On Wed, 20 Mar 2024 22:56:38 GMT, Shaojin Wen <d...@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
Should we declare the BigDecimal(CharSequence,MathContext) method as public?
Scenarios like
[MysqlBinaryValueDecoder#decodeDecimal](https://github.com/mysql/mysql-connector-j/blob/release/8.x/src/main/protocol-impl/java/com/mysql/cj/protocol/a/MysqlBinaryValueDecoder.java#L275)
can be used to avoid a memory allocation.
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PR Comment: https://git.openjdk.org/jdk/pull/18177#issuecomment-2010977844
