Density dependent vector mask operation control apparatus and me

Details Density dependent vector mask operation control apparatus and me Density dependent vector mask operation control apparatus and me

1996-09-03

1999-08-17

Donaghue, Larry D.

39580004, 39580006, 395565, G06F 1500

Patent

active

059406259

ABSTRACT:
A vector processing system which uses vector masks to determine whether or not to perform operations on operands corresponding to bit positions within the mask is disclosed. An approximation of the number of no-operation representative bits in a vector mask register is made, and such bits are skipped to improve the performance of vector mask based operations. The number of consecutive no-op representative bits, as represented by zero values, skipped is a power of two to simplify the circuitry and logic involved in skipping such operations.

REFERENCES:
patent: 4128880 (1978-12-01), Cray
patent: 4630192 (1986-12-01), Wassel et al.
patent: 4661900 (1987-04-01), Chen et al.
patent: 4680730 (1987-07-01), Omoda et al.
patent: 4841438 (1989-06-01), Yoshida et al.
patent: 4852049 (1989-07-01), Sakai
patent: 5241490 (1993-08-01), Poon
patent: 5568410 (1996-10-01), Bechade
"The Best Way to Achieve Vector-Like Performance" J.E. Smith Cray Research Inc., Apr. 1994.

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