There are several new instructions supported with our “Bulldozer” core which is due out next year. It’s kind of an alphabet soup – SSSE3, SSE4.1, SSE4.2, AES-NI, PCLMULQDQ , AVX, XOP, and FMA4. When you see this list of new instructions, you are probably thinking “well that means I am going to have to change my software.” Well, yes and no.
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Original Source: John Fruehe's blog, Director of Product Marketing for Server, Embedded and FireStream products at AMD.