JPH02271412A - Charging circuit also used for measuring number of individual instructions - Google Patents

Abstract

PURPOSE:To eliminate necessity for resetting contents in a memory and to measure the number of individual instructions by providing a flag to execute an instruction for measuring the number of the instructions, comparing an instruction code to be measured with an instruction code and controlling the input of a counter according to the outputs of those codes. CONSTITUTION:When the instruction code is set to an instruction register 20, a memory means 50 is read with this code as an address and the output of the memory means is accumulated and added with the output of a register 82 by using an adder 81 and saved again to the register 82. Since an weighted value corresponding to the register 20 is stored to the means 50 in advance, this value is accumulated and added as charging information. In this method, when it is instructed by an instruction number measuring flag 40 to measure the number of the instructions, the output of an instruction register 10 to be measured is compared with the output of the instruction register 20 by a comparator 30. When those outputs are coincident, the output of a select signal preparation circuit 60 is adjusted and the output of a selector 70 is made '1' When those outputs are noncoincident, the output of the selector 70 is made '0' Thus, by reading the output of the register 82, the time of instruction execution is measured.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electronic computer system, and particularly to a billing circuit that also measures the number of individual instructions.

[Conventional technology]

As a method of charging in electronic computer systems,
Some methods cumulatively add weighted values for each instruction code as billing information. When measuring the number of individual instructions using this type of billing circuit, the memory that stores the weight values should be initially set so that only the billing information (weight value) corresponding to the instruction being measured is set to 1, and the others are set to 0. It was measured by

[Problem to be solved by the invention]

When measuring the number of instructions using a conventional accounting circuit, the contents of the memory must be reset every time the instruction to be measured is changed, and when measuring the number of executions of several instructions in succession, The disadvantage is that it is less efficient.

[Means to solve the problem]

The billing circuit that also measures the number of individual instructions of the present invention cumulatively adds a weighted value corresponding to the instruction code as billing information. a memory means, an instruction count measurement flag for instructing instruction count measurement, a measured instruction register for holding a measured instruction code, a comparator for comparing the instruction code with the measured instruction code, and the instruction count measurement. a selection signal creation circuit that creates a selection signal in response to a flag and the output of the comparator; and a selector that selects the output of the memory means and a predetermined value in response to the output of the selection signal creation circuit. , and a counter that accumulates the outputs of the selector.

〔Example〕

The present invention will be described in detail below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, and shows only the portions of the billing circuit that are related to the present invention.

In FIG. 1, 10 is a measured instruction register (CIR);
20 is an instruction register (IR), 30 is a comparator between the instruction register under measurement (CIR) 10 and the instruction register (IR>20), 40 is an instruction count measurement flag (CF), 50 is a memory means for decoding (IR), 60 is a selector that selects the memory means 50 and a predetermined value according to the output of the comparator 30 and the output of the instruction count measurement flag (CF) 40;
80 is a counter that accumulates the output of the selector 70, 81 is an adder (WIC), 82 is a register (WIC), and a register (WICR) that holds the output of 81 is a register (WIC).
This is a control circuit that controls the output of ICR) 82.

Next, the operation of this billing circuit will be explained.

Now, when an instruction code is set in the instruction register (IR) 20, the memory means 50 uses the instruction code as an address.
The output is cumulatively added to the output of the register (WICR) 82 by an adder (WIC>81) and saved in the register (WICR) 82 again. A weighted value is stored in advance, and this value can be cumulatively added as billing information.

In the present invention, when there is an instruction to measure the number of instructions using the instruction count measurement flag (CF) 40, the measured instruction register (CIR) 1
0 and the output of the instruction register (IR) 20 are compared by the comparator 30, and if they match, the selection signal generation circuit 6
The output of 0 is adjusted so that the output of selector 70 is ``1''. If they do not match, the output of the selection signal generation circuit 60 is adjusted so that the output of the selector 70 becomes ii On. After that, the output of the selector 70 is added to the adder (WIC).
) 81, added to the output of register (WICR) 82, and saved in register (WICR) 82 again. As a result of this operation, the number of executions of the instruction of the instruction code specified by the instruction under test register (CIR) 10 is accumulated in the register (WICR) 82. That is, the register (WIC
By reading the output of R) 82, the number of instruction executions can be measured.

〔Effect of the invention〕

As explained above, the present invention provides a flag that instructs the measurement of the number of instructions, compares the instruction code to be measured with the instruction code, and controls the input of the counter using the output, thereby resetting the contents of the memory. This has the effect of being able to measure the number of individual instructions without having to do so. Furthermore, if the instruction code to be measured can be set by software, the instructions to be measured can be dynamically changed under software control, which has the effect of efficiently executing the measurement of the number of instructions.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. 10... Instruction under test register (CIR), 20. ,. Instruction register (IR), 30... Comparator, 40...
Instruction count measurement flag (CF), 50...Memory means, 6
0... Selection signal generation circuit, 70... Selector, 80
...Counter, 81...Adder (WIC), 82.
...Shijista (WICR)

Claims (1)

[Claims] A billing circuit that cumulatively adds weighted values corresponding to instruction codes as billing information includes an instruction register that holds the instruction code, a memory means that decodes the instruction code, and an instruction count measurement flag that instructs to measure the number of instructions. and a measured instruction register that holds a measured instruction code.
a comparator that compares the instruction code and the instruction code under test; a selection signal creation circuit that creates a selection signal according to the instruction count measurement flag and the output of the comparator; and an output of the selection signal creation circuit. 1. A billing circuit that also measures the number of individual instructions, characterized in that it comprises a selector that selects the output of the memory means and a predetermined value in response to the above, and a counter that accumulates the output of the selector.