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VZEROALL

Sets the destination operands to zero. This instruction zeroes all YMM and ZMM registers.

The table after the description covers what the source and destinations can be.

DO NOT support LOCK

This instruction SHALL only be executed in 64-bit mode or compatibility mode. It is not supported in 32-bit mode.

VZEROALL is used to eliminate false dependencies on the upper bits of YMM and ZMM registers. Failure to use VZEROALL or VZEROUPPER when transitioning between AVX and non-AVX code may result in significant performance penalties due to state transitions.