System, apparatus and method for throttling fusion of micro-operations in a processor

A processor comprising:

• an allocation circuit to allocate micro-operations (μops) to execution ports that couple to execution units;
• a scheduler circuit coupled to the allocation circuit, wherein the scheduler circuit is to schedule the μops to allocated execution ports;
• the execution units coupled to the scheduler circuit to execute scheduled μops, wherein a subset of the execution units are capable of execution of a fused μop;
• and
• a memory to store a plurality of entries, each of the plurality of entries to store an identifier of a fused uop and associated historical information comprising a confidence value,
• wherein the allocation circuit is to fuse at least one pair of producer-consumer μops into a fused μop when the at least one pair is to be scheduled in a same cycle and to not fuse a first consumer μop with a first producer μop based at least in part on historical information associated with the first consumer μop, and wherein the allocation circuit is to prevent fusion of the first consumer μop with the first producer μop based on a comparison between the confidence value of an entry in the memory associated with the first consumer μop and a threshold.