RFR: 8315999: Improve Date toString performance [v9]

[温绍锦]

On Tue, 12 Sep 2023 17:53:47 GMT, ExE Boss <duke at openjdk.org> wrote:

>> 温绍锦 has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   merge from master
>
> src/java.base/share/classes/java/time/LocalTime.java line 141:
> 
>> 139:     @Stable
>> 140:     static final int[] DIGITS_K = new int[1000];
>> 141: 
> 
> Suggestion:

DIGITS_K has been removed

> src/java.base/share/classes/java/time/LocalTime.java line 179:
> 
>> 177:             int c3 = i % 10 + '0';
>> 178:             DIGITS_K[i] = c0 + (c1 << 8) + (c2 << 16) + (c3 << 24);
>> 179:         }
> 
> Suggestion:

DIGITS_K has been removed

> src/java.base/share/classes/java/time/LocalTime.java line 1724:
> 
>> 1722:             v = DIGITS_K[rem2];
>> 1723:         } else {
>> 1724:             v = DIGITS_K[div - div2 * 1000];
> 
> Suggestion:
> 
>             v = DecimalDigits.digitTriple(div - div2 * 1000);

DIGITS_K has been removed

> src/java.base/share/classes/java/time/LocalTime.java line 1740:
> 
>> 1738:                     buf,
>> 1739:                     off,
>> 1740:                     DIGITS_K[rem1] & 0xffffff00 | (v >> 24)
> 
> Suggestion:
> 
>                     DecimalDigits.digitTriple(rem1) & 0xffffff00 | (v >> 24)

DIGITS_K has been removed

-------------

PR Review Comment: https://git.openjdk.org/jdk/pull/15658#discussion_r1323811383
PR Review Comment: https://git.openjdk.org/jdk/pull/15658#discussion_r1323811309
PR Review Comment: https://git.openjdk.org/jdk/pull/15658#discussion_r1323811510
PR Review Comment: https://git.openjdk.org/jdk/pull/15658#discussion_r1323811428