One day, it will be cheaper to calculate "(1 << x) - 1" in bit IO code rather than tabulating it. That day is not yet here.
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@cmuratori@rygorous@McCloudStrife Historically common too. One of the few successful optimizations we got from Intel on the IGJ0 codebase. -
@nothings@cmuratori@McCloudStrife I would assume that on Haswell and later SHLX + sub wins, but yeah (or something BEXTR-based, even). - Show replies
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