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  • This looks like something that every serious C++ programmer should be reading.
    by zombot
  • C++ CPUs?
    by notorandit
  • Virtual functions cost a lot less here than I expected.
    by Blackthorn
  • If you read this, you should be able to get a job at Jane Street
    by brcmthrowaway
  • Screen refresh vertical rate in Hz. C++ negative right.
    by hxnrye
  • I'm somewhat dubious about anything talking about low level performance programming at the instruction level that doesn't distinguish between latency and throughput, never mind mention the incredibly out-of-order nature of modern desktop/server class CPU cores.
    by owlbite
  • what if a language would allow to elegantly pack Optional values?

    so the physical layout has a bit vector with one bit for each optional. and a popcnt over that bitvector (masked up to the value we're interested in) will give the actual slot to look into?

    would also make sense to reorder / bucket fields by (byte) size

    if you want to do that in any low level language (rust, c++) you have to deviate from their standard syntax for optionals, and you have to manually keep track of slot order. but for domains with many optional/default values, this amy really reduce cache pressure, no?

    In higher level languages you can fake the effect (with flyweight facades), so from python such a packed "dataclass"-like class can look neat and clean. however at the low level there is no abstraction that allows to create your own data layout.

    at least I didn't find anything yet.

    by froh
  • Article title should be "Efficient C++ Programming for Modern 64-bit CPUs...".
    by egl2020

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