Thanks to Franz Puntigam for the values on the 486. Thanks to Dominique de Waleffe for the PentiumPro numbers. Thanks to Thomas Gschwind for the 21164 and the IBM6x86 numbers.
All times are user time.
It fits completely into the respective caches. The older processors are relatively simple and perform quite predictably. For the newer ones, the performance on this benchmark is determined very much by microarchitectural properties like branch target buffers, return stacks, branch mispredict penalties, and cache consistency algorithms. 4MB, and has only one 64KB global data area. Its high clock rate makes the mispredict penalty of 5 cycles bearable.