Support for the CPU code names in -march is a simple but really useful change: -march=nehalem, westmere, sandybridge, ivybridge, haswell, bonnell, broadw

Support for the CPU code names in -march is a simple but really useful change: -march=nehalem, westmere, sandybridge, ivybridge, haswell, bonnell, broadwell, silvermont Also this: -mtune=intel can now be used to generate code running well on the most current Intel processors, which are Haswell and Silvermont for GCC 4.9.