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If you were to call this explicitly on our clusters, then the options needed are:

Bellatrix (Intel SandyBridge) 

-xAVX

Which means "May generate Intel(R) Advanced Vector Extensions (Intel(R) AVX), Intel(R) SSE4.2, SSE4.1, SSE3, SSE2, SSE, and SSSE3 instructions for Intel(R) processors.

Castor (Intel IvyBridge)

-xCORE-AVX-I

 Which means "May generate Float-16 conversion instructions and the RDRND instruction, Intel(R) Advanced Vector Extensions (Intel(R) AVX), Intel(R) SSE4.2, SSE4.1, SSE3, SSE2, SSE, and SSSE3 instructions  for  Intel(R)  processors."

 For scientific codes there is little difference in the instructions between that and SandyBridge, so -xAVX works just as well.

Deneb (Intel IvyBridge and Haswell)

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