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Paper/Spigot-Server-Patches/0294-Speedup-BlockPos-by-fixing-inlining.patch
Shane Freeder fb25dc17c6 Updated Upstream (Bukkit/CraftBukkit) 
Upstream has released updates that appears to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing

Bukkit Changes:
da08d022 SPIGOT-4700: Add PlayerFishEvent.State.REEL_IN
0cef14e4 Remove draft API from selectEntities

CraftBukkit Changes:
a46fdbc6 Remove outdated build delay.
3697519b SPIGOT-4708: Fix ExactChoice recipes neglecting material
9ead7009 SPIGOT-4677: Add minecraft.admin.command_feedback permission
c3749a23 Remove the Damage tag from items when it is 0.
f74c7b95 SPIGOT-4706: Can't interact with active item
494eef45 Mention requirement of JIRA ticket for bug fixes
51d62dec SPIGOT-4702: Exception when middle clicking certain slots
be557e69 SPIGOT-4700: Add PlayerFishEvent.State.REEL_IN
2019-04-22 22:36:14 +01:00

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From a37310c6dad755affd1bf6e87c34649cc598b732 Mon Sep 17 00:00:00 2001
From: Techcable <Techcable@outlook.com>
Date: Wed, 30 Nov 2016 20:56:58 -0600
Subject: [PATCH] Speedup BlockPos by fixing inlining
Normally the JVM can inline virtual getters by having two sets of code, one is the 'optimized' code and the other is the 'deoptimized' code.
If a single type is used 99% of the time, then its worth it to inline, and to revert to 'deoptimized' the 1% of the time we encounter other types.
But if two types are encountered commonly, then the JVM can't inline them both, and the call overhead remains.
This scenario also occurs with BlockPos and MutableBlockPos.
The variables in BlockPos are final, so MutableBlockPos can't modify them.
MutableBlockPos fixes this by adding custom mutable variables, and overriding the getters to access them.
This approach with utility methods that operate on MutableBlockPos and BlockPos.
Specific examples are BlockPosition.up(), and World.isValidLocation().
It makes these simple methods much slower than they need to be.
This should result in an across the board speedup in anything that accesses blocks or does logic with positions.
This is based upon conclusions drawn from inspecting the assenmbly generated bythe JIT compiler on my mircorbenchmarks.
They had 'callq' (invoke) instead of 'mov' (get from memory) instructions.
diff --git a/src/main/java/net/minecraft/server/BaseBlockPosition.java b/src/main/java/net/minecraft/server/BaseBlockPosition.java
index 4c7793f86d..cc17a414f5 100644
--- a/src/main/java/net/minecraft/server/BaseBlockPosition.java
+++ b/src/main/java/net/minecraft/server/BaseBlockPosition.java
@@ -7,22 +7,22 @@ import javax.annotation.concurrent.Immutable;
public class BaseBlockPosition implements Comparable<BaseBlockPosition> {
public static final BaseBlockPosition ZERO = new BaseBlockPosition(0, 0, 0);
- private final int a;
- private final int b;
- private final int c;
// Paper start
+ protected int x;
+ protected int y;
+ protected int z;
public boolean isValidLocation() {
- return a >= -30000000 && c >= -30000000 && a < 30000000 && c < 30000000 && b >= 0 && b < 256;
+ return x >= -30000000 && z >= -30000000 && x < 30000000 && z < 30000000 && y >= 0 && y < 256;
}
public boolean isInvalidYLocation() {
- return b < 0 || b >= 256;
+ return y < 0 || y >= 256;
}
// Paper end
public BaseBlockPosition(int i, int j, int k) {
- this.a = i;
- this.b = j;
- this.c = k;
+ this.x = i;
+ this.y = j;
+ this.z = k;
}
public BaseBlockPosition(double d0, double d1, double d2) {
@@ -49,17 +49,19 @@ public class BaseBlockPosition implements Comparable<BaseBlockPosition> {
return this.getY() == baseblockposition.getY() ? (this.getZ() == baseblockposition.getZ() ? this.getX() - baseblockposition.getX() : this.getZ() - baseblockposition.getZ()) : this.getY() - baseblockposition.getY();
}
- public int getX() {
- return this.a;
+ // Paper start
+ public final int getX() {
+ return this.x;
}
public int getY() {
- return this.b;
+ return this.y;
}
public int getZ() {
- return this.c;
+ return this.z;
}
+ // Paper end
public BaseBlockPosition d(BaseBlockPosition baseblockposition) {
return new BaseBlockPosition(this.getY() * baseblockposition.getZ() - this.getZ() * baseblockposition.getY(), this.getZ() * baseblockposition.getX() - this.getX() * baseblockposition.getZ(), this.getX() * baseblockposition.getY() - this.getY() * baseblockposition.getX());
diff --git a/src/main/java/net/minecraft/server/BlockPosition.java b/src/main/java/net/minecraft/server/BlockPosition.java
index 80e13dfb2e..20cf9255ba 100644
--- a/src/main/java/net/minecraft/server/BlockPosition.java
+++ b/src/main/java/net/minecraft/server/BlockPosition.java
@@ -202,18 +202,18 @@ public class BlockPosition extends BaseBlockPosition {
if (this.g == null) {
this.g = new BlockPosition.MutableBlockPosition(i, j, k);
return this.g;
- } else if (this.g.b == l && this.g.c == i1 && this.g.d == j1) {
+ } else if (this.g.x == l && this.g.y == i1 && this.g.z == j1) {
return (BlockPosition.MutableBlockPosition) this.endOfData();
} else {
- if (this.g.b < l) {
- ++this.g.b;
- } else if (this.g.c < i1) {
- this.g.b = i; // Paper - decompile fix Readd line removed by the decompiler
- ++this.g.c;
- } else if (this.g.d < j1) {
- this.g.b = i; // Paper - decompile fix Readd line removed by the decompiler
- this.g.c = j; // Paper - decompile fix Readd line removed by the decompiler
- ++this.g.d;
+ if (this.g.x < l) {
+ ++this.g.x;
+ } else if (this.g.y < i1) {
+ this.g.x = i; // Paper - decompile fix Readd line removed by the decompiler
+ ++this.g.y;
+ } else if (this.g.z < j1) {
+ this.g.x = i; // Paper - decompile fix Readd line removed by the decompiler
+ this.g.y = j; // Paper - decompile fix Readd line removed by the decompiler
+ ++this.g.z;
}
return this.g;
@@ -296,11 +296,12 @@ public class BlockPosition extends BaseBlockPosition {
}
public static class MutableBlockPosition extends BlockPosition {
-
+ // Paper start - comment out
+ /*
protected int b;
protected int c;
protected int d;
- // Paper start
+
@Override
public boolean isValidLocation() {
return b >= -30000000 && d >= -30000000 && b < 30000000 && d < 30000000 && c >= 0 && c < 256;
@@ -309,6 +310,7 @@ public class BlockPosition extends BaseBlockPosition {
public boolean isInvalidYLocation() {
return c < 0 || c >= 256;
}
+ */
// Paper end
public MutableBlockPosition() {
@@ -320,10 +322,13 @@ public class BlockPosition extends BaseBlockPosition {
}
public MutableBlockPosition(int i, int j, int k) {
- super(0, 0, 0);
+ // Paper start
+ super(i, j, k);
+ /*
this.b = i;
this.c = j;
- this.d = k;
+ this.d = k;*/
+ // Paper end
}
public BlockPosition a(double d0, double d1, double d2) {
@@ -342,6 +347,8 @@ public class BlockPosition extends BaseBlockPosition {
return super.a(enumblockrotation).h();
}
+ /*
+ // Paper start - use parent getters
public int getX() {
return this.b;
}
@@ -352,13 +359,16 @@ public class BlockPosition extends BaseBlockPosition {
public int getZ() {
return this.d;
- }
+ }*/
+ // Paper end
public BlockPosition.MutableBlockPosition setValues(int i, int j, int k) { return c(i, j, k);} // Paper - OBFHELPER
public BlockPosition.MutableBlockPosition c(int i, int j, int k) {
- this.b = i;
- this.c = j;
- this.d = k;
+ // Paper start - use xyz
+ this.x = i;
+ this.y = j;
+ this.z = k;
+ // Paper end
return this;
}
@@ -376,15 +386,15 @@ public class BlockPosition extends BaseBlockPosition {
}
public BlockPosition.MutableBlockPosition c(EnumDirection enumdirection, int i) {
- return this.c(this.b + enumdirection.getAdjacentX() * i, this.c + enumdirection.getAdjacentY() * i, this.d + enumdirection.getAdjacentZ() * i);
+ return this.c(x + enumdirection.getAdjacentX() * i, y + enumdirection.getAdjacentY() * i, z + enumdirection.getAdjacentZ() * i); // Paper - use xyz
}
public BlockPosition.MutableBlockPosition d(int i, int j, int k) {
- return this.c(this.b + i, this.c + j, this.d + k);
+ return this.c(x + i, y + j, z + k); // Paper - use xyz
}
public void p(int i) {
- this.c = i;
+ this.y = i; // Paper change to y
}
public BlockPosition toBlockPosition() { return h(); } // Paper - OBFHELPER
--
2.21.0
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