From: Nathan Moinvaziri <nathan@nathanm.com>
Date: Fri, 11 Jun 2021 01:03:08 +0000 (-0700)
Subject: Remove extra division operation in chunkcopy.
X-Git-Tag: 2.1.0-beta1~535
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b937afdc758381a152390342e281ac1e51033ebd;p=thirdparty%2Fzlib-ng.git

Remove extra division operation in chunkcopy.
---

diff --git a/chunkset_tpl.h b/chunkset_tpl.h
index ff760fcf6..1018aac3a 100644
--- a/chunkset_tpl.h
+++ b/chunkset_tpl.h
@@ -20,18 +20,18 @@ Z_INTERNAL uint32_t CHUNKSIZE(void) {
 Z_INTERNAL uint8_t* CHUNKCOPY(uint8_t *out, uint8_t const *from, unsigned len) {
     Assert(len > 0, "chunkcopy should never have a length 0");
     chunk_t chunk;
-    int32_t align = (--len % sizeof(chunk_t)) + 1;
+    int32_t align = ((len - 1) % sizeof(chunk_t)) + 1;
     loadchunk(from, &chunk);
     storechunk(out, &chunk);
     out += align;
     from += align;
-    len /= sizeof(chunk_t);
+    len -= align;
     while (len > 0) {
         loadchunk(from, &chunk);
         storechunk(out, &chunk);
         out += sizeof(chunk_t);
         from += sizeof(chunk_t);
-        --len;
+        len -= sizeof(chunk_t);
     }
     return out;
 }