RFR: 8283892: Compress and expand bits [v2]

[Paul Sandoz]

On Wed, 6 Apr 2022 17:39:48 GMT, John R Rose <jrose at openjdk.org> wrote:

>> Paul Sandoz has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Doc and test updates.
>
> test/jdk/java/lang/AbstractCompressExpandTest.java line 145:
> 
>> 143: 
>> 144:         int i = 0;
>> 145:         for (int len = 0; len < 32; len++) {
> 
> Lengths should be `len = 1; len <= 32; len++`, generating fewer redundant zero-length masks and a full-length -1 mask.  The pos should be `pos = 0; pos <= 32 - len; pos++`, generating fully left-justified masks of the form `-1<<pos`.
> 
> Also, you should generate a zero-mask, just once.  I think initializing `int i = 1` will do that trick.
> 
> (Same comment in two places.)

Done.

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PR: https://git.openjdk.java.net/jdk/pull/8115