zlib_deflate/deftree: remove bi_reverse()

Remove bi_reverse() and use generic bitrev32() instead - it should have
better performance on some platforms.

Signed-off-by: yalin wang <yalin.wang2010@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 3 insertions, 3 deletions

diff --git a/lib/zlib_deflate/deftree.c b/lib/zlib_deflate/deftree.c
index ddf348299f24..9b1756b12743 100644
--- a/lib/zlib_deflate/deftree.c
+++ b/lib/zlib_deflate/deftree.c
@@ -35,6 +35,7 @@
 /* #include "deflate.h" */
 
 #include <linux/zutil.h>
+#include <linux/bitrev.h>
 #include "defutil.h"
 
 #ifdef DEBUG_ZLIB
@@ -146,7 +147,6 @@ static void send_all_trees (deflate_state *s, int lcodes, int dcodes,
 static void compress_block (deflate_state *s, ct_data *ltree,
                            ct_data *dtree);
 static void set_data_type  (deflate_state *s);
-static unsigned bi_reverse (unsigned value, int length);
 static void bi_windup      (deflate_state *s);
 static void bi_flush       (deflate_state *s);
 static void copy_block     (deflate_state *s, char *buf, unsigned len,
@@ -284,7 +284,7 @@ static void tr_static_init(void)
     /* The static distance tree is trivial: */
     for (n = 0; n < D_CODES; n++) {
         static_dtree[n].Len = 5;
-        static_dtree[n].Code = bi_reverse((unsigned)n, 5);
+        static_dtree[n].Code = bitrev32((u32)n) >> (32 - 5);
     }
     static_init_done = 1;
 }
@@ -520,7 +520,7 @@ static void gen_codes(
         int len = tree[n].Len;
         if (len == 0) continue;
         /* Now reverse the bits */
-        tree[n].Code = bi_reverse(next_code[len]++, len);
+        tree[n].Code = bitrev32((u32)(next_code[len]++)) >> (32 - len);
 
         Tracecv(tree != static_ltree, (stderr,"\nn %3d %c l %2d c %4x (%x) ",
              n, (isgraph(n) ? n : ' '), len, tree[n].Code, next_code[len]-1));