The original AVX brought 256-bit floating-point SIMD instructions, the AVX2 allows to operate with the AVX 256-bit wide YMM register for integer data types. The problem with current AMD hardware is that the Bulldozer FPU only supports 128-bit integer operations used in the XOP instruction set, reports HardwareLuxx web-site.
To support AVX2 instructions, AMD will need to either considerably upgrade its FPU [floating point unit], which is shared between two ALUs in a Bulldozer module, or even develop a new one from scratch. The new one will expectedly feature dramatic performance improvements, but even a redesigned one should be noticeably faster than existing one in numerous demanding applications that process loads of data.
AMD Excavator promises big performance gains
Posted on Tuesday, October 22 2013 @ 11:39 CEST by Thomas De Maesschalck