X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=src%2Fnnue%2Flayers%2Faffine_transform.h;h=0e0515f932a0773cc82f72c1620bc0a1afe5e5eb;hb=c7f0a768cb9d5972861baae0f215d69f9e86a626;hp=caf315b2792897df8b206c57aa718cb8331ec496;hpb=8630d03dd4e1ec7e492ddf6c40d9d9e4cdba2a58;p=stockfish

diff --git a/src/nnue/layers/affine_transform.h b/src/nnue/layers/affine_transform.h
index caf315b2..0e0515f9 100644
--- a/src/nnue/layers/affine_transform.h
+++ b/src/nnue/layers/affine_transform.h
@@ -680,9 +680,8 @@ namespace Eval::NNUE::Layers {
         for (IndexType j = 0; j < kNumChunks; ++j) {
           __m128i row_j = _mm_load_si128(&row[j]);
           __m128i input_j = _mm_load_si128(&input_vector[j]);
-          __m128i row_signs = _mm_cmpgt_epi8(kZeros, row_j);
-          __m128i extended_row_lo = _mm_unpacklo_epi8(row_j, row_signs);
-          __m128i extended_row_hi = _mm_unpackhi_epi8(row_j, row_signs);
+          __m128i extended_row_lo = _mm_srai_epi16(_mm_unpacklo_epi8(row_j, row_j), 8);
+          __m128i extended_row_hi = _mm_srai_epi16(_mm_unpackhi_epi8(row_j, row_j), 8);
           __m128i extended_input_lo = _mm_unpacklo_epi8(input_j, kZeros);
           __m128i extended_input_hi = _mm_unpackhi_epi8(input_j, kZeros);
           __m128i product_lo = _mm_madd_epi16(extended_row_lo, extended_input_lo);
@@ -704,9 +703,8 @@ namespace Eval::NNUE::Layers {
         for (IndexType j = 0; j < kNumChunks; ++j) {
           __m64 row_j = row[j];
           __m64 input_j = input_vector[j];
-          __m64 row_signs = _mm_cmpgt_pi8(kZeros, row_j);
-          __m64 extended_row_lo = _mm_unpacklo_pi8(row_j, row_signs);
-          __m64 extended_row_hi = _mm_unpackhi_pi8(row_j, row_signs);
+          __m64 extended_row_lo = _mm_srai_pi16(_mm_unpacklo_pi8(row_j, row_j), 8);
+          __m64 extended_row_hi = _mm_srai_pi16(_mm_unpackhi_pi8(row_j, row_j), 8);
           __m64 extended_input_lo = _mm_unpacklo_pi8(input_j, kZeros);
           __m64 extended_input_hi = _mm_unpackhi_pi8(input_j, kZeros);
           __m64 product_lo = _mm_madd_pi16(extended_row_lo, extended_input_lo);