The question at the end - what is the highest value of pi that is playable (doesn't crash). I'm suspecting that when pi is 4, it segfaults because some accesses

The question at the end - what is the highest value of pi that is playable (doesn't crash). I'm suspecting that when pi is 4, it segfaults because some accesses to the lookup table fall off the end of the lookup table, and therefore the highest value of pi that will be playable is likely to be a very small amount higher than pi itself.