RFR 8057793 BigDecimal is no longer effectively immutable

Brian Burkhalter brian.burkhalter at oracle.com
Mon Sep 15 20:18:42 UTC 2014

Hi Robert,

On Sep 15, 2014, at 2:09 AM, Robert Gibson <robbiexgibson at yahoo.com> wrote:

> How are the performance characteristics after the patch?

I have not tested that aspect as yet but clearly it should be evaluated. Given that JDK-8057793 causes a violation of the specification of BigDecimal I thought it was important to check in the fix as-is without further delay.

> I see that a lot of effort went in to tuning last December under 8029501.

Yes, that was a fair bit of work.

> By the way, as part of my investigations into this bug I noticed that BigIntegerTest::divideLarge no longer tests the Burnikel-Ziegler part of the division code, since the heuristic to decide Knuth or BZ diverged from the algorithm to generate the test cases (as part of 8029501). 

I created https://bugs.openjdk.java.net/browse/JDK-8058505 for this problem.



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