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:
Oct. 07, 2003
Filed:
Jan. 06, 1998
Bich-Cau Le, San Jose, CA (US);
Hewlett-Packard Development, L.P., Houston, TX (US);
Abstract
The inventive emulator dynamically translates instructions in code written for a first architecture into code for a second architecture. The emulator designates various checkpoints in the original code, and speculatively reorders the placement of the translated code instructions according to optimization procedures. If during the execution of the reordered code, a trap should occur, then the emulator resets the original code to the most recent checkpoint and begins executing the original code sequentially in a line-by-line manner until the section is completed or branched out of. The original code is reset by changing the program counter to the checkpoint, and reversing the effects of each instruction which has been executed subsequent to the checkpoint. Thus, any native instructions which correspond to original instructions which occur sequentially prior to the checkpoint have been executed, and any native instructions which correspond to original instructions which occur sequentially subsequent to the checkpoint have not been executed.