p384: const fn field arithmetic
#589
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Uses the `fiat-constify` tool to mechanically transform `fiat-crypto` generated field implementations into `const fn`: https://github.com/RustCrypto/utils/tree/master/fiat-constify Resulting code has been run through `rustfmt` prior to checking it in: rustfmt 1.4.38-stable (fe5b13d6 2022-05-18) The following are criterion benchmarks after the translation. While these values are within the threshold of noise I experience running them on a semi-busy desktop computer (MacBook w\ 2.3 GHz 8-Core Intel Core i9) they do paint a picture of a slight performance regression. field element operations/mul time: [60.361 ns 60.755 ns 61.170 ns] change: [+3.0611% +4.1805% +5.1398%] (p = 0.00 < 0.05) Performance has regressed. field element operations/square time: [59.143 ns 59.508 ns 59.924 ns] change: [+4.8440% +5.5441% +6.2283%] (p = 0.00 < 0.05) Performance has regressed. field element operations/invert time: [49.713 us 50.069 us 50.481 us] change: [+14.227% +15.283% +16.277%] (p = 0.00 < 0.05) Performance has regressed. field element operations/sqrt time: [24.936 us 25.064 us 25.206 us] change: [+3.0874% +3.9261% +4.7805%] (p = 0.00 < 0.05) Performance has regressed. point operations/point-scalar mul time: [532.24 us 535.29 us 538.62 us] change: [+2.4804% +3.2221% +3.9748%] (p = 0.00 < 0.05) Performance has regressed. scalar operations/sub time: [7.1834 ns 7.2272 ns 7.2688 ns] change: [+13.036% +13.817% +14.551%] (p = 0.00 < 0.05) Performance has regressed. scalar operations/add time: [9.5314 ns 9.5797 ns 9.6287 ns] change: [+1.2331% +1.9875% +2.6816%] (p = 0.00 < 0.05) Performance has regressed. scalar operations/mul time: [59.303 ns 59.530 ns 59.779 ns] change: [+5.0340% +5.6533% +6.2711%] (p = 0.00 < 0.05) Performance has regressed. scalar operations/negate time: [6.6648 ns 6.6915 ns 6.7244 ns] change: [+0.1937% +1.0485% +1.8021%] (p = 0.01 < 0.05) Change within noise threshold. scalar operations/invert time: [49.255 us 49.365 us 49.489 us] change: [+12.196% +13.079% +13.937%] (p = 0.00 < 0.05) Performance has regressed.
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Now that #589 is landed, it's possible to add `const fn` implementations of all core field operations, including conersions to/from Montgomery form as well as arithmetic operations: add, double, sub, mul, neg, square
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Uses the
fiat-constifytool to mechanically transformfiat-cryptogenerated field implementations intoconst fn:https://github.com/RustCrypto/utils/tree/master/fiat-constify
Resulting code has been run through
rustfmtprior to checking it in:The following are criterion benchmarks after the translation. While these values are within the threshold of noise I experience running them on a semi-busy desktop computer (MacBook w\ 2.3 GHz 8-Core Intel Core i9) they do paint a picture of a slight performance regression (~5%).
field element operations/mul
time: [60.361 ns 60.755 ns 61.170 ns]
change: [+3.0611% +4.1805% +5.1398%] (p = 0.00 < 0.05)
Performance has regressed.
field element operations/square
time: [59.143 ns 59.508 ns 59.924 ns]
change: [+4.8440% +5.5441% +6.2283%] (p = 0.00 < 0.05)
Performance has regressed.
field element operations/invert
time: [49.713 us 50.069 us 50.481 us]
change: [+14.227% +15.283% +16.277%] (p = 0.00 < 0.05)
Performance has regressed.
field element operations/sqrt
time: [24.936 us 25.064 us 25.206 us]
change: [+3.0874% +3.9261% +4.7805%] (p = 0.00 < 0.05)
Performance has regressed.
point operations/point-scalar mul
time: [532.24 us 535.29 us 538.62 us]
change: [+2.4804% +3.2221% +3.9748%] (p = 0.00 < 0.05)
Performance has regressed.
scalar operations/sub
time: [7.1834 ns 7.2272 ns 7.2688 ns]
change: [+13.036% +13.817% +14.551%] (p = 0.00 < 0.05)
Performance has regressed.
scalar operations/add
time: [9.5314 ns 9.5797 ns 9.6287 ns]
change: [+1.2331% +1.9875% +2.6816%] (p = 0.00 < 0.05)
Performance has regressed.
scalar operations/mul
time: [59.303 ns 59.530 ns 59.779 ns]
change: [+5.0340% +5.6533% +6.2711%] (p = 0.00 < 0.05)
Performance has regressed.
scalar operations/negate
time: [6.6648 ns 6.6915 ns 6.7244 ns]
change: [+0.1937% +1.0485% +1.8021%] (p = 0.01 < 0.05)
Change within noise threshold.
scalar operations/invert
time: [49.255 us 49.365 us 49.489 us]
change: [+12.196% +13.079% +13.937%] (p = 0.00 < 0.05)
Performance has regressed.