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-rw-r--r--patches/server/0919-Optimize-VarInts.patch52
1 files changed, 52 insertions, 0 deletions
diff --git a/patches/server/0919-Optimize-VarInts.patch b/patches/server/0919-Optimize-VarInts.patch
new file mode 100644
index 0000000000..b96957d432
--- /dev/null
+++ b/patches/server/0919-Optimize-VarInts.patch
@@ -0,0 +1,52 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: astei <[email protected]>
+Date: Sat, 28 Oct 2023 19:46:21 -0400
+Subject: [PATCH] Optimize VarInts
+
+https://github.com/PaperMC/Paper/pull/6957#issuecomment-985250854
+
+diff --git a/src/main/java/net/minecraft/network/VarInt.java b/src/main/java/net/minecraft/network/VarInt.java
+index 49a8ddc269d53458cfbd639b7de838c2e5765748..74ed47659d3e615c2dae7da98d5a8cf1559625bf 100644
+--- a/src/main/java/net/minecraft/network/VarInt.java
++++ b/src/main/java/net/minecraft/network/VarInt.java
+@@ -9,6 +9,18 @@ public class VarInt {
+ private static final int DATA_BITS_PER_BYTE = 7;
+
+ public static int getByteSize(int i) {
++ // Paper start - Optimize VarInts
++ return VARINT_EXACT_BYTE_LENGTHS[Integer.numberOfLeadingZeros(i)];
++ }
++ private static final int[] VARINT_EXACT_BYTE_LENGTHS = new int[33];
++ static {
++ for (int i = 0; i <= 32; ++i) {
++ VARINT_EXACT_BYTE_LENGTHS[i] = (int) Math.ceil((31d - (i - 1)) / 7d);
++ }
++ VARINT_EXACT_BYTE_LENGTHS[32] = 1; // Special case for the number 0.
++ }
++ public static int getByteSizeOld(int i) {
++ // Paper end - Optimize VarInts
+ for (int j = 1; j < 5; j++) {
+ if ((i & -1 << j * 7) == 0) {
+ return j;
+@@ -39,6 +51,21 @@ public class VarInt {
+ }
+
+ public static ByteBuf write(ByteBuf buf, int i) {
++ // 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 ((i & (0xFFFFFFFF << 7)) == 0) {
++ buf.writeByte(i);
++ } else if ((i & (0xFFFFFFFF << 14)) == 0) {
++ int w = (i & 0x7F | 0x80) << 8 | (i >>> 7);
++ buf.writeShort(w);
++ } else {
++ writeOld(buf, i);
++ }
++ return buf;
++ }
++ public static ByteBuf writeOld(ByteBuf buf, int i) {
++ // Paper end - Optimize VarInts
+ while ((i & -128) != 0) {
+ buf.writeByte(i & 127 | 128);
+ i >>>= 7;