mirror of
https://github.com/PaperMC/Paper.git
synced 2024-11-23 11:06:29 +01:00
53 lines
2.1 KiB
Diff
53 lines
2.1 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
|
|
From: astei <andrew@steinborn.me>
|
|
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 18d5a22ad3ef4cb279475531dbc2c65e07c69929..3f362eb42587b333e27b9cf25588a9cfcb8a56e7 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;
|