immintrin_dbg.h is an include file, a wrapper around immintrin.h. It implements most of AVX, AVX2, AVX-512 vector intrinsics to enable source level debug. Usage: just include immintrin_dbg.h in debug build only. All functions are automatically generated from the intrinsics guide: https://software.intel.com/sites/landingpage/IntrinsicsGuide/ $ icc -O -g -xAVX $ gcc -Og -std=c99 -g -lm -Wno-psabi -march=nehalem -Wno-incompatible-pointer-types $ clang -O1 -g -march=nehalem -lm Please note, that GCC and clang will compile using SSE registers only, so this will work on any x86 CPU but Quark. ICC may still use ZMM0 register to return _m512 type from functions. If compiled with -O3, it will vectorize the debug library which would make debugging harder. Known bugs: _range_pd _reduce_pd rsqrt accuracy rsqrt14 accuracy assume -ffast-math won't compile with high warnings levels