not enough to explain the perf discrepancy. as i explained, both of these values 1/4 and 6 are hideable with proper instruction scheduling. at best author proved that arm gcc sucks at instruction scheduling, which is not news to anyone
Since the wyhash function needs 2 64x64->128 multiplication, you'll need two high and two low muls on ARM, so this is pretty much a dense multiplication benchmark. No amount of scheduling can save you.
Still by my calculation that should only put the ARM chip at a 5x disadvantage in multiplication throughput, but it was nearly 18x slower. Frequency difference probably explains some of that, but not all.