Selects the lower 8 bits (b16), lower 16 bits (b32), or lower 32 bits (b64) of the elements in the source operand and writes them to the lower half or upper half of the destination operand.
asc_pack: Writes the source operand to the lower half of the destination operand.
asc_pack_v2: Writes the source operand to the upper half of the destination operand.
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For details about vector data registers and mask registers, see .
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PIPE_V
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