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by saagarjha
710 days ago
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> x86 has a different situation. If your instruction generates too many uops (or is too esoteric), it will skip the fast hardware decoders and be sent to a microcode decoder. There’s a massive penalty for doing this that slows performance to a crawl. To my knowledge, no such instructions exist in any modern ISA. Not surprising that modern ISAs are missing legacy instructions |
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