arithmetic: Rewrite limbs_reduce_once.
#2435
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #2435 +/- ##
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Coverage 96.57% 96.58%
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Lines 21607 21653 +46
Branches 533 533
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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. ``` git difftool HEAD^1:src/limb.rs src/arithmetic/limbs/reduce_once.rs ```
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Move the function to
arithmeticfromlimb. This is step towards moving all arithmetic out oflimb.Change the signature so that the reduction is done separately instead of in-place. It was already being done separately in
bigintand it costs very little, if anything, to do the same in the other caller inec.Optimize the implementation to take advantage of the fact that
randado not alias each other. To do so, replaceLIMBS_reduce_oncewith two separate helper functions,LIMBS_subandLIMBS_cmov.As part of doing this, ensure we're not passing any empty slices to the relevant C code.