Data to copy to export buffers. This is an optional operand. Must be specified as off if not used.
The compr modifier indicates the use of compressed (16-bit) data, thus decreasing the number of source operands from 4 to 2:
src0 and src1 must specify the first register (or off).
src2 and src3 must specify the second register (or off).
exp mrtz v3, v3, off, off compr
Size: 1 dword.