JPS61187044A - Information processor - Google Patents

Abstract

PURPOSE:To make it unnecessary to wait the end of execution of an arithmetic unit before execution of an arithmetic exception mask change instruction, by providing a register where arithmetic exception mask information is held in accordance with the arithmetic unit from which an arithmetic exception may be reported. CONSTITUTION:A control circuit 2 decodes the instruction word in an instruction register 1 and instructs an arithmetic unit 8 to execute it if it is the instruction to be executed by the unit 8. At this time, contents of a register 3 where arithmetic exception mask information is held are taken into a mask register 5 corresponding to the arithmetic unit 8. If arithmetic exceptions are reported from arithmetic units 8-10, interrupt request signal generating circuits 11-13 compares them with contents of mask registers 5-7 corresponding to individual arithmetic units and generate and send interrupt request signals due to occurrence of arithmetic exceptions to the control circuit 2. In case of the arithmetic exception mask change instruction, contents of a mask register 3 and loaded data are compared with each other by a mask comparator; and if they coincide with each other, the following instruction is executed without waiting the end of execution of each arithmetic unit.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an information processing device with improved instruction execution control.

(Prior Art) Conventionally, in this type of information processing device, it is common for the information processing device to have one register for storing operation exception mask information that controls whether or not to perform interrupt processing when an operation exception occurs. It was a target.

(Problem to be Solved by the Invention) Therefore, when executing an instruction to change the operation exception mask information, the execution of the operation instruction that previously sent the instruction execution instruction is completed and the timing for reporting the operation exception has passed. The drawback was that you had to wait until Further, at this time, even if the contents of the register storing the operation exception mask information and the newly stored i-space information are the same, it is necessary to wait in the same way as described above.

An object of the present invention is to avoid waiting for the completion of execution of the arithmetic instruction that previously issued an instruction execution instruction when executing an instruction that changes arithmetic exception mask information.
An object of the present invention is to provide an information processing device that can improve performance.

(Means for Solving the Problem) In order to achieve the above object, an information processing apparatus according to the present invention provides information for determining whether or not to execute interrupt processing based on operation exception mask information when an operation exception occurs. In the processing device,
a first mask register for storing arithmetic exception mask information; a plurality of arithmetic units that generate an arithmetic exception; and when an instruction execution instruction is given to the arithmetic unit, the contents of the first mask register are stored corresponding to the arithmetic unit; a second mask register; an interrupt request signal generation circuit for each of the arithmetic units that sends an interrupt processing request based on the contents of the jg2 register when the arithmetic unit reports the occurrence of an arithmetic exception; a comparator that compares the original content of the first mask register with the new content stored in the first mask register when executing an instruction that changes the contents of the mask register; When receiving the output, the control circuit controls whether to proceed with the execution of the subsequent instruction without waiting for the completion of the execution of the arithmetic unit or after waiting, depending on the output result.

(Example) Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of an information processing apparatus according to the present invention. The instruction register 1 holds instructions to be executed by the processing device.

The control circuit 2 decodes the command, issues an instruction to execute the command, and performs interrupt processing in accordance with an interrupt processing request. Mask register 3 is a register that holds operation exception mask information. The arithmetic units 8, 9, and 10 are circuits that execute arithmetic operations based on arithmetic instructions, and each arithmetic unit usually executes a different type of operation. For example, 8 is a fixed point arithmetic unit, and 9 is a floating point arithmetic unit. When the control circuit 2 decodes the instruction word in the instruction register 1 and determines that it is an instruction to be executed by the arithmetic unit 8, for example, it gives an execution instruction to the arithmetic unit 8. At the time of this execution instruction, the mask register 5 corresponding to the arithmetic unit 8
The contents of mask register 3 are taken in. That is, when giving an execution instruction to each arithmetic unit, the contents of the mask register 3 are taken into the mask register corresponding to the arithmetic unit. The interrupt request signal generation circuit 11.12.13 is connected to each calculation unit 8.9. When an operation exception report is received due to IQ, the mask register 5゜6 or 7 corresponding to each operation unit is
It is compared with , and an interrupt request signal is generated due to the occurrence of an arithmetic exception. This interrupt request signal is sent to the control circuit 2 via a signal line (not shown). If the instruction stored in the instruction register 1 is a mask change instruction for an operation exception, the control circuit 2 instructs the mask register 3 to load data. At this time, the mask comparator 4 compares the contents stored in the mask register 3 with the data to be loaded, and the result is given to the control circuit 2. When the comparison result in the comparator 4 indicates that the control circuit 2 is different, the control circuit 2 causes the execution of the instruction subsequent to the arithmetic exception mask change instruction to wait until the execution of each arithmetic unit is completed. Conversely, if they are not different, that is, they are the same, the subsequent instructions are executed without waiting for the completion of execution of each arithmetic unit.

(Effects of the Invention) As described above, the present invention provides registers that hold calculation exception mask information for calculation units that may perform calculation exception reporting, so that the calculation unit It is said that performance can be improved because there is no need to wait for the execution of the arithmetic unit to finish, and if there is no change in the contents of the mask register before and after execution of the arithmetic exception mask change instruction, there is no need to wait for the execution of the arithmetic unit to finish. effective.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of an information processing apparatus according to the present invention. 1... Φ instruction register 2... Control circuit 3... Arithmetic exception mask 4... Mask comparators 5-7... Arithmetic unit corresponding mask registers 8-10
...Arithmetic unit

Claims (1)

[Claims] In an information processing device that determines whether or not to execute an interrupt process based on operation exception mask information when an operation exception occurs, a first mask register that stores operation exception mask information;
a plurality of arithmetic units that generate an arithmetic exception; a second mask register that stores the contents of the first mask register corresponding to the arithmetic unit when an instruction execution instruction is given to the arithmetic unit; and an arithmetic exception from the arithmetic unit. When reporting an occurrence, the interrupt request signal generation circuit for each of the arithmetic units sends an interrupt processing request according to the contents of the second register, and when executing an instruction to change the contents of the first mask register, the A comparator that compares the original content of the first mask register with the new content stored in the first mask register; An information processing device comprising: a control circuit that controls whether execution is to proceed without waiting for the completion of execution of an arithmetic operation by an arithmetic unit or to proceed after waiting.