International Business Machines Corporation

David D Dukro

Anthony J Bybell

Michael K Gschwind

Bradly George Frey

Richard William Doing

An address translation capability is provided in which translation structures of different types are used to translate memory addresses from one format to another format. Multiple translation structure formats (e.g., multiple page table formats, such as hash page tables and hierarchical page tables) are concurrently supported in a system configuration. This facilitates provision of guest access in virtualized operating systems, and/or the mixing of translation formats to better match the data access patterns being translated.

Asymmetric co-existent address translation structure formats

A method for reducing overhead on a loop of a plurality of instructions is disclosed. The method includes providing a carry mask, the carry mask having a first value for the loop being performed at least the particular number of times minus one and a second value for at least a last instruction of the loop being performed a last time, providing addition logic, wherein the carry mask and a current instruction address of the plurality of instructions correspond to inputs of the addition logic and determining which of the plurality of instructions is to be executed using the carry mask to provide a resultant of the addition logic based on the carry mask and the current instruction address of the plurality of instructions.

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Morrisville, NC, United States of America

David D Dukro