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DivineMC/divinemc-server/minecraft-patches/features/0032-Optimize-VarInt-and-VarLong-write.patch
NONPLAYT 275de5a367 apply a lot of patches
2025-10-11 01:35:35 +03:00

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: NONPLAYT <76615486+NONPLAYT@users.noreply.github.com>
Date: Wed, 9 Jul 2025 02:08:35 +0300
Subject: [PATCH] Optimize VarInt and VarLong write
This patch is based on the following commit:
"Reapply "Optimize varint writing""
By: Andrew Steinborn <git@steinborn.me>
As part of: Velocity (https://github.com/PaperMC/Velocity)
Licensed under: GPL-3.0 (https://www.gnu.org/licenses/gpl-3.0.html)
diff --git a/net/minecraft/network/VarInt.java b/net/minecraft/network/VarInt.java
index 7a1cafc3fb56054a72591bfb446a433f959a6b28..9bbec7288734899d0b08d0ef2061f0d3c6f265be 100644
--- a/net/minecraft/network/VarInt.java
+++ b/net/minecraft/network/VarInt.java
@@ -50,28 +50,45 @@ public class VarInt {
return i;
}
- public static ByteBuf write(ByteBuf buffer, int value) {
- // Paper start - Optimize VarInts
- // Peel the one and two byte count cases explicitly as they are the most common VarInt sizes
- // that the proxy will write, to improve inlining.
- if ((value & (0xFFFFFFFF << 7)) == 0) {
- buffer.writeByte(value);
- } else if ((value & (0xFFFFFFFF << 14)) == 0) {
- int w = (value & 0x7F | 0x80) << 8 | (value >>> 7);
- buffer.writeShort(w);
- } else {
- writeOld(buffer, value);
- }
- return buffer;
- }
- public static ByteBuf writeOld(ByteBuf buffer, int value) {
- // Paper end - Optimize VarInts
- while ((value & -128) != 0) {
- buffer.writeByte(value & 127 | 128);
- value >>>= 7;
+ // DivineMC start - Optimize VarInt
+ public static ByteBuf write(ByteBuf buffer, int value) {
+ int bytesNeeded = getByteSize(value);
+
+ switch (bytesNeeded) {
+ case 1:
+ buffer.writeByte(value);
+ break;
+ case 2:
+ int w2 = ((value & 0x7F) << 8) | (value >>> 7) | 0x00008000;
+ buffer.writeShort(w2);
+ break;
+ case 3:
+ int w3 = (value & 0x7F) << 16
+ | (value & 0x3F80) << 1
+ | (value >>> 14)
+ | 0x00808000;
+ buffer.writeMedium(w3);
+ break;
+ case 4:
+ int w4 = (value & 0x7F) << 24
+ | ((value & 0x3F80) << 9)
+ | (value & 0x1FC000) >> 6
+ | (value >>> 21)
+ | 0x80808000;
+ buffer.writeInt(w4);
+ break;
+ case 5:
+ int w5 = (value & 0x7F) << 24
+ | (value & 0x3F80) << 9
+ | (value & 0x1FC000) >> 6
+ | ((value >>> 21) & 0x7F)
+ | 0x80808080;
+ buffer.writeInt(w5);
+ buffer.writeByte(value >>> 28);
+ break;
}
- buffer.writeByte(value);
return buffer;
}
+ // DivineMC end - Optimize VarInt
}
diff --git a/net/minecraft/network/VarLong.java b/net/minecraft/network/VarLong.java
index df9a85b19a9767c85f02837af6835f7ddb6c7dc3..77f090bc1b9225dd5a61d8c57c902fcdea8ed7cd 100644
--- a/net/minecraft/network/VarLong.java
+++ b/net/minecraft/network/VarLong.java
@@ -38,13 +38,122 @@ public class VarLong {
return l;
}
+ // DivineMC start - Optimize VarLong
public static ByteBuf write(ByteBuf buffer, long value) {
- while ((value & -128L) != 0L) {
- buffer.writeByte((int)(value & 127L) | 128);
- value >>>= 7;
+ if ((value & 0xFFFFFFFFFFFFFF80L) == 0) {
+ buffer.writeByte((int) value);
+ } else if (value < 0) {
+ int least7bits = (int) (value & 0xFFFFFFFL);
+ int w = (least7bits & 0x7F) << 24
+ | (least7bits & 0x3F80) << 9
+ | (least7bits & 0x1FC000) >> 6
+ | ((least7bits >>> 21) & 0x7F)
+ | 0x80808080;
+ long nonLeast7Bits = value >>> 28;
+ int secondLeast7bits = (int) (nonLeast7Bits & 0xFFFFFFFL);
+ int w2 = (secondLeast7bits & 0x7F) << 24
+ | ((secondLeast7bits & 0x3F80) << 9)
+ | (secondLeast7bits & 0x1FC000) >> 6
+ | (secondLeast7bits >>> 21)
+ | 0x80808080;
+ int thirdLeast7Bits = (int) (nonLeast7Bits >>> 28);
+ int w3 = (thirdLeast7Bits & 0x7F) << 8
+ | (thirdLeast7Bits >>> 7)
+ | 0x00008000;
+ buffer.writeInt(w);
+ buffer.writeInt(w2);
+ buffer.writeShort(w3);
+ } else if ((value & 0xFFFFFFFFFFFFC000L) == 0) {
+ int least7bits = (int) value;
+ int w = (least7bits & 0x7F) << 8
+ | (least7bits >>> 7)
+ | 0x00008000;
+ buffer.writeShort(w);
+ } else if ((value & 0xFFFFFFFFFFE00000L) == 0) {
+ int least7bits = (int) value;
+ int w = (least7bits & 0x7F) << 16
+ | (least7bits & 0x3F80) << 1
+ | (least7bits >>> 14)
+ | 0x00808000;
+ buffer.writeMedium(w);
+ } else if ((value & 0xFFFFFFFFF0000000L) == 0) {
+ int least7bits = (int) value;
+ int w = (least7bits & 0x7F) << 24
+ | ((least7bits & 0x3F80) << 9)
+ | (least7bits & 0x1FC000) >> 6
+ | (least7bits >>> 21)
+ | 0x80808000;
+ buffer.writeInt(w);
+ } else if ((value & 0xFFFFFFF800000000L) == 0) {
+ int least7bits = (int) (value & 0xFFFFFFFL);
+ int w = (least7bits & 0x7F) << 24
+ | (least7bits & 0x3F80) << 9
+ | (least7bits & 0x1FC000) >> 6
+ | ((least7bits >>> 21) & 0x7F)
+ | 0x80808080;
+ buffer.writeInt(w);
+ buffer.writeByte((int) (value >>> 28));
+ } else if ((value & 0xFFFFFC0000000000L) == 0) {
+ int least7bits = (int) (value & 0xFFFFFFFL);
+ int w = (least7bits & 0x7F) << 24
+ | (least7bits & 0x3F80) << 9
+ | (least7bits & 0x1FC000) >> 6
+ | ((least7bits >>> 21) & 0x7F)
+ | 0x80808080;
+ int secondLeast7bits = (int) (value >>> 28);
+ int w2 = (secondLeast7bits & 0x7F) << 8
+ | (secondLeast7bits >>> 7)
+ | 0x00008000;
+ buffer.writeInt(w);
+ buffer.writeShort(w2);
+ } else if ((value & 0xFFFE000000000000L) == 0) {
+ int least7bits = (int) (value & 0xFFFFFFFL);
+ int w = (least7bits & 0x7F) << 24
+ | (least7bits & 0x3F80) << 9
+ | (least7bits & 0x1FC000) >> 6
+ | ((least7bits >>> 21) & 0x7F)
+ | 0x80808080;
+ int secondLeast7bits = (int) (value >>> 28);
+ int w2 = (secondLeast7bits & 0x7F) << 16
+ | (secondLeast7bits & 0x3F80) << 1
+ | (secondLeast7bits >>> 14)
+ | 0x00808000;
+ buffer.writeInt(w);
+ buffer.writeMedium(w2);
+ } else if ((value & 0xFF00000000000000L) == 0) {
+ int least7bits = (int) (value & 0xFFFFFFFL);
+ int w = (least7bits & 0x7F) << 24
+ | (least7bits & 0x3F80) << 9
+ | (least7bits & 0x1FC000) >> 6
+ | ((least7bits >>> 21) & 0x7F)
+ | 0x80808080;
+ int secondLeast7bits = (int) (value >>> 28);
+ int w2 = (secondLeast7bits & 0x7F) << 24
+ | ((secondLeast7bits & 0x3F80) << 9)
+ | (secondLeast7bits & 0x1FC000) >> 6
+ | (secondLeast7bits >>> 21)
+ | 0x80808000;
+ buffer.writeInt(w);
+ buffer.writeInt(w2);
+ } else {
+ int least7bits = (int) (value & 0xFFFFFFFL);
+ int w = (least7bits & 0x7F) << 24
+ | (least7bits & 0x3F80) << 9
+ | (least7bits & 0x1FC000) >> 6
+ | ((least7bits >>> 21) & 0x7F)
+ | 0x80808080;
+ long nonLeast7Bits = value >>> 28;
+ int secondLeast7bits = (int) (nonLeast7Bits & 0xFFFFFFFL);
+ int w2 = (secondLeast7bits & 0x7F) << 24
+ | ((secondLeast7bits & 0x3F80) << 9)
+ | (secondLeast7bits & 0x1FC000) >> 6
+ | (secondLeast7bits >>> 21)
+ | 0x80808080;
+ buffer.writeInt(w);
+ buffer.writeInt(w2);
+ buffer.writeByte((int) (nonLeast7Bits >>> 28));
}
-
- buffer.writeByte((int)value);
return buffer;
}
+ // DivineMC end - Optimize VarLong
}
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