arithmetic: Rewrite limbs_reduce_once. #2283
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Codecov ReportAll modified and coverable lines are covered by tests ✅
Additional details and impacted files@@ Coverage Diff @@
## main #2283 +/- ##
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+ Coverage 96.60% 96.62% +0.01%
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Files 176 177 +1
Lines 21640 21670 +30
Branches 529 529
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+ Hits 20906 20939 +33
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Move the function to `arithmetic` from `limb`. This is step towards moving all arithmetic out of `limb`. Change the signature so that the reduction is done separately instead of in-place. It was already being done separately in `bigint` and it costs very little, if anything, to do the same in the other caller in `ec`. Optimize the implementation to take advantage of the fact that `r` and `a` do not alias each other. To do so, replace `LIMBS_reduce_once` with two separate helper functions, `LIMBS_sub` and `LIMBS_cmov`. As part of doing this, ensure we're not passing any empty slices to the relevant C code.
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