Can you get into direct contact with AMD engineers to tell them your findings? Is hard to believe that a errata fix for around the size of Barcelona TLB bug or P5 x87 wasn't fixed in two entire generations.

More interesing will be your fix. I'm expecting a run-every-boot application that changes some bit in a internal register that makes Bulldozer x87 to disregard the time-consuming workaround. Do you expect that it would be included as a fix via microcode in newer BIOS upgrades? Besides, can you guess what it was supposed to fix?