Intel Corporation

Joseph A McMahon

Matthew C Merten

James Hadley

Avinash Sodani

Ravi Rajwar

Robert S Chappell

Vijaykumar Balaram Kadgi

Laura A Knauth

Morris Marden

Justin M Deinlein

Yury N Ilin

Grace C Lee

Fariborz Tabesh

David Lim

A processor includes a processing unit including a storage module having stored thereon a physical reference list for storing identifications of physical registers that have been referenced by multiple logical registers, and a reclamation module for reclaiming physical registers to a free list based on a count of each of the physical registers on the physical reference list.

Physical reference list for tracking physical register sharing

An apparatus is described having an out-of-order instruction execution pipeline. The out-of-order execution pipeline has a first circuit and a second circuit. The first circuit is to hold a pointer to physical storage space where information is kept that cannot yet be confirmed as being free of potential dependencies on the information. The second circuit is to hold the pointer if the pointer existed in the first circuit when a non speculative region of program code ended and upon retirement of a following speculative overwriter instruction originally coded to overwrite the information.

Copy-on-write buffer for restoring program code from a speculative region to a non-speculative region

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Portland, OR, United States of America

Joseph A McMahon