Enabling and disabling a second jump execution unit for branch misprediction

A processor comprising:

• a first jump execution unit (JEU) to evaluate a first branch operation for a first branch mispredict;
• a counter to count a number of branch operations evaluated by the first JEU;
• and
• a second JEU that is activated at least partly based on the counted number of branch operations, the second JEU activated to evaluate a second branch operation for a second branch mispredict during a same instruction cycle as the first JEU evaluates the first branch operation.

A method comprising:

• resolving a first branch by a primary jump execution unit (JEU) of a processor;
• decrementing a pressure count by a decay value during each of a plurality of instruction cycles;
• incrementing the pressure count by an increment value during each of the plurality of instruction cycles in which a branch operation is detected;
• and
• activating a secondary JEU of the processor to operate in parallel with the primary JEU based on the pressure count exceeding an activation threshold value, the secondary JEU activated to resolve a second branch during a same instruction cycle as the primary JEU resolves the first branch.

A method comprising:

• resolving a first branch by a primary jump execution unit (JEU) of a processor;
• incrementing a confidence count by an increment value, for each correctly predicted branch operation;
• decrementing the confidence count by a decrement value, for each incorrectly predicted branch operation;
• and
• activating a secondary jump execution unit (JEU) of the processor to operate in parallel with the primary JEU based on the confidence count exceeding an activation threshold value, the secondary JEU activated to resolve a second branch during a same instruction cycle as the primary JEU resolves the first branch.

A system comprising:

• at least one processing unit including:
• a first jump execution unit (JEU) for branch operation evaluation;
• a second JEU for branch operation evaluation;
• and
• an activation component to activate the second JEU based at least partly on detected branch operations of the first JEU, the second JEU activated to operate in parallel with the first JEU.