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Remove branch in increment counter

pull/161/head
Jeffrey Walton 2016-04-21 19:53:04 -04:00
parent da05d100e3
commit 433f2d6566
1 changed files with 4 additions and 3 deletions
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5
chacha.cpp Executable file → Normal file
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@ -117,6 +117,7 @@ void ChaCha_Policy<R>::OperateKeystream(KeystreamOperation operation, byte *outp
CHACHA_QUARTER_ROUND(x3, x4, x9, x14);
}
#undef CHACHA_OUTPUT
#define CHACHA_OUTPUT(x){\
CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 0, x0 + m_state[0]);\
CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, LITTLE_ENDIAN_ORDER, 1, x1 + m_state[1]);\
@ -139,8 +140,8 @@ void ChaCha_Policy<R>::OperateKeystream(KeystreamOperation operation, byte *outp
CRYPTOPP_KEYSTREAM_OUTPUT_SWITCH(CHACHA_OUTPUT, BYTES_PER_ITERATION);
#endif
if (++m_state[12] == 0)
++m_state[13];
++m_state[12];
m_state[13] += !!(m_state[12] == 0);
}
}