Make ProjectiveNielsPoint::identity() an associated constant
#1330
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daxpedda
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ProjectiveNielsPoint::identity() and associated constantProjectiveNielsPoint::identity() an associated constant
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tarcieri
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Sep 2, 2025
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This PR makes
ProjectiveNielsPoint::identity()and associated constantIDENTITY.This actually had quite the effect on Edwards scalar multiplication, it called the twisted-curve to Niel's form conversion 113 times during the operation which isn't being optimized away in release mode (with fat LTO,
codegen-units = 1and such). So during each iteration this added 3 multiplications to the already 20 present, a flat 15% increase. Which approximately matches the benchmarks I've run.Also affects Decaf scalar multiplication with #1303.