JPH04297924A - Shift operation circuit - Google Patents

Abstract

PURPOSE:To shorten operation porcessing time and to improve the throughput of a data processor by executing the preparation processing of a conventional operation resource and the correction processing of an operated result simultaneously with a shift operation. CONSTITUTION:An operation data mask-controlled by a mask control circuit 4 is outputted by a mask control register 2, which shows the presence/absence of the mask control for executing the mask control of the operation resource on an operation resource signal line 5, and a mask register 3 to show which part of the operation resource is masked and a mask control circuit 4, which the operation resource is mask controlled by the contents of the register 2 and 3, the operation data is inputted to a shift operation circuit part 1, the shift operation is executed at the shift operation circuit 1, and the operated result is outputted to an operated result output signal line 6.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shift calculation circuit in a data processing device, and more particularly to mask control of the shift calculation circuit.

0002

[Prior Art] Conventionally, in this type of shift calculation circuit, when performing mask control on resource data and calculation results, mask control is performed in a separate circuit, and mask control is not performed in the shift calculation circuit. .

0003

[Problems to be Solved by the Invention] As mentioned above, in conventional shift calculation circuits, mask control is performed in a separate circuit to obtain mask-controlled calculation resources, or a separate circuit is also required to correct the calculation results. This has the disadvantage that it takes time to obtain the necessary data, which reduces the performance of the data processing device.

[0004] An object of the present invention is to have a mask control register that indicates the presence or absence of mask control, a mask register that indicates the contents of mask control, and a mask control circuit that performs mask control of arithmetic resources by outputting these contents. ,
To solve the above drawbacks, the creation process of calculation resources and the correction process of calculation results can be performed simultaneously with shift calculation.
It is an object of the present invention to provide a shift calculation circuit that reduces calculation processing time and improves the processing ability of a data processing device.

[0005]

[Means for Solving the Problems] A shift arithmetic circuit of the present invention processes arithmetic resources in a data processing device and performs operations on them as arithmetic data. a mask control register indicating which part of the calculation resource is to be masked, a mask control circuit which performs mask control of the calculation resource according to the contents of the mask control register and the mask register, and outputs calculation data. There is.

[0006]

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

FIG. 1 is a block diagram of a shift calculation circuit according to an embodiment of the present invention.

In FIG. 1, the shift arithmetic circuit of this embodiment includes a shift arithmetic circuit 1, a mask control register 2, a mask register 3, a mask control circuit 4, an arithmetic resource signal line 5, and an arithmetic result output signal. It is composed of a line 6, an insertion data signal line 7, an arithmetic input signal line 8, a mask control register output signal line 9, and a mask register output signal line 10.

[0009] Each of them is connected as follows.

The mask control circuit section 4 has a mask register output signal line that transfers the value of the arithmetic resource signal line 5 and the contents of the mask control register 2 and the value of the mask control register output signal line 9 that transfers the contents of the mask register 3. The value of 10 is input, the calculation resources are mask-controlled, and the calculation resources are output through the calculation input signal line 8. The shift calculation circuit section 1 receives the value of the calculation input signal line 8 and the value of the insertion data signal line 7 as input,
A shift operation is performed and the result of the operation is outputted via the operation result output signal line 6.

Next, a mask control method will be explained.

Mask control register 2 and mask register 3
The contents of this mask control register 2 are given in advance as data indicating whether or not this shift operation is masked, and in the case of masking, data specifying how to mask. Register output signal line 9
Also, the contents of the mask register 3 are given by the mask register output signal line 10.

When calculation resource data that has not yet been subjected to mask control through the calculation resource signal line 5 is input to the mask control circuit section 4, the necessary mask control is performed, and the mask control result data is shifted through the calculation input signal line 8. The signal is input to the arithmetic circuit 1. After this, the same operation as the shift operation in the prior art is performed, and the result of the operation is output to the operation result output signal line 6, thereby performing the mask operation and the shift operation at the same time.

[0014]

As explained above, the shift arithmetic circuit of the present invention has a mask control register that indicates the presence or absence of mask control, a mask register that indicates the contents of mask control, and masks arithmetic resources by outputting these contents. By having a mask control circuit for controlling the data, it is possible to perform the conventional calculation resource creation processing and calculation result correction processing at the same time as the shift calculation, reducing calculation processing time and improving the processing capacity of the data processing device. The effect is that it can be done.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a shift calculation circuit according to an embodiment of the present invention.

[Explanation of symbols]

1 Shift operation circuit 2 Mask control register 3 Mask register 4 Mask control circuit 5 Computation resource signal line 6 Operation result output signal line 7 Insert data signal line 8 Arithmetic input signal line

Claims (1)

[Claims] 1. A shift arithmetic circuit that processes arithmetic resources in a data processing device and performs arithmetic operations as arithmetic data, comprising: a mask control register indicating whether or not mask control is to be performed to mask-control the arithmetic resources; A mask register that indicates which part to mask,
A shift arithmetic circuit comprising: a mask control circuit that performs mask control on the arithmetic resource according to the contents of the mask control register and the mask register, and outputs arithmetic data.