reverted possible speedup.

libethash-cuda/dagger_shuffled.cuh

@@ -76,7 +76,7 @@ __device__ uint64_t compute_hash_shuffle(
 		uint32_t thread_mix = fnv_reduce(mix);
 
 		// update mix accross threads
-		/*
+		
 		shuffle[0].x = __shfl(thread_mix, start_lane + 0);
 		shuffle[0].y = __shfl(thread_mix, start_lane + 1);
 		shuffle[1].x = __shfl(thread_mix, start_lane + 2);
@@ -85,30 +85,15 @@ __device__ uint64_t compute_hash_shuffle(
 		shuffle[2].y = __shfl(thread_mix, start_lane + 5);
 		shuffle[3].x = __shfl(thread_mix, start_lane + 6);
 		shuffle[3].y = __shfl(thread_mix, start_lane + 7);
-		*/
+		
 		if (i == thread_id) {
 			//move mix into state:
-			state[8].x = __shfl(thread_mix, start_lane + 0);
-			state[8].y = __shfl(thread_mix, start_lane + 1);
-			state[9].x = __shfl(thread_mix, start_lane + 2);
-			state[9].y = __shfl(thread_mix, start_lane + 3);
-			state[10].x = __shfl(thread_mix, start_lane + 4);
-			state[10].y = __shfl(thread_mix, start_lane + 5);
-			state[11].x = __shfl(thread_mix, start_lane + 6);
-			state[11].y = __shfl(thread_mix, start_lane + 7);
+			state[8] = shuffle[0];
+			state[9] = shuffle[1];
+			state[10] = shuffle[2];
+			state[11] = shuffle[3];
 		}
-		/*
-		else {
-			shuffle[0].x = __shfl(thread_mix, start_lane + 0);
-			shuffle[0].y = __shfl(thread_mix, start_lane + 1);
-			shuffle[1].x = __shfl(thread_mix, start_lane + 2);
-			shuffle[1].y = __shfl(thread_mix, start_lane + 3);
-			shuffle[2].x = __shfl(thread_mix, start_lane + 4);
-			shuffle[2].y = __shfl(thread_mix, start_lane + 5);
-			shuffle[3].x = __shfl(thread_mix, start_lane + 6);
-			shuffle[3].y = __shfl(thread_mix, start_lane + 7);
-		}
-		*/
+
 	}
 	
 	// keccak_256(keccak_512(header..nonce) .. mix);