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Merged
kevlu8 merged 3 commits into from
Apr 10, 2026
Merged

Pairwise #303

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7dcda45
pairwise initial
kevlu8 Apr 8, 2026
5d5855c
vectorize
wdotmathree Apr 8, 2026
79c2499
Fix pawnvalue command
wdotmathree Apr 9, 2026
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1 change: 1 addition & 0 deletions engine/main.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -413,6 +413,7 @@ __attribute__((weak)) int main(int argc, char *argv[]) {
for (int i = 0; i < 8; i++) {
pos.reset_startpos();
pos.mailbox[SQ_A2 + i] = NO_PIECE;
am.refresh_finny(pos, am.idx);
Value score = eval(pos, am);
int diff = startpos_score - score;
tot += diff;
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32 changes: 19 additions & 13 deletions engine/nnue/network.cpp
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Expand Up @@ -34,24 +34,30 @@ int32_t nnue_eval(const Network &net, const Accumulator &stm, const Accumulator
const __m256i zero = _mm256_setzero_si256();
const __m256i qa_vec = _mm256_set1_epi16(QA);

for (int i = 0; i < HL_SIZE; i += 16) {
__m256i stm_vals = _mm256_loadu_si256((__m256i*)&stm.val[i]);
__m256i ntm_vals = _mm256_loadu_si256((__m256i*)&ntm.val[i]);
for (int i = 0; i < HL_SIZE / 2; i += 16) {
__m256i stm_vals1 = _mm256_loadu_si256((__m256i *)&stm.val[i]);
__m256i stm_vals2 = _mm256_loadu_si256((__m256i *)&stm.val[i + HL_SIZE / 2]);
__m256i ntm_vals1 = _mm256_loadu_si256((__m256i *)&ntm.val[i]);
__m256i ntm_vals2 = _mm256_loadu_si256((__m256i *)&ntm.val[i + HL_SIZE / 2]);

stm_vals = _mm256_max_epi16(stm_vals, zero);
stm_vals = _mm256_min_epi16(stm_vals, qa_vec);
stm_vals1 = _mm256_max_epi16(stm_vals1, zero);
stm_vals1 = _mm256_min_epi16(stm_vals1, qa_vec);
stm_vals2 = _mm256_max_epi16(stm_vals2, zero);
stm_vals2 = _mm256_min_epi16(stm_vals2, qa_vec);

ntm_vals = _mm256_max_epi16(ntm_vals, zero);
ntm_vals = _mm256_min_epi16(ntm_vals, qa_vec);
ntm_vals1 = _mm256_max_epi16(ntm_vals1, zero);
ntm_vals1 = _mm256_min_epi16(ntm_vals1, qa_vec);
ntm_vals2 = _mm256_max_epi16(ntm_vals2, zero);
ntm_vals2 = _mm256_min_epi16(ntm_vals2, qa_vec);

__m256i stm_weights = _mm256_loadu_si256((__m256i*)&net.output_weights[nbucket][i]);
__m256i ntm_weights = _mm256_loadu_si256((__m256i*)&net.output_weights[nbucket][HL_SIZE + i]);
__m256i stm_weights = _mm256_loadu_si256((__m256i *)&net.output_weights[nbucket][i]);
__m256i ntm_weights = _mm256_loadu_si256((__m256i *)&net.output_weights[nbucket][i + HL_SIZE / 2]);

__m256i stm_prod = _mm256_mullo_epi16(stm_vals, stm_weights);
__m256i ntm_prod = _mm256_mullo_epi16(ntm_vals, ntm_weights);
__m256i stm_prod = _mm256_mullo_epi16(stm_vals1, stm_weights);
__m256i ntm_prod = _mm256_mullo_epi16(ntm_vals1, ntm_weights);

__m256i stm_res = _mm256_madd_epi16(stm_prod, stm_vals);
__m256i ntm_res = _mm256_madd_epi16(ntm_prod, ntm_vals);
__m256i stm_res = _mm256_madd_epi16(stm_prod, stm_vals2);
__m256i ntm_res = _mm256_madd_epi16(ntm_prod, ntm_vals2);

sum = _mm256_add_epi32(sum, stm_res);
sum = _mm256_add_epi32(sum, ntm_res);
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2 changes: 1 addition & 1 deletion engine/nnue/network.hpp
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Expand Up @@ -28,7 +28,7 @@ struct Accumulator {
struct Network {
int16_t accumulator_weights[INPUT_SIZE * NINPUTS][HL_SIZE];
int16_t accumulator_biases[HL_SIZE];
int16_t output_weights[NBUCKETS][2 * HL_SIZE];
int16_t output_weights[NBUCKETS][HL_SIZE];
int16_t output_bias[NBUCKETS];

void load();
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