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Did you verify their claims or are you just calling BS and that's it? The new functions are in fact much faster than their C equivalent (and yes, I did verify t
by blux 2y ago
Did you verify their claims or are you just calling BS and that's it? The new functions are in fact much faster than their C equivalent (and yes, I did verify that).
- userbinator 2y agoCare to explain and show the details? "Extraordinary claims require extraordinary evidence."
- j16sdiz 2y agoHow not? It compiles from sources, can be better in-lined, benefits from dead code elimination when you don't use unusual radix. It also don't do locale based things.
- nmeofthestate 2y agoYour original claim "I've not checked but this guy, and by extension the C++ standards committee who worked on this new API, are probably full of shit" was pretty extraordinary.
- userbinator 2y agoLook at the compiler-generated instructions yourself if you don't believe the source that I linked; in the cases I've seen all the extra new stuff just adds another layer on top of existing functions and if the former are faster the latter must necessarily also be. The standards committee's purpose is to justify their own existence by coming up with new stuff all the time. Of course they're going to try to spin it as better in some way.
- blux 2y agoI wrote this library once; https://github.com/ton/fast_int https://github.com/ton/fast_int. Removed `std::atoi` from the benchmarks since it was performing so poorly; not a contender. Should be easy to verify. Rough results (last column is #iterations): BM_fast_int<std::int64_t>/10 1961 ns 1958 ns 355081 BM_fast_int<std::int64_t>/100 2973 ns 2969 ns 233953 BM_fast_int<std::int64_t>/1000 3636 ns 3631 ns 186585 BM_fast_int<std::int64_t>/10000 4314 ns 4309 ns 161831 BM_fast_int<std::int64_t>/100000 5184 ns 5179 ns 136308 BM_fast_int<std::int64_t>/1000000 5867 ns 5859 ns 119398 BM_fast_int_swar<std::int64_t>/10 2235 ns 2232 ns 316949 BM_fast_int_swar<std::int64_t>/100 3446 ns 3441 ns 206437 BM_fast_int_swar<std::int64_t>/1000 3561 ns 3556 ns 197795 BM_fast_int_swar<std::int64_t>/10000 3650 ns 3646 ns 188613 BM_fast_int_swar<std::int64_t>/100000 4248 ns 4243 ns 165313 BM_fast_int_swar<std::int64_t>/1000000 4979 ns 4973 ns 140722 BM_atoi<std::int64_t>/10 10248 ns 10234 ns 69021 BM_atoi<std::int64_t>/100 10996 ns 10985 ns 63810 BM_atoi<std::int64_t>/1000 12238 ns 12225 ns 56556 BM_atoi<std::int64_t>/10000 13606 ns 13589 ns 51645 BM_atoi<std::int64_t>/100000 14984 ns 14964 ns 47046 BM_atoi<std::int64_t>/1000000 16226 ns 16206 ns 43279 BM_from_chars<std::int64_t>/10 2162 ns 2160 ns 302880 BM_from_chars<std::int64_t>/100 2410 ns 2407 ns 282778 BM_from_chars<std::int64_t>/1000 3309 ns 3306 ns 208070 BM_from_chars<std::int64_t>/10000 5034 ns 5028 ns 100000 BM_from_chars<std::int64_t>/100000 6282 ns 6275 ns 107023 BM_from_chars<std::int64_t>/1000000 7267 ns 7259 ns 96114 BM_fast_float<std::int64_t>/10 2670 ns 2666 ns 262721 BM_fast_float<std::int64_t>/100 3547 ns 3542 ns 196704 BM_fast_float<std::int64_t>/1000 4643 ns 4638 ns 154391 BM_fast_float<std::int64_t>/10000 5056 ns 5050 ns 132722 BM_fast_float<std::int64_t>/100000 6207 ns 6200 ns 111565 BM_fast_float<std::int64_t>/1000000 7113 ns 7105 ns 98847