Document the differences between the two asm fragments in initMMX2HScaler().

git-svn-id: file:///var/local/repositories/mplayer/trunk/libswscale@29978 b3059339-0415-0410-9bf9-f77b7e298cf2

swscale.c

@@ -1697,6 +1697,12 @@ static int initMMX2HScaler(int dstW, int xInc, uint8_t *filterCode, int16_t *fil
     int xpos, i;
 
     // create an optimized horizontal scaling routine
+    /* This scaler is made of runtime-generated MMX2 code using specially
+     * tuned pshufw instructions. For every four output pixels, if four
+     * input pixels are enough for the fast bilinear scaling, then a chunk
+     * of fragmentB is used. If five input pixels are needed, then a chunk
+     * of fragmentA is used.
+     */
 
     //code fragment