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#include "cuda_helper.h"
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// globaler Speicher f<EFBFBD>r unsere Ergebnisse
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uint32_t *d_hashoutput[8];
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extern uint32_t *d_hash2output[8];
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extern uint32_t *d_hash3output[8];
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extern uint32_t *d_hash4output[8];
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extern uint32_t *d_hash5output[8];
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extern uint32_t *d_nonceVector[8];
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/* Combines top 64-bits from each hash into a single hash */
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static void __device__ combine_hashes(uint32_t *out, uint32_t *hash1, uint32_t *hash2, uint32_t *hash3, uint32_t *hash4)
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{
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uint32_t lout[8]; // Combining in Registern machen
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#pragma unroll 8
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for (int i=0; i < 8; ++i)
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lout[i] = 0;
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// das Makro setzt jeweils 4 Bits aus vier verschiedenen Hashes zu einem Nibble zusammen
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#define MIX(bits, mask, i) \
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lout[(255 - (bits+3))/32] <<= 4; \
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if ((hash1[i] & mask) != 0) lout[(255 - (bits+0))/32] |= 8; \
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if ((hash2[i] & mask) != 0) lout[(255 - (bits+1))/32] |= 4; \
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if ((hash3[i] & mask) != 0) lout[(255 - (bits+2))/32] |= 2; \
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if ((hash4[i] & mask) != 0) lout[(255 - (bits+3))/32] |= 1; \
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/* Transpose first 64 bits of each hash into out */
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MIX( 0, 0x80000000, 7);
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MIX( 4, 0x40000000, 7);
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MIX( 8, 0x20000000, 7);
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MIX( 12, 0x10000000, 7);
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MIX( 16, 0x08000000, 7);
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MIX( 20, 0x04000000, 7);
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MIX( 24, 0x02000000, 7);
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MIX( 28, 0x01000000, 7);
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MIX( 32, 0x00800000, 7);
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MIX( 36, 0x00400000, 7);
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MIX( 40, 0x00200000, 7);
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MIX( 44, 0x00100000, 7);
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MIX( 48, 0x00080000, 7);
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MIX( 52, 0x00040000, 7);
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MIX( 56, 0x00020000, 7);
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MIX( 60, 0x00010000, 7);
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MIX( 64, 0x00008000, 7);
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MIX( 68, 0x00004000, 7);
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MIX( 72, 0x00002000, 7);
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MIX( 76, 0x00001000, 7);
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MIX( 80, 0x00000800, 7);
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MIX( 84, 0x00000400, 7);
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MIX( 88, 0x00000200, 7);
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MIX( 92, 0x00000100, 7);
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MIX( 96, 0x00000080, 7);
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MIX(100, 0x00000040, 7);
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MIX(104, 0x00000020, 7);
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MIX(108, 0x00000010, 7);
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MIX(112, 0x00000008, 7);
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MIX(116, 0x00000004, 7);
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MIX(120, 0x00000002, 7);
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MIX(124, 0x00000001, 7);
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MIX(128, 0x80000000, 6);
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MIX(132, 0x40000000, 6);
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MIX(136, 0x20000000, 6);
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MIX(140, 0x10000000, 6);
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MIX(144, 0x08000000, 6);
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MIX(148, 0x04000000, 6);
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MIX(152, 0x02000000, 6);
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MIX(156, 0x01000000, 6);
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MIX(160, 0x00800000, 6);
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MIX(164, 0x00400000, 6);
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MIX(168, 0x00200000, 6);
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MIX(172, 0x00100000, 6);
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MIX(176, 0x00080000, 6);
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MIX(180, 0x00040000, 6);
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MIX(184, 0x00020000, 6);
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MIX(188, 0x00010000, 6);
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MIX(192, 0x00008000, 6);
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MIX(196, 0x00004000, 6);
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MIX(200, 0x00002000, 6);
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MIX(204, 0x00001000, 6);
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MIX(208, 0x00000800, 6);
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MIX(212, 0x00000400, 6);
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MIX(216, 0x00000200, 6);
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MIX(220, 0x00000100, 6);
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MIX(224, 0x00000080, 6);
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MIX(228, 0x00000040, 6);
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MIX(232, 0x00000020, 6);
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MIX(236, 0x00000010, 6);
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MIX(240, 0x00000008, 6);
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MIX(244, 0x00000004, 6);
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MIX(248, 0x00000002, 6);
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MIX(252, 0x00000001, 6);
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#pragma unroll 8
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for (int i=0; i < 8; ++i)
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out[i] = lout[i];
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}
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__global__ void combine_gpu_hash(int threads, uint32_t startNounce, uint32_t *out, uint32_t *hash2, uint32_t *hash3, uint32_t *hash4, uint32_t *hash5, uint32_t *nonceVector)
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{
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int thread = (blockDim.x * blockIdx.x + threadIdx.x);
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if (thread < threads)
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{
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uint32_t nounce = nonceVector[thread];
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uint32_t hashPosition = nounce - startNounce;
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// Die Aufgabe der combine-funktion besteht aus zwei Teilen.
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// 1) Komprimiere die hashes zu einem kleinen Array
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// 2) Errechne dort den combines-value
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// Die Kompression wird dadurch verwirklicht, dass im out-array weiterhin mit "thread" indiziert
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// wird. Die anderen Werte werden mit der nonce indiziert
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combine_hashes(&out[8 * thread], &hash2[8 * hashPosition], &hash3[16 * hashPosition], &hash4[16 * hashPosition], &hash5[16 * hashPosition]);
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}
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}
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// Setup-Funktionen
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__host__ void combine_cpu_init(int thr_id, int threads)
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{
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// Speicher f<EFBFBD>r alle Ergebnisse belegen
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cudaMalloc(&d_hashoutput[thr_id], 8 * sizeof(uint32_t) * threads);
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}
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void combine_cpu_hash(int thr_id, int threads, uint32_t startNounce, uint32_t *hash)
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{
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// diese Kopien sind optional, da die Hashes jetzt bereits auf der GPU liegen sollten
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const int threadsperblock = 128;
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// berechne wie viele Thread Blocks wir brauchen
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dim3 grid((threads + threadsperblock-1)/threadsperblock);
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dim3 block(threadsperblock);
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// Gr<EFBFBD><EFBFBD>e des dynamischen Shared Memory Bereichs
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size_t shared_size = 0;
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combine_gpu_hash<<<grid, block, shared_size>>>(threads, startNounce, d_hashoutput[thr_id], d_hash2output[thr_id], d_hash3output[thr_id], d_hash4output[thr_id], d_hash5output[thr_id], d_nonceVector[thr_id]);
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// da die Hash Auswertung noch auf der CPU erfolgt, m<EFBFBD>ssen die Ergebnisse auf jeden Fall zum Host kopiert werden
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cudaMemcpy(hash, d_hashoutput[thr_id], 8 * sizeof(uint32_t) * threads, cudaMemcpyDeviceToHost);
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}
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