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Change DAG read offsets every iteration to prevent ASIC optimization #13

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Change DAG read offsets every iteration to prevent ASIC optimization #13

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2 changes: 1 addition & 1 deletion README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -332,7 +332,7 @@ void progPowLoop(
// global load to sequential locations
uint32_t data_g[PROGPOW_DAG_LOADS];
for (int i = 0; i < PROGPOW_DAG_LOADS; i++)
data_g[i] = dag[(offset_g*PROGPOW_LANES + l)*PROGPOW_DAG_LOADS + i];
data_g[i] = dag[(offset_g*PROGPOW_LANES + (l + loop) % 16)*PROGPOW_DAG_LOADS + i];

// initialize the seed and mix destination sequence
int mix_seq_dst[PROGPOW_REGS];
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2 changes: 1 addition & 1 deletion libprogpow/ProgPow.cpp
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Expand Up @@ -134,7 +134,7 @@ std::string ProgPow::getKern(uint64_t block_number, kernel_t kern)
ret << "offset = share[group_id];\n";
}
ret << "offset %= PROGPOW_DAG_ELEMENTS;\n";
ret << "offset = offset * PROGPOW_LANES + lane_id;\n";
ret << "offset = offset * PROGPOW_LANES + (lane_id + loop) % 16;\n";
ret << "data_dag = g_dag[offset];\n";
ret << "// hack to prevent compiler from reordering LD and usage\n";
if (kern == KERNEL_CUDA)
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