Single symbol explosion

[piotr-sneller]

If the input is composed of only one character, e.g. "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa", the compressed output size is double the input size:

ANS input size: 72, output size 148, compression ratio -105.555556%

If another character is introduced, e.g. "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaab", the excellent compression ratio is restored:
ANS input size: 72, output size 4, compression ratio 94.444444%

I tested it on the scalar version of rans_word_sse41.h.