From 5db8000cef4389590e8f2b8108c62ba88ffdfbd2 Mon Sep 17 00:00:00 2001
From: psychocrypt <psychocryptHPC@gmail.com>
Date: Mon, 16 Jul 2018 20:57:58 +0200
Subject: [PATCH] NVIDIA bittube2 improvement
5% more hash per second
---
xmrstak/backend/nvidia/nvcc_code/cuda_core.cu | 17 +++++++++--------
1 file changed, 9 insertions(+), 8 deletions(-)
diff --git a/xmrstak/backend/nvidia/nvcc_code/cuda_core.cu b/xmrstak/backend/nvidia/nvcc_code/cuda_core.cu
index 39f51ea..6c64751 100644
--- a/xmrstak/backend/nvidia/nvcc_code/cuda_core.cu
+++ b/xmrstak/backend/nvidia/nvcc_code/cuda_core.cu
@@ -268,26 +268,27 @@ __global__ void cryptonight_core_gpu_phase2( int threads, int bfactor, int parti
k[2] = shuffle<4>(sPtr,sub, k[0], sub + 2);
k[3] = shuffle<4>(sPtr,sub, k[0], sub + 3);
- uint32_t r;
-
#pragma unroll 4
for(int i = 0; i < 4; ++i)
{
// only calculate the key if all data are up to date
if(i == sub)
{
- r = a ^
+ d[x] = a ^
t_fn0( k[0] & 0xff ) ^
t_fn1( (k[1] >> 8) & 0xff ) ^
t_fn2( (k[2] >> 16) & 0xff ) ^
t_fn3( (k[3] >> 24 ) );
}
- /* avoid negative number for modulo
- * load valid key (k) depending on the round
- */
- k[(4 - sub + i)%4] = shuffle<4>(sPtr,sub, k[0] ^ r, i);
+ // the last shuffle is not needed
+ if(i != 3)
+ {
+ /* avoid negative number for modulo
+ * load valid key (k) depending on the round
+ */
+ k[(4 - sub + i)%4] = shuffle<4>(sPtr,sub, k[0] ^ d[x], i);
+ }
}
- d[x] = r;
}
else
{
--
GitLab