You compiled with auto-vectorization disabled; enable auto-vectorization:

• Intel compiler 14.x or below: Increase the optimization level to O2 or O3.
• Microsoft Visual C++* compiler: Increase the optimization level to O2 or O3.
• GNU* gcc compiler, do one of the following:
• Increase the optimization level to O2 or O3.
• Use the ftree-vectorize compiler option