JPS6279519A - General-use register reading method - Google Patents

Abstract

PURPOSE:To improve a processing speed at reading data by outputting simultaneously the data of a continuous general-use register to the high-order and the low-order of a bus besides the data of a single general-use register. CONSTITUTION:When the data of a single general-use register 2 are read to a bus master part 4a, a register file 3a designated by the signal outputted from a general-use register controller 1 and the data read from a register file 3b are selected by a selector 6a and outputted to the bus master part 4a. When the data of a continuous general-use register 2 are read to the bus master part 4a and a bus slave part 4b, by the signal outputted from the general-use register controller 1, the data read from the register file 3a and the register file 3b by the selector 6a are selected by the selector 6a, and outputted to the bus master part 4a. Further, the next data are selected by a selector 6b and outputted to the bus slave part 4b. Thus, the processing speed can be made fast and the control sequence of the general-use register comes to be also simple.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for reading general-purpose registers when executing instructions in an electronic computer.

[Conventional technology]

Figure 2 is for explaining the conventional general-purpose register reading method. In Figure 1, (1) is a general-purpose register controller for selecting a general-purpose register to read, (2) is a general-purpose register, and (3) is a general-purpose register controller. A register file (4a) that stores a group of general-purpose registers.

(4b) is a demultiplexer that distributes the output of the register file (3) to the upper 5 (4a) and lower 5 (4b) parts of the bus, respectively.

Next, the operation will be explained. Single general purpose register (2)
When reading the data to the upper part of the bus (4a).

The data of the general-purpose register (2) in the register file (3) specified by the signal output from the general-purpose register controller (1) is outputted to the upper bus section (4a) by the demultiplexer (5). Next, data in consecutive general-purpose registers (2) is transferred to the upper part (4a) and lower part (4b) of the bus.
), the data in the first general-purpose register (2) is first read out to the upper bus section (4a) in exactly the same manner as described above. Then the general purpose register controller (1)
outputs a signal that selects the general-purpose register (2) following it. The data in the general-purpose register (2) in the register file (3) specified by this signal is transferred to the demultiplexer (5).
) is output to the lower bus section (4b).

[Problem that the invention seeks to solve]

The conventional general-purpose register reading method is as described above, so when outputting the data of consecutive general-purpose registers to the upper and lower parts of the bus, two steps must be taken, and the data of a single general-purpose register must be read. There are problems in that the processing speed is slower than when reading data, and the general-purpose register controller must also have a function to control two steps.

This invention was made to solve the above-mentioned problems, and improves the processing speed when reading data from consecutive general-purpose registers.

The purpose is to simplify the functional sequence of the general-purpose register controller.

[Failure to solve the problem]

A general-purpose register reading method according to the present invention.

The register file that stores general-purpose registers is separated into a file for even-numbered general-purpose registers and a file for odd-numbered general-purpose registers, and selectors that can select the output of both are provided in the upper and lower parts of the bus. It has a configuration that allows register data to be output to the upper and lower sides of the bus at the same time.

[Effect]

In the general-purpose register reading method according to the present invention, by simultaneously outputting the data of consecutive general-purpose registers to the upper and lower parts of the bus, it is possible to execute operations at the same processing speed as when reading data from a single general-purpose register. The control sequence of the general-purpose register controller also requires only one step.

[Embodiment J Hereinafter, one embodiment of the present invention will be described with reference to the drawings. 1st
In the figure, 0) is a general-purpose register controller for selecting a general-purpose register to read.

(2) is a general-purpose register, (3a) is a register file that stores a group of even-numbered general-purpose registers, (5b)
(c) A register file that stores odd-numbered general-purpose register groups; (4a) and (4b) are the bus upper part and bus lower part, respectively; (6a) is the register controller (11) to store the even-odd general-purpose register (2) selected by・
Depending on odd and even.

A selector for selecting data read from the register file (3a) and data read from the register file (6b), (6b) is a register controller (1
) is a selector that selects and reads the next general-purpose register selected by the register file (3a) or the register file (3b).

The data of a single general-purpose register (2) is transferred to the upper part of the bus (4a
) is the same as the conventional general-purpose register reading method, and the data read from the register file (3a) and register file (6b) specified by the signal output from the general-purpose register controller (1) is It is selected by the selector (6a) and output to the upper bus section (4a). Also, when reading data from consecutive general-purpose registers (2) to the upper bus section (4a) and the lower bus section (4b),
Data read from the register file (6a) and register file (6b) is selected by the selector (6a) according to a signal output from the general-purpose register controller (11), and output to the upper bus section (4a).

Furthermore, the next data is selected by the selector (6b) and output to the lower part of the bus (4b).

Also, separate the general-purpose register (2) with a remainder of 3.

By using a 3-register file and providing 3 selectors, it is possible to read 3 consecutive general-purpose registers.

In addition, by providing a block with the function of masking data before or after the selector, and by overlapping the outputs of two or three selectors by the masked bits, only the necessary data can be concatenated. It is also possible to output data simultaneously to the bus, which is effective in improving processing speed when calculating discontinuous data.

[Effect of the Invention J As described above, the general-purpose register reading method according to the present invention has the advantage of increasing the processing speed and simplifying the general-purpose register control sequence.

[Brief explanation of drawings]

FIG. 1 is a diagram for explaining a general-purpose register reading method according to an embodiment of the present invention, and FIG. 2 is a diagram for explaining a conventional general-purpose register reading method. In the figure, (1) is a general-purpose register controller, (2) is a general-purpose register, (3) is a register file, (41i1
bus. (5) is a demultiplexer, and (6) is a selector. In FIG. 1, the same or corresponding parts are designated by the same reference numerals.

Claims (1)

[Claims] In the method for reading general-purpose registers of electronic computers, a register file storing general-purpose registers is separated into a file for even-numbered general-purpose registers and a file for odd-numbered general-purpose registers, and data in even-numbered general-purpose registers and data in odd-numbered general-purpose registers are separated. Selectors that can select both data are provided on the upper and lower sides of the bus, respectively.
A general-purpose register reading method characterized by outputting not only the data of a single general-purpose register but also the data of successive general-purpose registers to the upper and lower ends of a bus.