Chapter 8.4 : The vectorization of reduction with intrinsic functions

• 8.4.1) The reduction_intrinsics.h file
• 8.4.2) The reduction_intrinsics.cpp file
• 8.4.3) The main_intrinsics.cpp
• 8.4.4) The CMakeLists.txt file
• 8.4.5) The compilation
• 8.4.6) The performances

During this section, we will use :

• Inclusion of file immintrin.h
• Intrinsic function : _mm256_load_ps
• Intrinsic function : _mm256_store_ps
• Intrinsic function : _mm256_storeu_ps (variant of the _mm256_store_ps to store values in unaligned vector)
• Intrinsic function : _mm256_add_ps
• Intrinsic function : _mm256_broadcast_ss (to duplicate a float 8 times in a vectorial register)
• Enable specific optimisations with -O3 -march=native -mtune=native -mavx2