RFR : 8007398 : (S) Performance improvements for Int/Long toString() at Radix 2, 8, 16
joe.darcy at oracle.com
Thu May 16 02:09:34 UTC 2013
Looks fine. Are you satisfied with the test coverage provided by the
existing regression tests?
On 5/15/2013 6:17 PM, Mike Duigou wrote:
> Hello all;
> This issue was originally part of JDK-8006627 (improve performance of UUID parsing/formatting) but was split out because it could be split out. I've been working incrementally on pieces of 8006627 as my time permits.
> I've done microbenchmarking of using digits table vs calculating digits, previously mentioned in <http://mail.openjdk.java.net/pipermail/core-libs-dev/2013-April/016526.html>, and found that using the digits table was still faster.
> I've also benchmarked removing the offset param from formatUnsignedLong() and simplifying the loop termination logic but neither of these turned out to have little benefit.
> Since the last rev I have made a separate implementation Integer.formatUnsignedInteger for use by Integer rather than sharing the Long implementation because it's about 30% faster. I suspect the benefits would be even greater on a 32-bit VM or 32-bit native platform.
> We'll get back to 8006627 soon enough. (I have been tempted to split it again into parsing and formatting).
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