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8006799: Optimize sun.nio.cs.ISO_8859_1$Encode.encodeArrayLoop() (jdk part of 6896617)

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Move hot loop in ISO_8859_1$Encode.encodeArrayLoop() into separate method encodeISOArray() to be replaced by JVM JIT compiler with optimized intrinsic code.

Reviewed-by: alanb, sherman
This commit is contained in:
Vladimir Kozlov 2013-01-23 11:47:07 -08:00
parent fb60d01e36
commit f1cf6ff588
1 changed files with 49 additions and 30 deletions
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79
jdk/src/share/classes/sun/nio/cs/ISO_8859_1.java
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2000, 2004, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2000, 2013, 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
@ -147,37 +147,53 @@ class ISO_8859_1
private final Surrogate.Parser sgp = new Surrogate.Parser();
// JVM may replace this method with intrinsic code.
private static int encodeISOArray(char[] sa, int sp,
byte[] da, int dp, int len)
{
int i = 0;
for (; i < len; i++) {
char c = sa[sp++];
if (c > '\u00FF')
break;
da[dp++] = (byte)c;
}
return i;
}
private CoderResult encodeArrayLoop(CharBuffer src,
ByteBuffer dst)
{
char[] sa = src.array();
int sp = src.arrayOffset() + src.position();
int sl = src.arrayOffset() + src.limit();
int soff = src.arrayOffset();
int sp = soff + src.position();
int sl = soff + src.limit();
assert (sp <= sl);
sp = (sp <= sl ? sp : sl);
byte[] da = dst.array();
int dp = dst.arrayOffset() + dst.position();
int dl = dst.arrayOffset() + dst.limit();
int doff = dst.arrayOffset();
int dp = doff + dst.position();
int dl = doff + dst.limit();
assert (dp <= dl);
dp = (dp <= dl ? dp : dl);
int dlen = dl - dp;
int slen = sl - sp;
int len = (dlen < slen) ? dlen : slen;
try {
while (sp < sl) {
char c = sa[sp];
if (c <= '\u00FF') {
if (dp >= dl)
return CoderResult.OVERFLOW;
da[dp++] = (byte)c;
sp++;
continue;
}
if (sgp.parse(c, sa, sp, sl) < 0)
int ret = encodeISOArray(sa, sp, da, dp, len);
sp = sp + ret;
dp = dp + ret;
if (ret != len) {
if (sgp.parse(sa[sp], sa, sp, sl) < 0)
return sgp.error();
return sgp.unmappableResult();
}
if (len < slen)
return CoderResult.OVERFLOW;
return CoderResult.UNDERFLOW;
} finally {
src.position(sp - src.arrayOffset());
dst.position(dp - dst.arrayOffset());
src.position(sp - soff);
dst.position(dp - doff);
}
}
@ -221,22 +237,25 @@ class ISO_8859_1
public int encode(char[] src, int sp, int len, byte[] dst) {
int dp = 0;
int sl = sp + Math.min(len, dst.length);
int slen = Math.min(len, dst.length);
int sl = sp + slen;
while (sp < sl) {
char c = src[sp++];
if (c <= '\u00FF') {
dst[dp++] = (byte)c;
continue;
}
if (Character.isHighSurrogate(c) && sp < sl &&
Character.isLowSurrogate(src[sp])) {
if (len > dst.length) {
sl++;
len--;
int ret = encodeISOArray(src, sp, dst, dp, slen);
sp = sp + ret;
dp = dp + ret;
if (ret != slen) {
char c = src[sp++];
if (Character.isHighSurrogate(c) && sp < sl &&
Character.isLowSurrogate(src[sp])) {
if (len > dst.length) {
sl++;
len--;
}
sp++;
}
sp++;
dst[dp++] = repl;
slen = Math.min((sl - sp), (dst.length - dp));
}
dst[dp++] = repl;
}
return dp;
}