From: Moritz Hanke <hanke@dkrz.de>
Date: Tue, 9 Sep 2014 14:56:05 +0000 (+0200)
Subject: replaces subtraction with XOR in FLUSH
X-Git-Tag: accepted/tizen/5.0/unified/20181102.025501~49
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=e601c7d8712fca7a3b6e1b8e89ea2b7b0bd08a26;p=platform%2Fupstream%2Flibaec.git

replaces subtraction with XOR in FLUSH
---

diff --git a/src/decode.c b/src/decode.c
index a8c0afc..22487fd 100644
--- a/src/decode.c
+++ b/src/decode.c
@@ -105,10 +105,11 @@
                           data = d;                                     \
                       }                                                 \
                   } else {                                              \
-                      if (half_d <= xmax - data) {                      \
+                      /*in this case (xmax - data == xmax ^ data)*/     \
+                      if (half_d <= (xmax ^ data)) {                    \
                           data += (d >> 1)^(~((d & 1) - 1));            \
                       } else {                                          \
-                          data = xmax - d;                              \
+                          data = xmax ^ d;                              \
                       }                                                 \
                   }                                                     \
                   put_##KIND(strm, (uint32_t)data);                     \