hash: add local variable

[vpp.git] / src / vppinfra / crc32.h

diff --git a/src/vppinfra/crc32.h b/src/vppinfra/crc32.h
index 3b81daf..2b20fef 100644 (file)
--- a/src/vppinfra/crc32.h
+++ b/src/vppinfra/crc32.h
@@ -76,23 +76,27 @@ clib_crc32c_u64 (u32 last, u64 data)
 
 #ifdef clib_crc32c_uses_intrinsics
 static_always_inline u32
-clib_crc32c (u8 * s, int len)
+clib_crc32c_with_init (u8 *s, int len, u32 last)
 {
-  u32 v = 0;
-
   for (; len >= 8; len -= 8, s += 8)
-    v = clib_crc32c_u64 (v, *((u64u *) s));
+    last = clib_crc32c_u64 (last, *((u64u *) s));
 
   for (; len >= 4; len -= 4, s += 4)
-    v = clib_crc32c_u32 (v, *((u32u *) s));
+    last = clib_crc32c_u32 (last, *((u32u *) s));
 
   for (; len >= 2; len -= 2, s += 2)
-    v = clib_crc32c_u16 (v, *((u16u *) s));
+    last = clib_crc32c_u16 (last, *((u16u *) s));
 
   for (; len >= 1; len -= 1, s += 1)
-    v = clib_crc32c_u8 (v, *((u8 *) s));
+    last = clib_crc32c_u8 (last, *((u8 *) s));
+
+  return last;
+}
 
-  return v;
+static_always_inline u32
+clib_crc32c (u8 *s, int len)
+{
+  return clib_crc32c_with_init (s, len, 0);
 }
 #endif