1 files changed, 4 insertions, 5 deletions

diff --git a/src/arch/avx2.h b/src/arch/avx2.h
index cb9c0cd..74aad53 100644
--- a/src/arch/avx2.h
+++ b/src/arch/avx2.h
@@ -430,13 +430,12 @@ invcoord_epe(uint64_t i)
 STATIC_INLINE bool
 is_eo_even(cube_t cube)
 {
-        uint8_t count;
+        uint32_t mask;
         __m256i e;
 
         e = _mm256_and_si256(cube, EO_AVX2);
-        e = _mm256_srli_si256(e, EOSHIFT);
+        e = _mm256_slli_epi16(e, 7-EOSHIFT);
+        mask = _mm256_movemask_epi8(e);
 
-        count = _mm256_reduce_add_epi8(e);
-
-        return count % 2 == 0;
+        return popcount_u32(mask) % 2;
 }