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8279833: Loop optimization issue in String.encodeUTF8_UTF16

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Reviewed-by: shade, alanb
This commit is contained in:
Claes Redestad 2022-01-11 14:49:03 +00:00
parent 9e0244762c
commit c3d0a94040
2 changed files with 89 additions and 48 deletions
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11
src/java.base/share/classes/java/lang/String.java
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@ -1,5 +1,5 @@
/*
* Copyright (c) 1994, 2021, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 1994, 2022, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -1284,14 +1284,17 @@ public final class String
int sp = 0;
int sl = val.length >> 1;
byte[] dst = new byte[sl * 3];
char c;
while (sp < sl && (c = StringUTF16.getChar(val, sp)) < '\u0080') {
while (sp < sl) {
// ascii fast loop;
char c = StringUTF16.getChar(val, sp);
if (c >= '\u0080') {
break;
}
dst[dp++] = (byte)c;
sp++;
}
while (sp < sl) {
c = StringUTF16.getChar(val, sp++);
char c = StringUTF16.getChar(val, sp++);
if (c < 0x80) {
dst[dp++] = (byte)c;
} else if (c < 0x800) {