Assign t and v together in Sosemanuk (Issue 449)

This saved about 0.1 cpb, and increased throughput to 1536 MiB/s

1 files changed, 3 insertions, 4 deletions

diff --git a/sosemanuk.cpp b/sosemanuk.cpp
index 709ae756..48b78068 100644
--- a/sosemanuk.cpp
+++ b/sosemanuk.cpp
@@ -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)	\

 		u = (s##x9 + r2(x0)) ^ r1(x0);\

-		v = s##x0;\

-		w = s##x0;\

-		s##x0 = MUL_A(w) ^ DIV_A(s##x3) ^ s##x9;\

+		t = v = s##x0;\

+		s##x0 = MUL_A(t) ^ DIV_A(s##x3) ^ s##x9;\

 		r1(x0) += XMUX(r2(x0), s##x2, s##x9);\

 		r2(x0) = rotlFixed(r2(x0) * 0x54655307, 7);\

 

@@ -666,7 +665,7 @@ void SosemanukPolicy::OperateKeystream(KeystreamOperation operation, byte *outpu
 	word32 s9 = m_state[9];

 	word32 reg1 = m_state[10];

 	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

 	{