JPS63163563A - Data processor - Google Patents

Abstract

PURPOSE:To improve the performance of a central processing unit by providing general registers and validation bits corresponding to these registers in the central processing unit and a scientific arithmetic processing unit. CONSTITUTION:A central processing unit 2 and a scientific arithmetic processing unit 3 are provided with plural general registers 10 and 12 used by machine language instructions and validation bits 11 and 13 corresponding to these registers. Validation bits corresponding to general registers used in the central processing unit 2 are turned on, and contents of used general-purpose registers GR(0)-GR(15) are transferred to general-purpose registers of the scientific arithmetic processing unit 3 and validation bits V(0)-V(15) corresponding to pertinent general-purpose registers in the central processing unit 2 are turned off. Validation bits U(0)-U(15) corresponding to general registers, to which contents of said registers are transferred, of the scientific arithmetic processing unit 3 are turned on, and results of scientific operation arithmetic processing based on contents of general-purpose registers XRG(0)-XRG(15) of the scientific arithmetic processing unit 3 are stored in general-purpose registers 12 of the scientific arithmetic processing unit 3. Thus, the processing is quickly performed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a system for controlling general-purpose registers in a data processing device equipped with a scientific processing unit (SIP).

(Prior Art) Conventionally, this type of data processing device has a general-purpose register (OR
) There are 16 registers in the central processing unit, and even if the scientific calculation processing unit is connected, after the scientific calculation is completed, the result of the calculation is stored in the general-purpose register, so the data is transferred from the scientific calculation processing unit. All calculation result data was transferred to the central processing unit.

Among the general-purpose registers, registers used for address calculations, scientific operations, branch destination addresses, etc. differ depending on the software structure.

(Problem to be solved by the invention) Therefore, in order to prevent the above calculation results from being transferred to the central processing unit, duplication of general-purpose registers can be considered.
A problem arises in that it is unclear which general-purpose register out of the total number of general-purpose registers can be made resident.

SUMMARY OF THE INVENTION An object of the present invention is to provide a data processing device that can speed up processing by omitting the operation of transferring scientific calculation results from a scientific calculation processing device to a central processing unit.

(Means for Solving the Problems) In order to achieve the above object, a data processing device according to the present invention includes a central processing unit that processes machine language instructions, and a scientific operation processor that executes scientific operations according to instructions from the central processing unit. In the data processing device, each of the central processing unit and the scientific processing unit is equipped with a plurality of general-purpose registers used in machine language instructions and all valid bits corresponding to each of the general-purpose registers, and Turn on the valid bit corresponding to the general-purpose register used in the electronics manufacturing,
The content of the general-purpose register being used is transferred to the general-purpose register of the scientific processing unit, and the valid bit corresponding to the general-purpose register of the central processing unit is turned off, and the valid bit of the scientific processing unit corresponding to the general-purpose register that has been transferred is turned off. is turned on, and the result of scientific calculation processing based on the contents of the general-purpose register of the scientific calculation processing device is stored in the general-purpose register of the scientific calculation processing device.

(Example) Hereinafter, the present invention will be explained in more detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a data processing apparatus according to the present invention.

In the figure, a main memory device (MEM) 1 and a central processing unit (CPU) z are connected by a memory bus 100. The central processing unit 2 and the scientific operation processing bag@(8IP) 3 are connected by a data bus 101.

The central processing unit 2 has general-purpose registers G(0) to GR(15).
) is equipped with 16 registers.

Valid bins) V(o
) to V (15).

On the other hand, the scientific processing unit 3 also has 16 general-purpose registers XGR(o) to XGJ15) corresponding to the central processing unit 2.
As in the case of the central processing unit, these registers 12Q are provided with general-purpose registers XGR(0) to X
Corresponding to GR (15), each valid pitch) V (0
) to V(xs) are provided.

In the initial state, the valid bits v(0) to
V(1s) is turned on, and the valid bits V(O) to v(15) of the scientific processing unit 3 are turned off.

Next, a case will be described in which a machine language instruction is executed to perform a scientific operation on the operand data of the general-purpose register GR(3) and the main memory [1, and write the result of the operation to the general-purpose register GR(3).

When a machine language instruction is interpreted, according to the operand address,
Operand data is taken into the central processing unit 2 from the main storage device l.

The central processing unit 2 transfers the scientific operation code and operand data to the scientific operation processing unit 3.

Next, the valid bit (3) of the general-purpose register 0R (3) is turned off and the data of the general-purpose register GR (3) is sent through the data bus 101.

The scientific operation processing device 3 starts the scientific operation when the operation code of the scientific operation, the operand data, and the data in the general-purpose register GR(a) are completed.

Upon completion of the scientific operation, the scientific operation processing device 3 stores the operation result in the general-purpose register XGR(3) within the scientific operation device 3, and at the same time turns on the valid bin (V(a)).

(Effects of the Invention) As described above, the present invention provides general-purpose registers and corresponding valid bits in the central processing unit and the scientific processing unit, respectively, so that in the case of machine language instructions that store operation results in general-purpose registers, etc. Since there is no need to transfer calculation results from the scientific processing unit to the central processing unit, the performance of the central processing unit can be improved.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a data processing apparatus according to the present invention. 1... Main memory device 2... Central processing unit 3...
・Scientific processing unit 10.12-16 general-purpose registers 11.13-・Effective bits corresponding to general-purpose registers Patent applicant NEC Corporation Representative Patent attorney Hisao Inoro Im

Claims (1)

[Claims] A data processing device comprising a central processing unit that processes machine language instructions and a scientific calculation processing unit that executes scientific calculations according to instructions from the central processing unit, the central processing unit and the scientific calculation processing unit Each is equipped with a plurality of general-purpose registers used in machine language instructions and a valid bit corresponding to each of the general-purpose registers, and turns on the valid bit corresponding to the general-purpose register used in the central processing unit. transfers the contents of the general-purpose register to the general-purpose register of the scientific processing unit, turns off the valid bit corresponding to the general-purpose register of the central processing unit, turns on the valid bit of the scientific calculation processing unit corresponding to the transferred general-purpose register, A data processing device characterized in that a result of scientific calculation processing based on the contents of a general-purpose register of the scientific calculation processing device is stored in a general-purpose register of the scientific calculation processing device.