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8283996: Reduce cost of year and month calculations

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Reviewed-by: bpb, scolebourne, naoto, rriggs
This commit is contained in:
Claes Redestad 2022-03-31 08:45:06 +00:00
parent 45d4d7da23
commit 1a5f5da050
2 changed files with 11 additions and 6 deletions
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8
src/java.base/share/classes/java/time/zone/ZoneRules.java
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@ -974,11 +974,11 @@ public final class ZoneRules implements Serializable {
doyEst = zeroDay - (365 * yearEst + yearEst / 4 - yearEst / 100 + yearEst / 400);
}
yearEst += adjust; // reset any negative year
int marchDoy0 = (int) doyEst;
// convert march-based values back to january-based
int marchMonth0 = (marchDoy0 * 5 + 2) / 153;
yearEst += marchMonth0 / 10;
// convert march-based values back to january-based, adjust year
if (doyEst >= 306) {
yearEst++;
}
// Cap to the max value
return (int)Math.min(yearEst, Year.MAX_VALUE);