perf: faster GLV scalar decomposition #213
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gbotrel
approved these changes
Jun 22, 2022
ThomasPiellard
approved these changes
Jun 22, 2022
Merged
This was referenced Jun 27, 2024
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This replaces the Babai rounding at runtime in
SplitScalar()by a right-shift. We precomputeb=2^m*v/d(m > log2(d)) and then at runtime computescalar*b/2^m. This increases the bounds on sub-scalars by 1 which we check at runtime before increasing the loop size (we don't target constant-timeness).mis chosen to be a machine word twice big thanlog2(d)so that we rarely increase the loop size.