1 files changed, 14 insertions, 0 deletions
diff --git a/vendor/compiler_builtins/src/mem/impls.rs b/vendor/compiler_builtins/src/mem/impls.rs
index 815132425..72003a5c4 100644
--- a/vendor/compiler_builtins/src/mem/impls.rs
+++ b/vendor/compiler_builtins/src/mem/impls.rs
@@ -265,3 +265,17 @@ pub unsafe fn set_bytes(mut s: *mut u8, c: u8, mut n: usize) {
     }
     set_bytes_bytes(s, c, n);
 }
+
+#[inline(always)]
+pub unsafe fn compare_bytes(s1: *const u8, s2: *const u8, n: usize) -> i32 {
+    let mut i = 0;
+    while i < n {
+        let a = *s1.add(i);
+        let b = *s2.add(i);
+        if a != b {
+            return a as i32 - b as i32;
+        }
+        i += 1;
+    }
+    0
+}