GCC flag -ftree-vectorize may further utilize Intel x86 SIMDs like SSE and SSE2 to provide further parallelization and floating point performance.
"Vectorization is enabled by the flag -ftree-vectorize and by default at -O3. To allow vectorization on powerpc* platforms also use -maltivec. On i?86 and x86_64 platforms use -msse/-msse2. To enable vectorization of floating point reductions use -ffast-math or -fassociative-math."
GCC flag
-ftree-vectorizemay further utilize Intel x86 SIMDs like SSE and SSE2 to provide further parallelization and floating point performance."Vectorization is enabled by the flag -ftree-vectorize and by default at -O3. To allow vectorization on powerpc* platforms also use -maltivec. On i?86 and x86_64 platforms use -msse/-msse2. To enable vectorization of floating point reductions use -ffast-math or -fassociative-math."
https://gcc.gnu.org/projects/tree-ssa/vectorization.html