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:
May. 22, 2001
Filed:
Aug. 21, 1998
Applicant:
Inventor:
Christopher Gray, Austin, TX (US);
Assignee:
Advanced Micro Devices, Inc., Sunnyvale, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06F 1/576 ;
U.S. Cl.
CPC ...
G06F 1/576 ;
Abstract
A method for determining the default operating mode of a code segment by determining whether an instruction modifies bits in both the upper-order and lower-order halves of a register. A register is set to a known value and an instruction which operates on the register is subsequently executed. After execution of the instruction, it is determined whether the high-order bits of the register have been modified by the instruction. If the instruction modifies the high-order bits of the register, a first default mode is indicated and, if the instruction does not modify the high-order bits of the register, a second default mode is indicated.