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Hey, OP here. Code not written by me, but by a friend (iscgar) with no HN account.

On my late 2019 MacBook Pro, using clang 12.

    clang -O3 -march=native fizz4.c
    ./a.out | pv > /dev/null
Starts at around 4GiB/s and drops down to 3.8 after a while, probably due to battery/heating.