Title:
INSTRUCTION SELECTING METHOD AT EXECUTION OF CONDITIONAL INSTRUCTION
Document Type and Number:
Japanese Patent JPS59180668
Kind Code:
A
Abstract:
PURPOSE:To shorten the execution time of an instruction having the small number of turning a mask on by recognizing the number to turn the mask on in a vector processor. CONSTITUTION:When mask information indicating whether a conditional instruction is to be executed or not to respective elements and the number of turning the mask on in each vector length are set up in a mask register 28 at the execution of the instruction, the vector processor checks the number to turn the mask on. The execution of the instruction is skipped under a condition that the number to turn the mask on is ''0''. Under a condition that the number to turn the mask on is smaller than a prescribed threshold, a part turning the mask on is fetched by using a vector length reduction processing instruction, new vector data are formed to calculate the vectors and the calculated result is inputted to the part turning the mask on. Under a condition that the number of turning the mask on is larger than he prescribed threshold, the factor turning the mask on is calculated.
Inventors:
HOTSUTA KOUICHIROU
KAMIYA YUKIO
TAKIUCHI MASAAKI
HIRABAYASHI TOSHIHIRO
AOKI MASAKI
KAMIYA YUKIO
TAKIUCHI MASAAKI
HIRABAYASHI TOSHIHIRO
AOKI MASAKI
Application Number:
JP5548183A
Publication Date:
October 13, 1984
Filing Date:
March 31, 1983
Export Citation:
Assignee:
FUJITSU LTD
International Classes:
G06F9/38; G06F15/78; G06F17/16; (IPC1-7): G06F9/38
Attorney, Agent or Firm:
Kyotani Shiro