65 lines
2.5 KiB
Diff
65 lines
2.5 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: astei <andrew@steinborn.me>
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Date: Tue, 30 Nov 2021 19:39:21 +0100
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Subject: [PATCH] PaperPR Optimize VarInts
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diff --git a/src/main/java/net/minecraft/network/FriendlyByteBuf.java b/src/main/java/net/minecraft/network/FriendlyByteBuf.java
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index 896a4237f871d46cf39b0721e909c2cc3b5fc728..e2a0a7fd5afd8cd3467dab049695956c381fb3cd 100644
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--- a/src/main/java/net/minecraft/network/FriendlyByteBuf.java
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+++ b/src/main/java/net/minecraft/network/FriendlyByteBuf.java
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@@ -65,19 +65,22 @@ public class FriendlyByteBuf extends ByteBuf {
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public java.util.Locale adventure$locale; // Paper
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public static final short MAX_STRING_LENGTH = 32767;
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public static final int MAX_COMPONENT_STRING_LENGTH = 262144;
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+ // Paper start - Optimize VarInts
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+ private static final int[] VARINT_EXACT_BYTE_LENGTHS = new int[33];
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+ static {
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+ for (int i = 0; i <= 32; ++i) {
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+ VARINT_EXACT_BYTE_LENGTHS[i] = (int) Math.ceil((31d - (i - 1)) / 7d);
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+ }
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+ VARINT_EXACT_BYTE_LENGTHS[32] = 1; // Special case for the number 0.
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+ }
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+ // Paper end - Optimize VarInts
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public FriendlyByteBuf(ByteBuf parent) {
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this.source = parent;
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}
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public static int getVarIntSize(int value) {
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- for (int j = 1; j < 5; ++j) {
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- if ((value & -1 << j * 7) == 0) {
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- return j;
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- }
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- }
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-
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- return 5;
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+ return VARINT_EXACT_BYTE_LENGTHS[Integer.numberOfLeadingZeros(value)]; // Paper - Optimize VarInts
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}
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public static int getVarLongSize(long value) {
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@@ -420,7 +423,23 @@ public class FriendlyByteBuf extends ByteBuf {
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return new UUID(this.readLong(), this.readLong());
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}
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+ // Paper start - Optimize VarInts
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public FriendlyByteBuf writeVarInt(int value) {
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+ // Peel the one and two byte count cases explicitly as they are the most common VarInt sizes
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+ // that the proxy will write, to improve inlining.
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+ if ((value & (0xFFFFFFFF << 7)) == 0) {
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+ writeByte(value);
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+ } else if ((value & (0xFFFFFFFF << 14)) == 0) {
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+ int w = (value & 0x7F | 0x80) << 8 | (value >>> 7);
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+ writeShort(w);
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+ } else {
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+ writeVarInt_(value);
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+ }
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+ return this;
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+ }
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+
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+ public FriendlyByteBuf writeVarInt_(int value) {
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+ // Paper end - Optimize VarInts
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while ((value & -128) != 0) {
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this.writeByte(value & 127 | 128);
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value >>>= 7;
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