Apple kicked off the week by announcing the iPhone 17e and M4 iPad Air on Monday. The new MacBook Pros it unveiled Tuesday alongside the Airs have upgraded M5 Pro and M5 Max chips.
Because results with NOPs were inconclusive, I tried testing with combinations of various instructions designed to dodge other resource limits. Mixing instructions that write to the integer and floating point registers showed X925 could have a maximum of 448 renamed registers allocated across its register files. Recognized zeroing idioms like MOV r,0 do not allocate an integer register, but also run up against the 448 instruction limit. I tried mixing in predicate register writes, but those also share the 448 instruction limit. Adding in stores showed the core could have slightly more than 525 instructions in flight. Adding in not-taken branches did not increase reordering capacity further. Putting an exact number on X925’s reorder buffer capacity is therefore difficult, but it’s safe to say there’s a practical limitation of around 525 instructions in flight. That puts it in the same neighborhood as Intel’s Lion Cove (576) and ahead of AMD’s Zen 5 (448).
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