ALEXANDRIA, Va., June 19 -- United States Patent no. 12,332,799, issued on June 17, was assigned to SiFive Inc. (Santa Clara, Calif.).
"Speculative request indicator in request message" was invented by Wesley Waylon Terpstra (San Mateo, Calif.), Eric Andrew Gouldey (Fort Collins, Colo.), Michael Klinglesmith (Chambery, France) and Henry Cook (Berkeley, Calif.).
According to the abstract* released by the U.S. Patent & Trademark Office: "A method and apparatus for a speculative request indicator is described. A method includes providing, for a cache hierarchy, a messaging protocol used for transfer operations among agents in the cache hierarchy, the messaging protocol indicating acceptable cache coherency states for a cache block indicated ...