From: Nathan Moinvaziri <nathan@nathanm.com>
Date: Thu, 15 Jan 2026 04:17:53 +0000 (-0800)
Subject: Loop unroll for len >= 8 in crc32_copy_small.
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a454c2af8fd2c7b64a30c151d7f5f3a070f0889a;p=thirdparty%2Fzlib-ng.git

Loop unroll for len >= 8 in crc32_copy_small.
---

diff --git a/arch/generic/crc32_braid_c.c b/arch/generic/crc32_braid_c.c
index 0236fbcd4..008277015 100644
--- a/arch/generic/crc32_braid_c.c
+++ b/arch/generic/crc32_braid_c.c
@@ -200,10 +200,6 @@ Z_INTERNAL uint32_t crc32_braid_internal(uint32_t c, const uint8_t *buf, size_t
 #endif /* BRAID_W */
 
     /* Complete the computation of the CRC on any remaining bytes. */
-    while (len >= 8) {
-        len -= 8;
-        CRC_DO8;
-    }
     return crc32_copy_small(c, NULL, buf, len, 0);
 }
 
diff --git a/crc32_p.h b/crc32_p.h
index 37e9a4cf3..8f1d1d06c 100644
--- a/crc32_p.h
+++ b/crc32_p.h
@@ -13,12 +13,14 @@
 
 Z_FORCEINLINE static uint32_t crc32_copy_small(uint32_t crc, uint8_t *dst, const uint8_t *buf, size_t len, const int COPY) {
     uint32_t c = crc;
-
-    while (len) {
-        len--;
-        if (COPY) {
-            *dst++ = *buf;
-        }
+    if (COPY) {
+        memcpy(dst, buf, len);
+    }
+    while (len >= 8) {
+        len -= 8;
+        CRC_DO8;
+    }
+    while (len--) {
         CRC_DO1;
     }