Remove un-taken branching from levels 1-3:
Remove un-taken branching from levels 1-3:

benchmark              old MB/s     new MB/s     speedup
BenchmarkGzipL1        53.98        56.60        1.05x
BenchmarkGzipL2        52.07        51.12        0.98x
BenchmarkGzipL3        43.44        49.49        1.14x
BenchmarkGzipL4        37.97        38.70        1.02x
BenchmarkGzipL5        30.31        31.11        1.03x
BenchmarkGzipL6        26.93        27.66        1.03x
BenchmarkGzipL7        21.39        21.63        1.01x
BenchmarkGzipL8        11.16        11.09        0.99x
BenchmarkGzipL9        10.68        10.73        1.00x

yxd-hde/compress,aybabtme/compress,shishkander/compress,rahulsingh71/compress,glycerine/compress,yxd-hde/compress