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8205528: Base64 encoding algorithm using AVX512 instructions

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Reviewed-by: kvn, psandoz
This commit is contained in:
Smita Kamath 2018-06-27 20:21:42 -07:00 • committed by Vladimir Kozlov
parent a937d2876b
commit 3feaefd75f
28 changed files with 1851 additions and 23 deletions
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25
src/java.base/share/classes/java/util/Base64.java
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@ -31,6 +31,7 @@ import java.io.IOException;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import java.nio.charset.StandardCharsets;
import jdk.internal.HotSpotIntrinsicCandidate;
/**
* This class consists exclusively of static methods for obtaining
@ -390,6 +391,20 @@ public class Base64 {
return new Encoder(isURL, newline, linemax, false);
}
@HotSpotIntrinsicCandidate
private void encodeBlock(byte[] src, int sp, int sl, byte[] dst, int dp, boolean isURL) {
char[] base64 = isURL ? toBase64URL : toBase64;
for (int sp0 = sp, dp0 = dp ; sp0 < sl; ) {
int bits = (src[sp0++] & 0xff) << 16 |
(src[sp0++] & 0xff) << 8 |
(src[sp0++] & 0xff);
dst[dp0++] = (byte)base64[(bits >>> 18) & 0x3f];
dst[dp0++] = (byte)base64[(bits >>> 12) & 0x3f];
dst[dp0++] = (byte)base64[(bits >>> 6) & 0x3f];
dst[dp0++] = (byte)base64[bits & 0x3f];
}
}
private int encode0(byte[] src, int off, int end, byte[] dst) {
char[] base64 = isURL ? toBase64URL : toBase64;
int sp = off;
@ -400,15 +415,7 @@ public class Base64 {
int dp = 0;
while (sp < sl) {
int sl0 = Math.min(sp + slen, sl);
for (int sp0 = sp, dp0 = dp ; sp0 < sl0; ) {
int bits = (src[sp0++] & 0xff) << 16 |
(src[sp0++] & 0xff) << 8 |
(src[sp0++] & 0xff);
dst[dp0++] = (byte)base64[(bits >>> 18) & 0x3f];
dst[dp0++] = (byte)base64[(bits >>> 12) & 0x3f];
dst[dp0++] = (byte)base64[(bits >>> 6) & 0x3f];
dst[dp0++] = (byte)base64[bits & 0x3f];
}
encodeBlock(src, sp, sl0, dst, dp, isURL);
int dlen = (sl0 - sp) / 3 * 4;
dp += dlen;
sp = sl0;