History Buffer for Multiple-Field Registers

An information handling system comprising:

• one or more processors;
• a memory coupled to at least one of the processors;
• and
• a set of computer program instructions stored in the memory and executed by at least one of the processors in order to perform actions of:
• receiving dispatch information corresponding to an instruction, wherein the dispatch information identifies a subset of a plurality of register fields included in a register;
• selecting a history buffer entry included in a history buffer, wherein the history buffer entry comprises a plurality of history buffer field sets that each include an itag field, resulting in a plurality of itag fields included in the selected history buffer entry;
• and
• modifying a subset of the plurality of history buffer field sets using existing content from the identified subset of register fields, wherein the modifying includes storing one or more itag values in each of the itag fields included in each of the subset of history buffer field sets.

A computer program product stored in a computer readable storage medium, comprising computer program code that, when executed by an information handling system, causes the information handling system to perform actions comprising:

• receiving dispatch information corresponding to an instruction, wherein the dispatch information identifies a subset of a plurality of register fields included in a register;
• selecting a history buffer entry included in a history buffer, wherein the history buffer entry comprises a plurality of history buffer field sets that each include an itag field, resulting in a plurality of itag fields included in the selected history buffer entry;
• and
• modifying a subset of the plurality of history buffer field sets using existing content from the identified subset of register fields, wherein the modifying includes storing one or more itag values in each of the itag fields included in each of the subset of history buffer field sets.