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:
Jun. 12, 2018
Filed:
Nov. 09, 2015
International Business Machines Corporation, Armonk, NY (US);
Motohiro Kawahito, Kanagawa-ken, JP;
International Business Machines Corporation, Armonk, NY (US);
Abstract
Method, program and system for code optimization. A sign assignment instruction with identically sized packed decimal format input and output operands is detected where the sign assignment instruction assigns a value of zero to a packed decimal data value input operand having a value of negative zero. If the input operand to the sign assignment instruction does not result from an add or subtract operation, or the value of the input operand is not greater than a value prior to that operation, the possibility that the value of the input operand of the sign assignment instruction is negative zero is checked when the input operand and the output operand have identical addresses. An instruction is generated and inserted for executing the sign assignment instruction only when there is the possibility that the operand value is negative zero.