gpr_read_address
gva += gpr_read_address(instr, state, sib->bas->num);
reg = gpr_read_address(instr, state, sib->idx->num);
gva = gpr_read_address(instr, state, store->u.reg->num);
gva = gpr_read_address(instr, state, store->u.dualreg.reg1) +
gpr_read_address(instr, state, store->u.dualreg.reg2);