System for compiling iterated loops based on the possibility of

Details System for compiling iterated loops based on the possibility of System for compiling iterated loops based on the possibility of

1991-07-17

1994-05-31

Lee, Thomas C.

Boots, shoes, and leggings

395375, 3642613, 364263, 364DIG1, G06F 930

Patent

active

053177436

ABSTRACT:
A compiler apparatus in a computer converts source program to object program to be executed by the computer. If loop instructions are included in the object program, the resource reference extraction section extracts resources referred by the loop instructions and the resource change extraction section extracts resources changed by the loop instructions. The loop parallel decision section decides possibility of parallel execution for different stages of the loop instructions according to the extraction result. The code generation section generates object instructions which are parallely executed if the loop parallel decision section decides that the loop instructions can be parallely executed, generates object instructions which are not parallely executed if the loop parallel decision section decides that the loop instructions cannot be parallely executed, and generates object instructions which branches parallel execution instructions or non-parallel execution instructions according to condition to parallely execute at execution mode if the loop parallel decision section cannot decide whether the loop instructions can be parallely executed or not.

REFERENCES:
patent: 4710872 (1987-12-01), Scarborough
patent: 4807126 (1989-02-01), Goton
patent: 4833606 (1989-05-01), Iwasawa
patent: 5067068 (1991-11-01), Iwasawa
patent: 5088034 (1992-02-01), Ihara
patent: 5109331 (1992-04-01), Ishida
David A. Padua and Michael J. Wolfe, "Advanced Compiler Optimizations for Supercomputers", Dec. 1986, Commun. of the ACM, vol. 29, No. 12.
J. Gazdag & H.-H. Wang, "Concurrent Computing by Sequential Staging of Tasks," IBM Systems Journal, vol. 28, No. 4, 1989, pp. 646-660.

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