RFR: 8327791: Optimization for new BigDecimal(String) [v16]

[Claes Redestad]

On Wed, 20 Mar 2024 22:56:38 GMT, Shaojin Wen <duke at openjdk.org> wrote:

>> The current BigDecimal(String) constructor calls String#toCharArray, which has a memory allocation.
>> 
>> 
>> public BigDecimal(String val) {
>>     this(val.toCharArray(), 0, val.length()); // allocate char[]
>> }
>> 
>> 
>> When the length is greater than 18, create a char[]
>> 
>> 
>> boolean isCompact = (len <= MAX_COMPACT_DIGITS); // 18
>> if (!isCompact) {
>>     // ...
>> } else {
>>     char[] coeff = new char[len]; // allocate char[]
>>     // ...
>> }
>> 
>> 
>> This PR eliminates the two memory allocations mentioned above, resulting in an approximate 60% increase in performance..
>
> Shaojin Wen has updated the pull request incrementally with one additional commit since the last revision:
> 
>   use while instead for

I agree that a public `BigDecimal(CharSequence, ...)` constructor (or set of constructors) should be considered out of scope here. I think the bar is higher on such a change, too, but I'm not ruling out that such an addition would make the cut.

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PR Comment: https://git.openjdk.org/jdk/pull/18177#issuecomment-2020156038