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also speed up the shifting of the mixed byte

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This commit is contained in:
Ahmet Inan 2018-09-23 17:13:05 +02:00
commit 4b7006651e
1 changed files with 3 additions and 3 deletions
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6
bose_chaudhuri_hocquenghem_encoder.hh
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@ -61,9 +61,9 @@ public:
set_be_bit(code, K+j-1, get_le_bit(generator, NP-j) != get_be_bit(code, K+j));
set_be_bit(code, N-1, get_le_bit(generator, 0));
} else {
for (int j = K; j < 8*((K+7)/8); ++j)
set_be_bit(code, j, get_be_bit(code, j+1));
for (int l = (K+7)/8; l < (N-1)/8; ++l)
uint8_t mask = (1<<(8-K%8))-1;
code[K/8] = (~mask&code[K/8]) | (mask&((code[K/8]<<1)|(code[K/8+1]>>7)));
for (int l = K/8+1; l < (N-1)/8; ++l)
code[l] = (code[l]<<1) | (code[l+1]>>7);
code[(N-1)/8] <<= 1;
}