Debug AVX2 sum function

Author: nicodr97

.github/workflows/build.yml

@@ -24,7 +24,7 @@ jobs:
     runs-on: ubuntu-20.04
     strategy:
       matrix:
-        arch: [x86]
+        arch: [x86, x86_64]
         cpu_instr: [non-SIMD, SSE2, AVX2, NEON, auto-selected]
 
     steps:

source/Platform/x86/AVX2.cpp

@@ -106,12 +106,16 @@ class AVX2Vector {
   inline uint16_t sum() const {
     __m256i sum256 = _mm256_sad_epu8(vector, _mm256_setzero_si256());
     __m128i sum128 = _mm_add_epi64(_mm256_extractf128_si256(sum256, 1), _mm256_castsi256_si128(sum256));
+    uint16_t res = _mm_extract_epi64(sum128, 0) + _mm_extract_epi64(sum128, 1);
+    std::cout << "uint16_t res = " << res << "\n";
     return _mm_extract_epi64(sum128, 0) + _mm_extract_epi64(sum128, 1);
   }
 #else
   inline uint16_t sum() const {
     __m256i sum256 = _mm256_sad_epu8(vector, _mm256_setzero_si256());
     __m128i sum128 = _mm_add_epi64(_mm256_extractf128_si256(sum256, 1), _mm256_castsi256_si128(sum256));
+    uint16_t res = _mm_extract_epi32(sum128, 0) + _mm_extract_epi32(sum128, 1);
+    std::cout << "uint16_t res = " << res << "\n";
     return _mm_extract_epi32(sum128, 0) + _mm_extract_epi32(sum128, 2);
   }
 #endif