Just wrote this mail on "fun" AVX issues, might be of general interest https://gist.github.com/rygorous/32bc3ea8301dba09358fd2c64e02d774 … TL;DR: VEX encoding and new 128b instrs are reasonably easy to deploy (other than build issues), 256b+ vector stuff is _hard_ to ship for libs due to power management.
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Replying to @rygorous
cloudflare wrote a blogpost some time ago on how a crypto library's use of AVX slowed down the rest of the workload:https://blog.cloudflare.com/on-the-dangers-of-intels-frequency-scaling/ …
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