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86 lines
2.2 KiB
86 lines
2.2 KiB
#include "ethash_cuda_miner_kernel_globals.h"
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#include "ethash_cuda_miner_kernel.h"
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#include "cuda_helper.h"
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__device__ uint64_t compute_hash(
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uint64_t nonce
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)
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{
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// sha3_512(header .. nonce)
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uint2 state[25];
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state[4] = vectorize(nonce);
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keccak_f1600_init(state);
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// Threads work together in this phase in groups of 8.
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const int thread_id = threadIdx.x & (THREADS_PER_HASH - 1);
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const int mix_idx = thread_id & 3;
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uint4 mix;
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uint2 shuffle[8];
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for (int i = 0; i < THREADS_PER_HASH; i++)
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{
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// share init among threads
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for (int j = 0; j < 8; j++) {
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shuffle[j].x = __shfl(state[j].x, i, THREADS_PER_HASH);
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shuffle[j].y = __shfl(state[j].y, i, THREADS_PER_HASH);
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}
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// ugly but avoids local reads/writes
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if (mix_idx < 2) {
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if (mix_idx == 0)
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mix = vectorize2(shuffle[0], shuffle[1]);
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else
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mix = vectorize2(shuffle[2], shuffle[3]);
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}
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else {
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if (mix_idx == 2)
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mix = vectorize2(shuffle[4], shuffle[5]);
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else
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mix = vectorize2(shuffle[6], shuffle[7]);
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}
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uint32_t init0 = __shfl(shuffle[0].x, 0, THREADS_PER_HASH);
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for (uint32_t a = 0; a < ACCESSES; a += 4)
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{
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int t = bfe(a, 2u, 3u);
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for (uint32_t b = 0; b < 4; b++)
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{
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if (thread_id == t)
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{
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shuffle[0].x = fnv(init0 ^ (a + b), ((uint32_t *)&mix)[b]) % d_dag_size;
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}
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shuffle[0].x = __shfl(shuffle[0].x, t, THREADS_PER_HASH);
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mix = fnv4(mix, d_dag[shuffle[0].x].uint4s[thread_id]);
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}
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}
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uint32_t thread_mix = fnv_reduce(mix);
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// update mix accross threads
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shuffle[0].x = __shfl(thread_mix, 0, THREADS_PER_HASH);
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shuffle[0].y = __shfl(thread_mix, 1, THREADS_PER_HASH);
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shuffle[1].x = __shfl(thread_mix, 2, THREADS_PER_HASH);
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shuffle[1].y = __shfl(thread_mix, 3, THREADS_PER_HASH);
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shuffle[2].x = __shfl(thread_mix, 4, THREADS_PER_HASH);
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shuffle[2].y = __shfl(thread_mix, 5, THREADS_PER_HASH);
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shuffle[3].x = __shfl(thread_mix, 6, THREADS_PER_HASH);
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shuffle[3].y = __shfl(thread_mix, 7, THREADS_PER_HASH);
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if (i == thread_id) {
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//move mix into state:
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state[8] = shuffle[0];
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state[9] = shuffle[1];
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state[10] = shuffle[2];
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state[11] = shuffle[3];
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}
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}
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// keccak_256(keccak_512(header..nonce) .. mix);
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return keccak_f1600_final(state);
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}
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