Counting Leading Zeros in C: GCC Built-ins and MSVC Alternatives
When evaluating __builtin_clz with an input of 0, the output often matches the result of passing 1 (yielding 31 on a 32-bit integer), which seems counterintuitive. According to the GCC documentation, the result of __builtin_clz is explicitly undefined when the input is 0: Returns the number of leadi...