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8282664: Unroll by hand StringUTF16 and StringLatin1 polynomial hash loops

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Co-authored-by: Sandhya Viswanathan <sviswanathan@openjdk.org>
Co-authored-by: Ludovic Henry <luhenry@openjdk.org>
Co-authored-by: Claes Redestad <redestad@openjdk.org>
Reviewed-by: vlivanov, sviswanathan, luhenry
This commit is contained in:
Claes Redestad 2023-01-17 21:06:22 +00:00
parent ade08e190c
commit e37078f5bb
33 changed files with 1053 additions and 87 deletions
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13
src/java.base/share/classes/java/lang/StringUTF16.java
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2015, 2021, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2015, 2023, 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
@ -412,12 +412,11 @@ final class StringUTF16 {
}
public static int hashCode(byte[] value) {
int h = 0;
int length = value.length >> 1;
for (int i = 0; i < length; i++) {
h = 31 * h + getChar(value, i);
}
return h;
return switch (value.length) {
case 0 -> 0;
case 2 -> getChar(value, 0);
default -> ArraysSupport.vectorizedHashCode(value, 0, value.length >> 1, 0, ArraysSupport.T_CHAR);
};
}
public static int indexOf(byte[] value, int ch, int fromIndex) {