From f4c1f506171e2eef475d0b63234217757d4921d2 Mon Sep 17 00:00:00 2001
From: orignal <i2porignal@yandex.ru>
Date: Thu, 11 May 2017 12:47:07 -0400
Subject: [PATCH] eliminate extra copy

---
 gost/cuda_gosthash.cu | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/gost/cuda_gosthash.cu b/gost/cuda_gosthash.cu
index 6d6f8e5..384c744 100644
--- a/gost/cuda_gosthash.cu
+++ b/gost/cuda_gosthash.cu
@@ -711,9 +711,14 @@ __device__
 static void GOST_E12(uint64_t* const K, uint64_t *state)
 {
 	uint64_t state1[8], K1[8];	
-	GOST_Copy512(K1, K);	
-	#pragma unroll 4
-	for(int i=0; i<12; i++)
+
+	GOST_Xor512(state1, K, CC[0]);
+	GOST_FS(state1, K1);
+	GOST_FS(state, state1);
+	GOST_Xor512(state, state1, K1);
+
+	#pragma unroll 5
+	for(int i=1; i<12; i++)
 	{
 		GOST_Xor512(state1, K1, CC[i]);
 		GOST_FS(state1, K1);