The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 02, 1999
Filed:
Nov. 17, 1995
Krishna Subramanian, Mountain View, CA (US);
Boris Baylin, Palo Alto, CA (US);
Sun Microsystems, Inc., Mountain View, CA (US);
Abstract
Apparatus and methods are disclosed for performing time-reversed scheduling of a data dependency graph representing a target program instruction loop in an optimizing compiler. The instruction scheduling function is the modulo scheduling function of an optimizing compiler and it is noted that the time-reverse transforms preserve all modulo constraints. Most modern microprocessors have the ability to issue multiple instructions in one clock cycle and/or possess multiple pipelined functional units and typically contain multi-level memory devices such as on-chip cache, off-chip cache as well as main memory. For such microprocessors this invention can, where applicable, accelerate the process of modulo-scheduling loops in the target program code. The invention consists of a technique to transform the data dependency graph of the target program instruction loop in order to produce an improved schedule of the loop instructions.