replaces subtraction with XOR in FLUSH

e601c7d8 · Moritz Hanke · Mathis Rosenhauer · 9af97721 · e601c7d8
Commit e601c7d8 authored Sep 09, 2014 by Moritz Hanke Committed by Mathis Rosenhauer Oct 24, 2014
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src/decode.c src/decode.c +3 -2

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--- 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);                     \