty: ScalarTy) : LinearOrder (Scalar ty) where right; exact (Scalar.le_equiv _ _).2 H decidableLE := ScalarDecidableLE ty +-- Coercion theorems +-- This is helpful whenever you want to "push" casts to the innermost nodes +-- and make the cast normalization happen more magically. + +@[simp, norm_cast] +theorem coe_max {ty: ScalarTy} (a b: Scalar ty): ↑(Max.max a b) = (Max.max (↑a) (↑b): ℤ) := by + -- TODO: there should be a shorter way to prove this. + rw [max_def, max_def] + split_ifs <;> simp_all + refine' absurd _ (lt_irrefl a) + exact lt_of_le_of_lt (by assumption) ((Scalar.lt_equiv _ _).2 (by assumption)) + -- Leading zeros def core.num.Usize.leading_zeros (x : Usize) : U32 := sorry def core.num.U8.leading_zeros (x : U8) : U32 := sorry |