JPS62120541A - Instruction control system - Google Patents

Abstract

PURPOSE:To reduce a program scale and also to simplify an instruction control by designating the execution and the function in different fields and therefore reducing greatly the program size. CONSTITUTION:An instruction 10 to be controlled consists of the 1st and 2nd fields 11 and 13 which are independent of each other. Then the designation of execution carried out in the field 11 is decoded by the 1st decoding means 21. While the designation of function is carried out in the field 13 against the execution designation of the field 11. This function designation is decoded by the 2nd decoding means 23. Furthermore a memory means 30 holds the output of the means 23 until the function is designated again in the field 13. Thus the program size is greatly reduced. This attains the reduction of the program scale as well as the simplified control of the instruction.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a command control system, and particularly to a command control system in which control is performed based on commands consisting of a plurality of independent fields.

2. Description of the Related Art In general, as the scale of an arithmetic processing device increases, it comes to have a variety of functions. As a result, in an instruction control method in which one instruction is assigned to one function, the number of types of instructions increases too much, so it is desired to realize a simpler instruction control method. In response to this, there has conventionally been an instruction execution method in which a detailed specification of a function to be executed in response to one first instruction is performed in a separate second instruction.

In this conventional method, the function is designated by the second command before the execution of the desired function is designated by the first command. On the other hand, the function designation made by the second command remains valid until a new function designation is made by the next second command.

By doing so, more functions are realized with fewer types of instructions, resulting in a simpler instruction control system.

Problems to be Solved by the Invention However, in such conventional command control systems, the function specification of the first command is not specified by the second command.
Because this is done before executing an instruction, for example, if different functions corresponding to the first instruction are to be executed consecutively, the function must be specified using the second instruction each time the first instruction is executed.

Therefore, there were problems in that the program became long and the processing efficiency decreased.

The present invention has been made in view of these points,
The purpose is to provide a simple instruction control method that reduces program size and improves processing efficiency.

Means for resolving problems In the command control system of the present invention, the first
An execution specifying means performed by a field, a first decoding means corresponding to the execution specifying means, and a second decoding means constituting an instruction.
It includes a function specifying means performed by a field, a second decoding means corresponding to the function specifying means, and a storage means for storing the output of the second decoding means.

In the present invention, detailed function specification for the execution specification in the first field is performed by the function specification means using the second field, and this function specification is decoded by the second decoding means.

The output obtained by the decoding is stored by the storage means and held until the function is designated again by the second field.

The present invention will be described in detail by way of examples with reference to the drawings.

FIG. 1 shows one embodiment of the invention. Here, the command 10 to be controlled consists of two different fields, namely a first field 11 and a second field 13 independent of this. The execution designation made in the first field 11 is decoded by the first decoding means 21. Further, the second field 13 specifies a detailed function in response to the execution specification specified by the first field, and is decoded by the second decoding means 23. Storage means 30
is for holding the output of the second decoding means 23 until the function designation is made again in the second field 13.

FIG. 2(a) is an example of a program executed in the embodiment of the present invention. Further, FIG. 6 (6) is an example of a conventional program that performs the same operation content, and is included for comparison and explanation.

Here, the functions specified by program execution are simply indicated as A and B. Therefore, the meaning of each program execution command is as follows.

In FIG. 2(a), the left side of each instruction corresponds to the first field 11, and the right side corresponds to the second field 13.

OP: Execution designation of the first decoding means 21 NOP:
・5ETA does not specify any execution. 5ETB specifies the operation content of the first deciphering means 21 as function A. Also, the conventional example shown in FIG. 2(b) The meaning and contents of the commands are the same even if they are both.

The operations are performed in the order of the programs in this embodiment.

(i) First, in the second field 13 of the instruction IO, "
Specify "Function A". The second field 13 designated in this manner is decoded by the second decoding means 23.

The function A output obtained by the decoding is stored and held in the storage means 30.

(ii) Next, in the first field 11 of the instruction, “
The specified contents of the first field 11 are decoded by the first decoding means 21.

As mentioned above in (i), since the contents of the function A that has already been specified are held in the storage means 30, the first decoding means 2
“Function A” will be executed according to the decoding result “Execution” of No. 1.

(iii) If it is desired to continue the execution of "function A", "execution" is specified in the first field of instruction 10. Since the previous "function A" is still held in the storage means 30, there is no need to designate the function anew. No. 1,
Since there is no designation in the 2 field 13, the storage contents of the storage means 30 do not change. When in that state, the first decoding means 21 of “execution” is newly specified in the first field 11.
``Function A'' is executed again in response to the decoded output.

(iv) By the way, if you want to execute "Function B", specify "Function B" in the second field 13 of the instruction 10. Thereafter, the "execution" designation is made in the first field 11.

Similar to (i) and (ii) above, "Function B" in the second field 13 is decoded by the second decoding means 23 and newly stored in the storage means 30. Further, "execute" in the first field 11 is decoded by the first decoding means 21, and "function B" is executed.

Next, a method for obtaining the program shown in FIG. 2(a) will be described. Here, it is assumed that the function designation in each instruction is valid for subsequent execution designations, as is naturally assumed in general hardware. Under such an assumption, consider a case where function A and function B are executed alternately and consecutively.

In that case, first specify the function as A in the second field 13. In the next instruction 10, "execution" is designated in its first field 11. At the same time, the second instruction lO
In field 13, the function is designated as B. By repeating such a designation operation, a desired program as shown in FIG. 2(a) can be secured.

This will be compared with the conventional program shown in FIG. 2(b).

First, specify the function as A, and then "execute" it with the next command.
Specify. Furthermore, the next command immediately specifies the function, and the next command specifies "execution" again. By repeating this process, the desired program is obtained.

As described above, it can be seen that in the embodiment of the present invention, the program can be significantly shortened compared to the conventional example.

1Vp Arbitrary] As described in detail above, according to the present invention, the program size can be significantly reduced by specifying execution and specifying functions in different fields. In particular, the reduction in program size is remarkable when, for example, two functions are specified to be executed alternately and consecutively. In this way, the program scale is reduced and instruction control is simplified, which is extremely effective in practical use.

[Brief explanation of drawings]

FIG. 1 is an explanatory block diagram of an instruction control system according to an embodiment of the present invention. FIGS. 2(a) and 2(c) are explanatory diagrams showing examples of control programs in the embodiment of the present invention and the conventional example. (main reference number)

Claims (1)

[Claims] Using an instruction having at least different first and second fields, the first field specifies execution, and the second field specifies detailed functions for the execution specification; The function specified in the second field will be changed to the new function specified in the second field.
An instruction control system characterized in that the command control method is configured to be maintained until it is performed in the field, and the function is configured to perform an execution operation in accordance with the specified execution.