Computer methods for writing a scalar value to a vector

Details Computer methods for writing a scalar value to a vector Computer methods for writing a scalar value to a vector

1996-10-18

1999-12-21

An, Meng-Ai T.

Electrical computers and digital processing systems: processing

Processing architecture

Vector processor

712 2, 712 4, G06F 1516

Patent

active

060063157

ABSTRACT:
A method is provided for writing a scalar value to a vector V1 without reading the vector from a storage device. A scalar value to be written into the vector at a specified position and a scalar value (index) representing such position are read from a storage device into an Arithmetic Logic Unit (ALU) of a vector processor. The ALU then generates another vector V2 having multiple copies of the scalar value to be written into V1. ALU also generates a mask representing the index. The vector V2 is then delivered to the storage storing V1, but the mask is applied so that only one or more, but not all, copies of the scalar value are written from V2 to the storage. The rest of the vector V1 remains unchanged. The invention reduces register file read contention. Furthermore, if the updated V1 (i.e. V1 having the scalar value) is to be used in the next instruction, a copy of V1 is read from the storage and is updated from V2 and the mask, simultaneously with V1 being updated in the storage. Thus, the updated V1 need not be read from the storage.

REFERENCES:
patent: 3827031 (1974-07-01), Kastner et al.
patent: 4933839 (1990-06-01), Kinoshita et al.
patent: 5226135 (1993-07-01), Mishina et al.
patent: 5331554 (1994-07-01), Graham
patent: 5461586 (1995-10-01), Nasu
patent: 5511210 (1996-04-01), Nishikawa et al.

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