Commit 8967fcaf authored by Ronald S. Bultje's avatar Ronald S. Bultje
Browse files

Add comment for use of shift/mul instead of div.

Change-Id: Ia6a0090da2097ca9337f8179a6d7b6a09e12f2e6
parent 980ca632
......@@ -109,6 +109,9 @@ int vp8_ac2quant(int QIndex, int Delta)
else if (QIndex < 0)
QIndex = 0;
/* For all x in [0..284], x*155/100 is bitwise equal to (x*101581) >> 16.
* The smallest precision for that is '(x*6349) >> 12' but 16 is a good
* word size. */
retval = (ac_qlookup[ QIndex ] * 101581) >> 16;
if (retval < 8)
......
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