Another micro-optimization for unpack_vlcs(): Eliminate a possible

branch and save around 45k-55k dezicycles per function run. Originally committed as revision 19974 to svn://svn.ffmpeg.org/ffmpeg/trunk
15 years ago · 428984b041
parent 4c0dda2b3f
commit 428984b041
1 changed files with 3 additions and 4 deletions
--- a/libavcodec/vp3.c
+++ b/libavcodec/vp3.c
@ -1070,10 +1070,9 @@ static int unpack_vlcs(Vp3DecodeContext *s, GetBitContext *gb,
                coeff = zero_run = 0;
            } else {
                bits_to_get = coeff_get_bits[token];
-                if (!bits_to_get)
-                    coeff = coeff_tables[token][0];
-                else
-                    coeff = coeff_tables[token][get_bits(gb, bits_to_get)];
+                if (bits_to_get)
+                    bits_to_get = get_bits(gb, bits_to_get);
+                coeff = coeff_tables[token][bits_to_get];

                zero_run = zero_run_base[token];
                if (zero_run_get_bits[token])