Hi, Xcode seems to think that [some] builtins can be used from Swift. It autocompletes popcount for example, and command-clicking the function opens a bona fide interface file, with the following declaration (among others):
public func __builtin_popcount(_: UInt32) -> Int32 However, when I try to compile code that uses that function, I get an unresolved identifier compiler error. I guess I need to import some module, but which one? Generally speaking, how to find in which module some symbol is defined? Thanks, Jean-Denis
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