perf: optimize String.compare (#13796)

This PR optimizes `String.compare` to turn it into 1 instead of 2 `memcmp` calls.
2026-05-20 13:57:48 +01:00 · 2026-05-20 13:57:48 +01:00 · a3fff15212
commit a3fff15212
parent 34df732066
1 changed files with 1 additions and 0 deletions
--- a/src/Init/Data/Ord/String.lean
+++ b/src/Init/Data/Ord/String.lean
@ -28,6 +28,7 @@ namespace String
 /--
 Lexicographic comparison of strings
 -/
+@[extern "lean_string_compare"]
 def compare (s₁ s₂ : @& String) : Ordering :=
  compareOfLessAndEq s₁ s₂