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Assign t and v together in Sosemanuk (Issue 449) 

This saved about 0.1 cpb, and increased throughput to 1536 MiB/s
pull/450/head
Jeffrey Walton 2017-07-28 01:34:53 -04:00
parent ed4c345ce8
commit ade3b319a9
No known key found for this signature in database
GPG Key ID: B36AB348921B1838
1 changed files with 3 additions and 4 deletions
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sosemanuk.cpp
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@ -638,9 +638,8 @@ void SosemanukPolicy::OperateKeystream(KeystreamOperation operation, byte *outpu
#define STEP(x0, x1, x2, x3, x4, x5, x6, x7, x8, x9, v, u) \ #define STEP(x0, x1, x2, x3, x4, x5, x6, x7, x8, x9, v, u) \
u = (s##x9 + r2(x0)) ^ r1(x0);\ u = (s##x9 + r2(x0)) ^ r1(x0);\
v = s##x0;\ t = v = s##x0;\
w = s##x0;\ s##x0 = MUL_A(t) ^ DIV_A(s##x3) ^ s##x9;\
s##x0 = MUL_A(w) ^ DIV_A(s##x3) ^ s##x9;\
r1(x0) += XMUX(r2(x0), s##x2, s##x9);\ r1(x0) += XMUX(r2(x0), s##x2, s##x9);\
r2(x0) = rotlFixed(r2(x0) * 0x54655307, 7);\ r2(x0) = rotlFixed(r2(x0) * 0x54655307, 7);\
@ -666,7 +665,7 @@ void SosemanukPolicy::OperateKeystream(KeystreamOperation operation, byte *outpu
word32 s9 = m_state[9]; word32 s9 = m_state[9];
word32 reg1 = m_state[10]; word32 reg1 = m_state[10];
word32 reg2 = m_state[11]; word32 reg2 = m_state[11];
word32 u0, u1, u2, u3, u4, v0, v1, v2, v3, w; word32 t, u0, u1, u2, u3, u4, v0, v1, v2, v3;
do do
{ {