JPS6247752A - Counter circuit for number of instruction executions of information processor - Google Patents

Abstract

PURPOSE:To count the number of instruction executions with inexpensive hardware by providing a storage field for the number of executions of instruction words and adding the number for each execution of an instruction to store them in the storage field. CONSTITUTION:When an instruction word given from a memory device 3 is set to an instruction register 4, the output of an instruction decoding part 4-1 is turned into the address of a control store 13. This address serves as a start address of a microprogram which processes the instruction word. The output of the store 13 is set to a control register 14 for start of the instruction processing. Then an adder 11 adds addresses one by one and a microprogram is executed continuously. Here the output of a counter part 9-1 receives +1 only from an adder 8 and is written to the same address of the part 9-1. Then the number of executions are counted for each instruction.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a circuit for counting the number of instruction executions in an information processing device, and particularly to a circuit for counting the number of instruction executions in an information processing device that processes instruction words under microprogram control. It concerns a counting circuit.

〔overview〕

The present invention uses a memory that has a microprogram start address field and a field for storing the number of instruction executions, and whose writing can be controlled separately, in an instruction execution count counting path of an information processing device. This allows the number of times an instruction is executed to be measured using low-cost hardware by adding and storing the number of times each instruction is executed in a field that stores the number of times, and reading out the counting result based on instructions from the control device. be.

[Conventional technology]

Measuring the number of times an information processing device executes an instruction in a certain period of time is necessary to evaluate the performance of the information processing device.
It is also necessary to improve programs running on information processing devices.

However, conventionally, counting the number of instruction executions of an information processing device is
A commercially available general-purpose counter is connected to a device, a circuit that detects the execution of a certain command is built into the device, and the number of times that detection signal appears within a certain period of time is counted. It was measured by repeating it many times.

[Problem that the invention seeks to solve]

For this reason, in the conventional measurement method described above, it is time-consuming to attach a general-purpose counter to the outside of the device, and it is also necessary to incorporate a measurement circuit, which makes the device complicated and expensive. Another drawback is that it is not possible to measure the execution frequency of all instructions at once.

SUMMARY OF THE INVENTION An object of the present invention is to provide an instruction execution count counting circuit for an information processing device that can measure the number of instruction executions with a low-cost device and can measure the number of executions of each instruction at once.

[Means for solving problems]

The instruction execution count circuit of the information processing device of the present invention has an instruction register that reads out and holds a microinstruction word divided into an instruction code part and an operand part from a storage device, and corresponds to the instruction code part of this register as an address input. In an instruction execution count circuit for an information processing device, the memory includes a memory for outputting a start address of a microprogram, in addition to a first field for storing a start address of a microprogram corresponding to an instruction code section; It has a second field that stores the number of executions of the instruction word,
Each of them can be written separately, and includes means for adding 1 to a second field of the memory each time a command is executed, and means for instructing initialization of the second field of the memory and executing the command. a control device that instructs to start and end counting the number of times and instructs to read out the counting results;
The present invention is characterized by comprising a control circuit that controls counting of the number of instruction executions and reading of the counting results based on an instruction from the control device and an instruction to start execution of the next new instruction word by the microprogram.

[Effect]

According to an instruction from the control device, the number of times the instruction word is executed is added up and stored in the memory, and the counting result can be read out according to an instruction from the control device.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

The figure is a circuit diagram showing one embodiment of the present invention.

The information processing device 1 includes an instruction register 4, a counter 5, a selector 6, a write data register 7, an adder 8, a pathfinder memory 9 having a counter section and a micro address section, a micro address register 10. Adder 11. Micro address selector 12, control store 13
, a control register 14, and a control circuit 15.

The instruction register 4 includes an instruction code section 4-1 and an operand section 4-2, and stores an instruction word from the memory device 3 via a signal line 102. The counter 5 has functions of resetting and counting and adding the contents one by one. Selector 6 is signal line 10
Select either the instruction code part 4-1 to be input in step 2 or the contents of the counter 5 to be input in signal line 103, and
4 is input to the pathfinder memory 9. The pathfinder memory 9 has a microaddress section 9-2, which is a field that stores the start address of a microprogram corresponding to an instruction code, and a counter section 9-1, which is a field that stores the number of executions of an instruction word. Writing can be controlled separately.

The output of the micro address section 9-2 is input to the micro address selector 12 via the signal line 108, and the output of the counter section 9-1 is input to the control device 2 and the adder 8 via the signal line 10.
7. The output of adder 8 is connected to signal line 105
is input to the data register 7, the data register 7 holds the output of the adder 8, and under the control of the control circuit 15,
The held data is sent to the counter section 9-1 via the signal line 106.
Enter. The output of the micro address selector 12 is connected to the control store 13 and the adder 1 by a signal line 111.
1, the output of adder 11 is input to micro address register 10 via signal line 110, and the output of micro address register 10 is input to micro address selector 12 via signal line 109. The output of the control store 13 is input to the control register 14 via a signal line 112, and the output thereof is input to the control circuit 15 via a signal line 115. The control circuit 15 is the control device 2
is controlled by a signal line 113 from the signal line 114,
Instruction register 4, counter 5, selector 6, data register 7, counter section 9-1 of pathfinder memory 9
The signal line 116 controls the micro address register 10 and the micro address selector 12.

Next, the operation of the embodiment will be explained.

The information processing device 1 performs information processing by repeating the operations of fetching a command from the memory device 3, decoding it, fetching a necessary operand, and applying an operation.

Here, when the control device 2 instructs the information processing device 1 to initialize recording of the number of executions of instructions, the control circuit 15 controls the following operations. First, reset the counter 5 and data register 7, and connect the input of the selector 6 to the signal line 10.
3 side, the reset value "0" of the counter 5 passes through the selector 6 and becomes the address of the pathfinder memory 9, and when a write pulse is issued to the counter section 9-1 of the pathfinder memory 9, the content of the register 7 is "0". " is written.

Next, when the value of the counter 5 is incremented by 1 and the same operation is performed, "0" is written to the address "1" of the counter section 9-1. When the process is repeated until the last address in the pathfinder memory 9 is reached, the initialization of the counter section 9-1 is completed.

Next, when the control device 2 issues an instruction to start counting the number of executions of each command, the control circuit 15 sets the input of the selector 6 to the signal line 102 side. Field 14 of control register 14 holding the current microinstruction
-2 issues an instruction to start executing the next instruction, the control circuit 15 controls the following operations.

The input of the mass micro address selector 12 is connected to the signal line 10.
Switch to 8. When the next instruction word is retrieved from the memory device 3 and placed in the instruction register 4, the instruction code section 4-
The output of 1 passes through the selector 6 and becomes the address of the pathfinder memory 9, and the corresponding micro address section 9-
The output of 2 passes through the micro address selector 12 and becomes the address of the control store 13. This is the start address of the microprogram that processes this instruction word, and the output of the control store 13 is set in the control register 14 and instruction processing begins. Further, the output of the micro address selector 12 is incremented by 1 by the adder 11 and set in the micro address register 10.

This output is connected to the micro address selector 12, and by connecting the input to the signal line 109, the address can be set to 1.
The microprogram is executed continuously. At this time, the output of the counter section 9-1 is added by 1 in the adder 8 and sent to the data register 7.
It is written again to the same address in the counter section 9-1.

This means that the number of executions of this instruction has increased by 1.9 In this way, each time a new instruction is executed, the value of the counter section 9-1 corresponding to each instruction increases by 1.

Next, when the control device 2 instructs the end of counting and reads out the counting results, the control circuit 15 first controls the counter 5.
is reset, and the input of selector 6 is switched to the signal 1103 side. Then, while the counter 5 is incrementing by 1, the output of the counter section 9-1 is read out to the control device 2 via the signal line 107.

In this way, it is possible to measure the number of times each instruction is executed in a certain period of time.

〔Effect of the invention〕

As explained above, the present invention can measure the number of instruction executions of an information processing device with the addition of as little hardware as possible, so the number of instruction executions can be measured with a low-cost device, and each instruction can be executed at once. This has the effect of being able to measure the number of executions.

[Brief explanation of drawings]

The figure is a circuit diagram showing one embodiment of the present invention. l... Information processing device, 2... Control device, 3... Memory device, 4... Instruction register, 5... Counter,
6... Selector, 7... Data register, 8.11
...Adder, 9...Pathfinder memory, lO
...Micro address register, 12...Micro address selector, 13...Control store, 1
4...Control register, 101-116...
Signal line.

Claims (1)

[Claims] (1) An instruction register that reads and holds a microinstruction word divided into an instruction code part and an operand part from a storage device, and a memory that takes the instruction code part of this register as an address input and outputs the start address of the corresponding microprogram. In the instruction execution count circuit of the information processing device, the memory includes, in addition to a first field for storing the start address of the microprogram corresponding to the instruction code section,
It has a second field for storing the number of executions of the instruction word, each of which can be written separately, and one field is stored in the second field of the memory for each execution of the instruction word.
means for adding, instructing the initialization of a second field of the memory, and instructing the start and end of counting of the number of executions of the instruction word;
and a control device that instructs to read out the counting results; and a control circuit that controls counting the number of instruction executions and reading out the counting results based on instructions from the control device and instructions to start executing the next new instruction word by the microprogram. An instruction execution count circuit for an information processing device, comprising: