公开(公告)号：DE112012005014T5

公开(公告)日：2014-08-28

申请号：DE112012005014

申请日：2012-11-21

Applicant: IBM

Inventor： CARTER JOHN BRUCE ,  RETTER ERIC EUGENE ,  STUECHELI JEFFREY A ,  RAJAMANI KARTHICK ,  MEALEY BRUCE

IPC: G06F7/38 ,  G06F7/76

Abstract: Bereitgestellt werden Mechanismen zum Ausführen einer arithmetischen Gleitkommaoperation in einem Datenverarbeitungssystem. Eine Vielzahl von Gleitkommaoperanden der arithmetischen Gleitkommaoperation wird empfangen, und Bits in einer Mantisse von mindestens einem Gleitkommaoperanden aus der Vielzahl von Gleitkommaoperanden werden verschoben. Ein oder mehrere Bits der Mantisse, die aus dem Bitbereich der Mantisse von mindestens einem Gleitkommaoperanden heraus verschoben werden, werden gespeichert, und ein Vektorwert wird auf der Grundlage des bzw. der gespeicherten einen oder mehreren Bits der Mantisse erzeugt, die aus dem Bitbereich der Mantisse des mindestens einen Gleitkommaoperanden heraus verschoben werden. Ein Ergebniswert wird für die arithmetische Gleitkommaoperation auf der Grundlage des Vektorwerts und der Vielzahl von Gleitkommaoperanden erzeugt.

公开(公告)号：CA2568747C

公开(公告)日：2010-11-02

申请号：CA2568747

申请日：2005-05-18

Applicant: IBM

Inventor： ASLOT VISHAL CHITTRANJAN ,  MEALEY BRUCE

IPC: G06F9/46 ,  G06F12/00 ,  G06F12/10

Abstract: A system and method for extending the use of the cross-memory descriptor in a server partition environment such that it may be used to describe another partition's memory, e.g., a client partition's memory (referred to hereafter as a "remote" memory), are provided. 'With the system and method, when an operating system in a logically partitioned computing system is initialized, operating system kernel services are invoked that examine a device tree of the computing system and generate an extended cross-memory descriptor that describes the local memory of another logical partition, which is a remote memory to the present logical partition. When an access to a remote memory is required to perform an operation, the operating system of the server partition uses the stored extended cross-memory descriptor to perform the remote memory access.

公开(公告)号：GB2511986A

公开(公告)日：2014-09-17

申请号：GB201411244

申请日：2012-11-21

Applicant: IBM

Inventor： STUECHELI JEFFREY A ,  RETTER ERIC EUGENE ,  RAJAMANI KARTHICK ,  MEALEY BRUCE ,  CARTER JOHN BRUCE

IPC: G06F7/483 ,  G06F5/01

Abstract: Mechanisms are provided for performing a floating point arithmetic operation in a data processing system. A plurality of floating point operands of the floating point arithmetic operation are received and bits in a mantissa of at least one floating point operand of the plurality of floating point operands are shifted. One or more bits of the mantissa that are shifted outside a range of bits of the mantissa of at least one floating point operand are stored and a vector value is generated based on the stored one or more bits of the mantissa that are shifted outside of the range of bits of the mantissa of the at least one floating point operand. A resultant value is generated for the floating point arithmetic operation based on the vector value and the plurality of floating point operands.

公开(公告)号：SG183093A1

公开(公告)日：2012-10-30

申请号：SG2012041653

申请日：2011-02-15

Applicant: IBM

Inventor： MOODY JAMES BERNARD ,  MEALEY BRUCE

Abstract: A method, system, and computer usable program product for a dual mode reader writer lock. A contention condition is determined in using an original lock. The original lock manages read and write access to a resource by several processes executing in the data processing system. The embodiment creates a set of expanded locks for use in conjunction with the original lock. The original lock and the set of expanded locks forming the dual mode reader writer lock, which operates to manage the read and write access to the resource. Using an index within the original lock, each expanded lock is indexed such that each expanded lock is locatable using the index. The contention condition is resolved by distributing requests for acquiring and releasing the read access and write access to the resource by the several processes across the original lock and the set of expanded locks.