Data cache block zero implementation

A method comprising:

• executing a speculative data cache block write operation in a processor;
• issuing a first transaction on an interconnect to which the processor is coupled in response to the speculative data cache block write operation;
• determining a state of a block affected by the data cache block write operation responsive to one or more responses to the first transaction;
• determining that the speculative data cache block write operation has become non-speculative;
• and
• completing the non-speculative data cache block write operation without additional communication on the interconnect responsive to the state of the block being invalid.

A method comprising:

• executing a speculative data cache block write operation in a processor;
• issuing a probe on an interconnect to which the processor is coupled responsive to the speculative data cache block write operation;
• receiving a probe response in the processor indicating that a block affected by the data cache block write operation is invalid in other caching agents coupled to the interconnect;
• and
• completing the speculative data cache block write operation in response to determining that the speculative data cache block write operation is becoming non-speculative and responsive to the block being invalid in the other cache agents, wherein the completing occurs without additional communication on the interconnect after the probe.