AVX Instruction Set

AVX — An Instroduction

The AVX instruction set was announced by Intel in March of 2008. It departs from Intel's usual instruction encoding form in that it allows 3-operand instructions. It's also intended to address growing register sized in the future, as SIMD widths increase. Initially, plans are for 16 256-bit registers, but it also extends to 512-bit registers with AVX-512. Whereas SSE registers are called XMM0-XMM7, AVX's registers are called YMM0-YMM15. The XMM registers map to the bottom half of each of the larger YMM registers.

Instructions

AVX repurposes many SSE instructions, and also adds the following:

VBROADCAST[S|D|F128] - Copies a 32-128 bit operand to all fields of a register.
VINSERTF128 - Replaces the top or bottom half of a YMM register
VEXTRACT128 - Copies the top or bottom half of a YMM register
VMASKMOVP[S|D] - Conditional move
VPERMILP[S|D] - "In-Lane" shuffle (can't shuffle across 128-bit boundaries).
VPERM2F128 - Shuffles 2 sources into a single destination.
VZEROALL - Sets all YMM registers to zero.
VZEROUPPER - Clears the top half of all YMM registers.
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