f4ada1b42f
The macro variants can be used in static initializers. The same guard against calling __builtin_clz(0) is added as for __builtin_clzll(0), since that's undefined behaviour too. Our code wouldn't call it, but this avoids a potential pitfall with the macro. All variants map 0→0. Otherwise we'd often have to handle 0 specially in callers. __builtin_clz takes unsigned as the argument, so there's no LOG2I macro.
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