JPH035881A - Vector arithmetic unit - Google Patents

Abstract

PURPOSE:To easily raise the vectoring rate of processing by generating mask data count simultaneously with the generation of mask data. CONSTITUTION:The subject unit consists of a storage part 100, a vector comparison arithmetic part 200, a mask data count storage part 300, a mask data generating part 400, and a mask data count part 500. Then, the comparison of a vector element is executed, and at the same time that the mask data based on this compared result is generated, the mask data count is generated. Thus, the vectoring rate in a FORTRAN program can be improved without generating newly processing to check the number of elements generated as the mask data (number of elements for which IF statement holds good) by a scalar instruction.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a vector arithmetic device.

[Conventional technology]

Conventionally, vector arithmetic units have been able to execute vector instructions even when the FORTRAN program includes the innermost DO loop or IF statement, thereby improving vector processing efficiency during processing.

That is, first, in the mask generation vector instruction, it is determined whether the IF statement is established for each element of the vector,
Mask data is created according to the results. Each bit of this mask data is "0" or "1" and indicates whether or not the IF statement is established for each element of the vector.

Once the mask data is generated in this way, a vector operation is then executed using a vector instruction with mask control. In vectors with mask control, operations are generally performed only on elements for which an IF statement is true while referring to mask data.

[Problem to be solved by the invention]

In the conventional vector calculation device described above, calculations are performed on elements for which an IF statement is true, but the number of elements (IF
It is not possible to detect the number of elements in a sentence. Also, if you try to detect it, you will have to add new processing.

For this reason, for example, when calculating the average value of a series of data excluding the data below the standard value in statistics etc., the total can be calculated, but the number of elements (the number of data above the standard value) is calculated. Since there is no information, the process for calculating the number of elements is created and executed using scalar instructions, which has the disadvantage of reducing the vectorization rate of the process and reducing processing efficiency.

[Means to solve the problem]

The vector arithmetic device of the present invention includes a storage unit that holds vector elements used in vector arithmetic operations and mask data generated by a mask generation instruction, a vector comparison arithmetic unit that performs a comparison operation of the vector elements, and a vector comparison arithmetic unit that performs a comparison operation of the vector elements. a mask data generation unit that generates mask data based on the calculation results; a mask data count unit that creates a mask data count based on the calculation results from the vector comparison calculation unit;
The mask data count storage unit stores the mask data count created by the mask data count unit, compares vector elements, generates mask data based on the comparison result, and creates a mask data count at the same time.

〔Example〕

Next, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention, which includes a storage section 100 that holds vector elements used in vector operations and mask data generated by the mask data generation section 400, and a storage section 100 that stores mask data generated by the mask data generation section 400. A vector comparison calculation unit 200 that performs a comparison operation on the output vector elements, a mask data generation unit 400 that generates mask data based on the calculation result of the vector comparison calculation unit 200, and a vector comparison calculation unit 2.
The mask data count generation section 500 generates a mask data count based on the calculation result of 00, and the mask data count storage section 300 stores the contents generated by the mask data count generation section 500.

The vector comparison calculation unit 200 includes two registers 210 that hold vector elements read out from the storage unit 100;
220, a comparison operation circuit 230 that performs a comparison operation on vector elements of the registers 210 and 220, and a comparison operation circuit 230.
It is comprised of a register 240 that receives and receives operation results.

The mask data generation unit 400 includes a mask data generation circuit 430 that turns on or generates “1” based on the comparison result of the comparison calculation circuit 230, and shifts the bit generated by the mask data generation circuit 430 to the last digit of the mask data register 410. a mask data shift circuit 420 added as a
Mask data register 41 that holds mask data
Consists of 0.

The mask data count 500 includes a mask data count creation circuit 520 that performs a "+0" or "+1" operation based on the comparison result of the comparison calculation circuit 230, and a mask data count register 5 that holds the mask data count.
Consists of 10.

Next, the operation of this embodiment will be explained.

As shown in FIG. 2, vector elements are transferred from the storage unit 100 to the register 210 with the value “X” and the register 220 with the value “Y”.
When the data is transferred, the contents of the register 210 and the register 220 are compared and operated by the comparison operation circuit 230, and the signal of the comparison result is sent to the mask data generation circuit 430 and the mask data count generation circuit 520.

Next, as shown in FIG. 3, one bit of the mask data generation circuit 430 is added to the last digit of the contents of the mask data register 410 by a signal from the comparison operation circuit 230, and the mask data shift circuit 420 shifts the data one bit to the left. At the same time, the contents of the mask data count register 510 are changed to "+0" or "+1" by the mask data count creation circuit 520 based on the signal from the comparison calculation circuit 230, and the result is stored in the mask data register 410. Enter into mask data count register 510.

Finally, the contents of the mask data register 410 are stored in the storage unit 10.
0 and sends the contents of the mask data count register 510 to the mask data count storage section 300, mask data count information can be created and stored at the same time as mask data is generated.

〔Effect of the invention〕

As explained above, since the present invention can create a mask data count at the same time as mask data generation, a process to check the number of elements generated as mask data (the number of elements for which the IF statement was established) is created using a scalar instruction. The vectorization rate in FORTRAN programs can be improved without any problems.

100... Storage unit, 200 Old... Vector comparison calculation unit, 210. 220.240----・-1/
Register, 230... Comparison calculation circuit, 300...
...Mask data count storage section, 400...
...Mask data generation unit, 410...Mask data register, 42o...Mask data shift circuit, 43o...Mask data generation circuit, 50
0...Mask data callan) part, 510...
...Mask data count register, 520...
...Mask data count creation circuit.

Claims (1)

[Scope of Claims] A storage unit that holds vector elements and mask data; a vector comparison calculation unit that performs a comparison operation on the vector elements; and a mask data generation unit that generates the mask data based on the calculation result of the vector comparison calculation unit. a mask data count creation part that counts +0 or +1 according to the calculation result of the vector comparison calculation part; and a mask data count storage part that stores the mask data count created by the mask data count creation part. Characteristic vector arithmetic device.