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Speed up GcdInt, PValuation, SmallestRootInt, IsPrimePowerInt #2086

Merged
merged 4 commits into from
Jan 15, 2018
Merged

Speed up GcdInt, PValuation, SmallestRootInt, IsPrimePowerInt #2086

merged 4 commits into from
Jan 15, 2018

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fingolfin
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This PR contains the non-controversial subset of PR #2061, i.e. it drops the RootInt kernel rewrite, and some subsequent tweaks.

I hope this can be merged ASAP, after which I'd rebase PR #2061.

@fingolfin
kernel: optimize GcdInt for small inputs
6a635c9 
This gives perhaps 5-8% improvement for me. Not much,
but worthwhile.
@fingolfin
kernel: optimize PVALUATION_INT for small inputs
8bf97a8 
Before:

gap> SumX([-100000 .. 100000], [-5,2,3,5,7,251,256], PVALUATION_INT);; time;
615

After:

gap> SumX([-100000 .. 100000], [-5,2,3,5,7,251,256], PVALUATION_INT);; time;
327
@fingolfin
Optimize SmallestRootInt
3563e60 
Also correct a comment which claimed Euler's criterion was used,
but it is actually Fermat's little theorem.
@fingolfin
Optimize IsPrimePowerInt (speed up 10x)
9021830 
Before:
gap> Number([-100000..100000], IsPrimePowerInt);; time;
1753

After:
gap> Number([-100000..100000], IsPrimePowerInt);; time;
168
@fingolfin fingolfin added kind: enhancement Label for issues suggesting enhancements; and for pull requests implementing enhancements topic: performance bugs or enhancements related to performance (improvements or regressions) topic: kernel labels Jan 13, 2018
@fingolfin fingolfin mentioned this pull request Jan 13, 2018
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@ChrisJefferson ChrisJefferson merged commit 286b995 into gap-system:master Jan 15, 2018
@fingolfin fingolfin deleted the mh/integer branch January 15, 2018 15:10
@fingolfin fingolfin mentioned this pull request Jan 15, 2018
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@olexandr-konovalov olexandr-konovalov added this to the GAP 4.10.0 milestone Jan 22, 2018
@olexandr-konovalov olexandr-konovalov added the release notes: added PRs introducing changes that have since been mentioned in the release notes label Jan 29, 2018
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olexandr-konovalov commented Jan 29, 2018 •
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Added to release notes for GAP 4.10 at https://github.com/gap-system/gap/wiki/GAP-4.10-release-notes

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@ChrisJefferson ChrisJefferson ChrisJefferson approved these changes

@stevelinton stevelinton Awaiting requested review from stevelinton

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@fingolfin @olexandr-konovalov @ChrisJefferson