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by loeg
267 days ago
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The actual intrinsic is like 8-9 cycles on Zen4 or Ice Lake (vs 1 for plain add). It's something if you're banging on it in a hot loop, but otherwise not a ton. (If refcounting is hot in your design, your design is bad.) It's comparable to like, two integer multiplies, or a single integer division. Yes, there is some effect on program order. |
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