Niles Salter ff5850183e [priority_deque] simplify & optimize isMinLayer ...

LLVM has trouble compiling the old implementation, (presumably) because `leading_zeros` is thought to be a `u7` rather than a `u6`, which means `63 - clz` is not equivalent to `63 ^ clz`, which means it can't deduce that the final condition can simply be flipped. (I am assuming `usize` is a `u64` here for ease of understanding, but it's the same for any power of 2)

https://zig.godbolt.org/z/Pbj4P7ob3

The new version is slightly better too because `isMinLayer(maxInt(usize))` is now well-defined behavior.

2023-06-22 01:57:28 -07:00

33 KiB

Raw Blame History

View Raw