On Sat, 7 Sep 2024 08:51:25 GMT, Shaojin Wen <s...@openjdk.org> wrote:
>> PR #20772 introduced an optimization for writeUTF, which can also be used in
>> DataOutputStream::writeUTF.
>
> Shaojin Wen has updated the pull request incrementally with one additional
> commit since the last revision:
>
> reduce JDKUTF#utflen codeSize
src/java.base/share/classes/java/io/ObjectOutputStream.java line 2014:
> 2012: }
> 2013:
> 2014: void writeUTF(String str, int stroff) throws IOException {
Can we move this to be near `writeUTFInternal` and make this `private` as they
are closely related? This should also be renamed to indicate this is internal,
like `writeMoreUtf` to avoid misuse.
src/java.base/share/classes/jdk/internal/classfile/impl/BufWriterImpl.java line
182:
> 180:
> 181: for (int i = countNonZeroAscii; i < strlen;) {
> 182: offset = JDKUTF.putChar(elems, offset, str.charAt(i++));
Can we put this `++` in for loop instead of the statement here?
src/java.base/share/classes/jdk/internal/util/JDKUTF.java line 35:
> 33: * @since 24
> 34: */
> 35: public abstract class JDKUTF {
Can we name this class `ModifiedUtf`? `JDKUTF` looks like a constant field
name, and this format is part of Java Platform instead of just JDK.
src/java.base/share/classes/jdk/internal/util/JDKUTF.java line 37:
> 35: public abstract class JDKUTF {
> 36: @ForceInline
> 37: public static int putChar(byte[] buf, int offset, char c) {
Do you think we can just move the loop here, like:
public static int putChars(byte[] buf, int offset, String str, int strStart,
int strEnd) {
for (int i = strStart; i < strEnd; i++) {
offset = putChar(buf, offset, str.charAt(i);
}
}
We can even unroll putChar in the loop.
-------------
PR Review Comment: https://git.openjdk.org/jdk/pull/20886#discussion_r1759191218
PR Review Comment: https://git.openjdk.org/jdk/pull/20886#discussion_r1759175406
PR Review Comment: https://git.openjdk.org/jdk/pull/20886#discussion_r1759172395
PR Review Comment: https://git.openjdk.org/jdk/pull/20886#discussion_r1759205885
