title: GNU Fortran compiler optimisation flags for Ivy Bridge architecture
body: <p>May I please ask for your suggestions on the GNU Fortran compiler (v6.3.0) flags to optimise the code for the Ivy Bridge architecture (Intel Xeon CPU E5-2697v2 Ivy Bridge @ 2.7 GHz)?</p>
  
  <p>At the moment I’m compiling the code with the following flags:</p>
  
  <pre><code>-O3 -march=ivybridge -mtune=ivybridge -ffast-math -mavx -m64 -w
  </code></pre>