[Lilypond-auto] [LilyIssues-auto] [testlilyissues:issues] #5897 rational: optimize comparison

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Passes make, make check and a full make doc

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[issues:#5897] rational: optimize comparison

Status: Started
Created: Sun Apr 12, 2020 04:03 PM UTC by Han-Wen Nienhuys
Last Updated: Sun Apr 12, 2020 04:03 PM UTC
Owner: Han-Wen Nienhuys

calculating sign(left-right) is correct, but requires an unnecessary
GCD calculation to normalize the result.

Rational::compare takes about 1% of cumulative time in the carver MDSM
profile

https://codereview.appspot.com/559820044

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