From 09764393e0ae2b4cc0414e35f36ddf38aa1a279f Mon Sep 17 00:00:00 2001
From: Connor McLaughlin <stenzek@gmail.com>
Date: Sat, 16 Oct 2021 10:42:31 +1000
Subject: [PATCH] Common: Add align helpers

---
 common/Align.h                | 76 +++++++++++++++++++++++++++++++++++
 common/CMakeLists.txt         |  1 +
 common/common.vcxproj         |  1 +
 common/common.vcxproj.filters |  3 ++
 4 files changed, 81 insertions(+)
 create mode 100644 common/Align.h

diff --git a/common/Align.h b/common/Align.h
new file mode 100644
index 0000000000..d240c17286
--- /dev/null
+++ b/common/Align.h
@@ -0,0 +1,76 @@
+/*  PCSX2 - PS2 Emulator for PCs
+ *  Copyright (C) 2002-2021  PCSX2 Dev Team
+ *
+ *  PCSX2 is free software: you can redistribute it and/or modify it under the terms
+ *  of the GNU Lesser General Public License as published by the Free Software Found-
+ *  ation, either version 3 of the License, or (at your option) any later version.
+ *
+ *  PCSX2 is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
+ *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+ *  PURPOSE.  See the GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License along with PCSX2.
+ *  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+#include "common/Pcsx2Defs.h"
+
+namespace Common
+{
+	template <typename T>
+	static constexpr __fi bool IsAligned(T value, unsigned int alignment)
+	{
+		return (value % static_cast<T>(alignment)) == 0;
+	}
+
+	template <typename T>
+	static constexpr __fi T AlignUp(T value, unsigned int alignment)
+	{
+		return (value + static_cast<T>(alignment - 1)) / static_cast<T>(alignment) * static_cast<T>(alignment);
+	}
+
+	template <typename T>
+	static constexpr __fi T AlignDown(T value, unsigned int alignment)
+	{
+		return value / static_cast<T>(alignment) * static_cast<T>(alignment);
+	}
+
+	template <typename T>
+	static constexpr __fi bool IsAlignedPow2(T value, unsigned int alignment)
+	{
+		return (value & static_cast<T>(alignment - 1)) == 0;
+	}
+
+	template <typename T>
+	static constexpr __fi T AlignUpPow2(T value, unsigned int alignment)
+	{
+		return (value + static_cast<T>(alignment - 1)) & static_cast<T>(~static_cast<T>(alignment - 1));
+	}
+
+	template <typename T>
+	static constexpr __fi T AlignDownPow2(T value, unsigned int alignment)
+	{
+		return value & static_cast<T>(~static_cast<T>(alignment - 1));
+	}
+
+	template <typename T>
+	static constexpr __fi bool IsPow2(T value)
+	{
+		return (value & (value - 1)) == 0;
+	}
+
+	template <typename T>
+	static constexpr __fi T PreviousPow2(T value)
+	{
+		if (value == static_cast<T>(0))
+			return 0;
+
+		value |= (value >> 1);
+		value |= (value >> 2);
+		value |= (value >> 4);
+		value |= (value >> 8);
+		value |= (value >> 16);
+		return value - (value >> 1);
+	}
+} // namespace Common
diff --git a/common/CMakeLists.txt b/common/CMakeLists.txt
index 174f03eab5..21ff56415c 100644
--- a/common/CMakeLists.txt
+++ b/common/CMakeLists.txt
@@ -57,6 +57,7 @@ target_sources(common PRIVATE
 
 # x86emitter headers
 target_sources(common PRIVATE
+	Align.h
 	Assertions.h
 	boost_spsc_queue.hpp
 	Console.h
diff --git a/common/common.vcxproj b/common/common.vcxproj
index 1279726b75..09c4f331bf 100644
--- a/common/common.vcxproj
+++ b/common/common.vcxproj
@@ -94,6 +94,7 @@
     </MASM>
   </ItemGroup>
   <ItemGroup>
+    <ClInclude Include="Align.h" />
     <ClInclude Include="EmbeddedImage.h" />
     <ClInclude Include="boost_spsc_queue.hpp" />
     <ClInclude Include="FastJmp.h" />
diff --git a/common/common.vcxproj.filters b/common/common.vcxproj.filters
index c35d5215d9..c134c67756 100644
--- a/common/common.vcxproj.filters
+++ b/common/common.vcxproj.filters
@@ -273,6 +273,9 @@
     <ClInclude Include="ScopedGuard.h">
       <Filter>Header Files</Filter>
     </ClInclude>
+    <ClInclude Include="Align.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <Filter Include="Source Files">