Accelerated reversal of speculative state changes and resource recovery

A processing device, comprising:

• a retire queue to store entries for instructions that are awaiting retirement;
• and
• a finite state machine to interrupt dispatch of instructions in response to a flush of speculative instructions previously dispatched for execution in the processing device and to undo, in reverse program order, changes in a state of the processing device caused by the speculative instructions while concurrently deallocating resources previously allocated to the speculative instructions.

A non-transitory computer readable medium embodying a set of executable instructions, the set of executable instructions to manipulate a computer system to perform a portion of a process to fabricate at least part of a semiconductor device, the semiconductor device comprising:

• a retire queue to store entries for instructions that are awaiting retirement;
• and
• a finite state machine to interrupt dispatch of instructions in response to a flush of speculative instructions previously dispatched for execution in the processing device and undo, in reverse program order, changes in a state of the processing device caused by the speculative instructions while concurrently deallocating resources previously allocated to the speculative instructions.