SSE5

Streaming SIMD Extensions version 5 (SSE5),

was a x86-64 SIMD instruction set extension proposed by AMD in 2007, with a bunch of very interesting instructions for high performance bitboarding and evaluation. However, after Intel declared their 256-bit wide Advanced Vector Extensions (AVX) as further SIMD extension, AMD reconsidered and replaced SSE5 with three smaller instruction set extensions XOP for vectors of integers, FMA4 ( fused multiply-add on vectors of float and double), and CVT16 ( Half precision floating-point format), which retain the proposed functionality of SSE5, but encode the instructions differently for better compatibility with Intel’s proposed AVX instruction set and the new VEX prefix coding scheme. The sets are stated for introduction in AMD’s new Bulldozer processor core, due for release in late 2011 on a 32nm process [1] .