Stores a 16-byte long value (16 bytes) from a quad vfpu register into unaligned memory.

Usage:

usv.q vd, offset(rm)
{
   *(rm + offset +  0) = vd[0];
   *(rm + offset +  4) = vd[1];
   *(rm + offset +  8) = vd[2];
   *(rm + offset + 12) = vd[3];
}

this is not a real instruction but an alias to output a pair of svl/svr instructions.

rm is a general purpose register holding an unaligned memory address. offset is optional.