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8310502: Optimization for j.l.Long.fastUUID()

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Reviewed-by: liach, alanb
This commit is contained in:
shaojin.wensj 2023-06-29 13:37:32 +00:00 • committed by Jie Fu
parent 07734f6dde
commit 20f7d05ef2
5 changed files with 96 additions and 43 deletions
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33
src/java.base/share/classes/java/lang/Long.java
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@ -445,39 +445,6 @@ public final class Long extends Number
} while (charPos > offset);
}
static String fastUUID(long lsb, long msb) {
if (COMPACT_STRINGS) {
byte[] buf = new byte[36];
formatUnsignedLong0(lsb, 4, buf, 24, 12);
formatUnsignedLong0(lsb >>> 48, 4, buf, 19, 4);
formatUnsignedLong0(msb, 4, buf, 14, 4);
formatUnsignedLong0(msb >>> 16, 4, buf, 9, 4);
formatUnsignedLong0(msb >>> 32, 4, buf, 0, 8);
buf[23] = '-';
buf[18] = '-';
buf[13] = '-';
buf[8] = '-';
return new String(buf, LATIN1);
} else {
byte[] buf = new byte[72];
formatUnsignedLong0UTF16(lsb, 4, buf, 24, 12);
formatUnsignedLong0UTF16(lsb >>> 48, 4, buf, 19, 4);
formatUnsignedLong0UTF16(msb, 4, buf, 14, 4);
formatUnsignedLong0UTF16(msb >>> 16, 4, buf, 9, 4);
formatUnsignedLong0UTF16(msb >>> 32, 4, buf, 0, 8);
StringUTF16.putChar(buf, 23, '-');
StringUTF16.putChar(buf, 18, '-');
StringUTF16.putChar(buf, 13, '-');
StringUTF16.putChar(buf, 8, '-');
return new String(buf, UTF16);
}
}
/**
* Returns a {@code String} object representing the specified
* {@code long}. The argument is converted to signed decimal