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on July 3, 2017
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I found a bug in Intel Skylake processors
Those "decades of cruft" are usually emulated in microcode and not actual silicon. Intel knows very few people use the BCD instructions, but it costs them almost nothing to keep them in while running them slightly slower than most operations.
Why mess up a stable API when you don't have to?
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Why mess up a stable API when you don't have to?