diff --git a/bin/mimalloc-redirect-arm64.dll b/bin/mimalloc-redirect-arm64.dll
index 2b1d3e35..98268796 100644
Binary files a/bin/mimalloc-redirect-arm64.dll and b/bin/mimalloc-redirect-arm64.dll differ
diff --git a/bin/mimalloc-redirect-arm64ec.dll b/bin/mimalloc-redirect-arm64ec.dll
new file mode 100644
index 00000000..fba5f68a
Binary files /dev/null and b/bin/mimalloc-redirect-arm64ec.dll differ
diff --git a/bin/mimalloc-redirect-arm64ec.lib b/bin/mimalloc-redirect-arm64ec.lib
new file mode 100644
index 00000000..1c7c368f
Binary files /dev/null and b/bin/mimalloc-redirect-arm64ec.lib differ
diff --git a/bin/mimalloc-redirect.dll b/bin/mimalloc-redirect.dll
index 4702fec0..5dee3713 100644
Binary files a/bin/mimalloc-redirect.dll and b/bin/mimalloc-redirect.dll differ
diff --git a/bin/mimalloc-redirect.lib b/bin/mimalloc-redirect.lib
index 7d5f19ce..851455a5 100644
Binary files a/bin/mimalloc-redirect.lib and b/bin/mimalloc-redirect.lib differ
diff --git a/bin/mimalloc-redirect32.dll b/bin/mimalloc-redirect32.dll
index 17c05550..1bb909e1 100644
Binary files a/bin/mimalloc-redirect32.dll and b/bin/mimalloc-redirect32.dll differ
diff --git a/bin/mimalloc-redirect32.lib b/bin/mimalloc-redirect32.lib
index a7100afc..45d7297d 100644
Binary files a/bin/mimalloc-redirect32.lib and b/bin/mimalloc-redirect32.lib differ
diff --git a/ide/vs2022/mimalloc-override-test.vcxproj b/ide/vs2022/mimalloc-override-test.vcxproj
index ff5d53d0..97803b9c 100644
--- a/ide/vs2022/mimalloc-override-test.vcxproj
+++ b/ide/vs2022/mimalloc-override-test.vcxproj
@@ -5,6 +5,10 @@
       <Configuration>Debug</Configuration>
       <Platform>ARM64</Platform>
     </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|ARM64EC">
+      <Configuration>Debug</Configuration>
+      <Platform>ARM64EC</Platform>
+    </ProjectConfiguration>
     <ProjectConfiguration Include="Debug|Win32">
       <Configuration>Debug</Configuration>
       <Platform>Win32</Platform>
@@ -13,6 +17,10 @@
       <Configuration>Release</Configuration>
       <Platform>ARM64</Platform>
     </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|ARM64EC">
+      <Configuration>Release</Configuration>
+      <Platform>ARM64EC</Platform>
+    </ProjectConfiguration>
     <ProjectConfiguration Include="Release|Win32">
       <Configuration>Release</Configuration>
       <Platform>Win32</Platform>
@@ -55,6 +63,11 @@
     <UseDebugLibraries>true</UseDebugLibraries>
     <PlatformToolset>v143</PlatformToolset>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64EC'" Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <UseDebugLibraries>true</UseDebugLibraries>
+    <PlatformToolset>v143</PlatformToolset>
+  </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
@@ -67,6 +80,12 @@
     <PlatformToolset>v143</PlatformToolset>
     <WholeProgramOptimization>true</WholeProgramOptimization>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|ARM64EC'" Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <UseDebugLibraries>false</UseDebugLibraries>
+    <PlatformToolset>v143</PlatformToolset>
+    <WholeProgramOptimization>true</WholeProgramOptimization>
+  </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">
   </ImportGroup>
@@ -84,12 +103,18 @@
   <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64'" Label="PropertySheets">
     <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
   </ImportGroup>
+  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64EC'" Label="PropertySheets">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
   <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
     <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
   </ImportGroup>
   <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Release|ARM64'" Label="PropertySheets">
     <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
   </ImportGroup>
+  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Release|ARM64EC'" Label="PropertySheets">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
   <PropertyGroup Label="UserMacros" />
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
     <OutDir>$(ProjectDir)..\..\out\msvc-$(Platform)\$(Configuration)\</OutDir>
@@ -107,6 +132,10 @@
     <OutDir>$(ProjectDir)..\..\out\msvc-$(Platform)\$(Configuration)\</OutDir>
     <IntDir>$(ProjectDir)..\..\out\msvc-$(Platform)\$(ProjectName)\$(Configuration)\</IntDir>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64EC'">
+    <OutDir>$(ProjectDir)..\..\out\msvc-$(Platform)\$(Configuration)\</OutDir>
+    <IntDir>$(ProjectDir)..\..\out\msvc-$(Platform)\$(ProjectName)\$(Configuration)\</IntDir>
+  </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
     <OutDir>$(ProjectDir)..\..\out\msvc-$(Platform)\$(Configuration)\</OutDir>
     <IntDir>$(ProjectDir)..\..\out\msvc-$(Platform)\$(ProjectName)\$(Configuration)\</IntDir>
@@ -115,6 +144,10 @@
     <OutDir>$(ProjectDir)..\..\out\msvc-$(Platform)\$(Configuration)\</OutDir>
     <IntDir>$(ProjectDir)..\..\out\msvc-$(Platform)\$(ProjectName)\$(Configuration)\</IntDir>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|ARM64EC'">
+    <OutDir>$(ProjectDir)..\..\out\msvc-$(Platform)\$(Configuration)\</OutDir>
+    <IntDir>$(ProjectDir)..\..\out\msvc-$(Platform)\$(ProjectName)\$(Configuration)\</IntDir>
+  </PropertyGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
     <ClCompile>
       <WarningLevel>Level3</WarningLevel>
@@ -185,6 +218,30 @@
       </Command>
     </PostBuildEvent>
   </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64EC'">
+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
+      <Optimization>Disabled</Optimization>
+      <SDLCheck>true</SDLCheck>
+      <ConformanceMode>true</ConformanceMode>
+      <AdditionalIncludeDirectories>..\..\include</AdditionalIncludeDirectories>
+      <RuntimeLibrary>MultiThreadedDebugDLL</RuntimeLibrary>
+      <ExceptionHandling>Sync</ExceptionHandling>
+      <CompileAs>Default</CompileAs>
+      <SupportJustMyCode>false</SupportJustMyCode>
+    </ClCompile>
+    <Link>
+      <SubSystem>Console</SubSystem>
+      <EntryPointSymbol>
+      </EntryPointSymbol>
+      <AdditionalDependencies>kernel32.lib;%(AdditionalDependencies)</AdditionalDependencies>
+    </Link>
+    <PostBuildEvent />
+    <PostBuildEvent>
+      <Command>
+      </Command>
+    </PostBuildEvent>
+  </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <ClCompile>
       <WarningLevel>Level3</WarningLevel>
@@ -258,6 +315,31 @@
       </Command>
     </PostBuildEvent>
   </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|ARM64EC'">
+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
+      <Optimization>MaxSpeed</Optimization>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <SDLCheck>true</SDLCheck>
+      <ConformanceMode>true</ConformanceMode>
+      <AdditionalIncludeDirectories>..\..\include</AdditionalIncludeDirectories>
+      <PreprocessorDefinitions>_MBCS;%(PreprocessorDefinitions);NDEBUG</PreprocessorDefinitions>
+      <RuntimeLibrary>MultiThreadedDLL</RuntimeLibrary>
+    </ClCompile>
+    <Link>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
+      <SubSystem>Console</SubSystem>
+      <EntryPointSymbol>
+      </EntryPointSymbol>
+      <AdditionalDependencies>kernel32.lib;user32.lib;gdi32.lib;winspool.lib;comdlg32.lib;advapi32.lib;shell32.lib;ole32.lib;oleaut32.lib;uuid.lib;odbc32.lib;odbccp32.lib;%(AdditionalDependencies)</AdditionalDependencies>
+    </Link>
+    <PostBuildEvent>
+      <Command>
+      </Command>
+    </PostBuildEvent>
+  </ItemDefinitionGroup>
   <ItemGroup>
     <ClCompile Include="..\..\test\main-override.cpp" />
   </ItemGroup>
diff --git a/ide/vs2022/mimalloc-override.vcxproj b/ide/vs2022/mimalloc-override.vcxproj
index 16a48740..9de18895 100644
--- a/ide/vs2022/mimalloc-override.vcxproj
+++ b/ide/vs2022/mimalloc-override.vcxproj
@@ -5,6 +5,10 @@
       <Configuration>Debug</Configuration>
       <Platform>ARM64</Platform>
     </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|ARM64EC">
+      <Configuration>Debug</Configuration>
+      <Platform>ARM64EC</Platform>
+    </ProjectConfiguration>
     <ProjectConfiguration Include="Debug|Win32">
       <Configuration>Debug</Configuration>
       <Platform>Win32</Platform>
@@ -13,6 +17,10 @@
       <Configuration>Release</Configuration>
       <Platform>ARM64</Platform>
     </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|ARM64EC">
+      <Configuration>Release</Configuration>
+      <Platform>ARM64EC</Platform>
+    </ProjectConfiguration>
     <ProjectConfiguration Include="Release|Win32">
       <Configuration>Release</Configuration>
       <Platform>Win32</Platform>
@@ -54,6 +62,11 @@
     <UseDebugLibraries>true</UseDebugLibraries>
     <PlatformToolset>v143</PlatformToolset>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64EC'" Label="Configuration">
+    <ConfigurationType>DynamicLibrary</ConfigurationType>
+    <UseDebugLibraries>true</UseDebugLibraries>
+    <PlatformToolset>v143</PlatformToolset>
+  </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>DynamicLibrary</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
@@ -64,6 +77,11 @@
     <UseDebugLibraries>false</UseDebugLibraries>
     <PlatformToolset>v143</PlatformToolset>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|ARM64EC'" Label="Configuration">
+    <ConfigurationType>DynamicLibrary</ConfigurationType>
+    <UseDebugLibraries>false</UseDebugLibraries>
+    <PlatformToolset>v143</PlatformToolset>
+  </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">
   </ImportGroup>
@@ -81,12 +99,18 @@
   <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64'" Label="PropertySheets">
     <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
   </ImportGroup>
+  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64EC'" Label="PropertySheets">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
   <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
     <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
   </ImportGroup>
   <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Release|ARM64'" Label="PropertySheets">
     <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
   </ImportGroup>
+  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Release|ARM64EC'" Label="PropertySheets">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
   <PropertyGroup Label="UserMacros" />
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
     <OutDir>$(SolutionDir)..\..\out\msvc-$(Platform)\$(Configuration)\</OutDir>
@@ -112,6 +136,12 @@
     <TargetExt>.dll</TargetExt>
     <TargetName>mimalloc-override</TargetName>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64EC'">
+    <OutDir>$(SolutionDir)..\..\out\msvc-$(Platform)\$(Configuration)\</OutDir>
+    <IntDir>$(SolutionDir)..\..\out\msvc-$(Platform)\$(ProjectName)\$(Configuration)\</IntDir>
+    <TargetExt>.dll</TargetExt>
+    <TargetName>mimalloc-override</TargetName>
+  </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
     <OutDir>$(SolutionDir)..\..\out\msvc-$(Platform)\$(Configuration)\</OutDir>
     <IntDir>$(SolutionDir)..\..\out\msvc-$(Platform)\$(ProjectName)\$(Configuration)\</IntDir>
@@ -124,6 +154,12 @@
     <TargetExt>.dll</TargetExt>
     <TargetName>mimalloc-override</TargetName>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|ARM64EC'">
+    <OutDir>$(SolutionDir)..\..\out\msvc-$(Platform)\$(Configuration)\</OutDir>
+    <IntDir>$(SolutionDir)..\..\out\msvc-$(Platform)\$(ProjectName)\$(Configuration)\</IntDir>
+    <TargetExt>.dll</TargetExt>
+    <TargetName>mimalloc-override</TargetName>
+  </PropertyGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
     <ClCompile>
       <WarningLevel>Level3</WarningLevel>
@@ -208,6 +244,34 @@
       <Message>copy mimalloc-redirect-arm64.dll to the output directory</Message>
     </PostBuildEvent>
   </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64EC'">
+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
+      <Optimization>Disabled</Optimization>
+      <SDLCheck>true</SDLCheck>
+      <ConformanceMode>true</ConformanceMode>
+      <AdditionalIncludeDirectories>../../include</AdditionalIncludeDirectories>
+      <PreprocessorDefinitions>MI_DEBUG=4;MI_SHARED_LIB;MI_SHARED_LIB_EXPORT;MI_MALLOC_OVERRIDE;%(PreprocessorDefinitions);</PreprocessorDefinitions>
+      <RuntimeLibrary>MultiThreadedDebugDLL</RuntimeLibrary>
+      <SupportJustMyCode>false</SupportJustMyCode>
+      <CompileAs>CompileAsCpp</CompileAs>
+    </ClCompile>
+    <Link>
+      <AdditionalDependencies>$(ProjectDir)\..\..\bin\mimalloc-redirect-arm64ec.lib;%(AdditionalDependencies)</AdditionalDependencies>
+      <IgnoreSpecificDefaultLibraries>
+      </IgnoreSpecificDefaultLibraries>
+      <ModuleDefinitionFile>
+      </ModuleDefinitionFile>
+      <LinkTimeCodeGeneration>Default</LinkTimeCodeGeneration>
+      <IgnoreAllDefaultLibraries>false</IgnoreAllDefaultLibraries>
+    </Link>
+    <PostBuildEvent>
+      <Command>COPY /Y "$(ProjectDir)..\..\bin\mimalloc-redirect-arm64ec.dll" "$(OutputPath)"</Command>
+    </PostBuildEvent>
+    <PostBuildEvent>
+      <Message>copy mimalloc-redirect-arm64ec.dll to the output directory</Message>
+    </PostBuildEvent>
+  </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <ClCompile>
       <WarningLevel>Level3</WarningLevel>
@@ -305,6 +369,39 @@
       <Message>copy mimalloc-redirect-arm64.dll to the output directory</Message>
     </PostBuildEvent>
   </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|ARM64EC'">
+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
+      <Optimization>MaxSpeed</Optimization>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <ConformanceMode>true</ConformanceMode>
+      <AdditionalIncludeDirectories>../../include</AdditionalIncludeDirectories>
+      <PreprocessorDefinitions>MI_SHARED_LIB;MI_SHARED_LIB_EXPORT;MI_MALLOC_OVERRIDE;%(PreprocessorDefinitions);NDEBUG</PreprocessorDefinitions>
+      <AssemblerOutput>AssemblyAndSourceCode</AssemblerOutput>
+      <AssemblerListingLocation>$(IntDir)</AssemblerListingLocation>
+      <WholeProgramOptimization>false</WholeProgramOptimization>
+      <RuntimeLibrary>MultiThreadedDLL</RuntimeLibrary>
+      <CompileAs>CompileAsCpp</CompileAs>
+      <BufferSecurityCheck>false</BufferSecurityCheck>
+      <EnableEnhancedInstructionSet>CPUExtensionRequirementsARMv81</EnableEnhancedInstructionSet>
+    </ClCompile>
+    <Link>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
+      <AdditionalDependencies>$(ProjectDir)\..\..\bin\mimalloc-redirect-arm64ec.lib;%(AdditionalDependencies)</AdditionalDependencies>
+      <ModuleDefinitionFile>
+      </ModuleDefinitionFile>
+      <LinkTimeCodeGeneration>Default</LinkTimeCodeGeneration>
+      <IgnoreAllDefaultLibraries>false</IgnoreAllDefaultLibraries>
+    </Link>
+    <PostBuildEvent>
+      <Command>COPY /Y "$(ProjectDir)..\..\bin\mimalloc-redirect-arm64ec.dll" "$(OutputPath)"</Command>
+    </PostBuildEvent>
+    <PostBuildEvent>
+      <Message>copy mimalloc-redirect-arm64ec.dll to the output directory</Message>
+    </PostBuildEvent>
+  </ItemDefinitionGroup>
   <ItemGroup>
     <ClInclude Include="$(ProjectDir)..\..\include\mimalloc.h" />
     <ClInclude Include="..\..\include\mimalloc-etw-gen.h" />
@@ -324,16 +421,20 @@
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">false</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">false</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64'">false</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64EC'">false</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|x64'">false</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|ARM64'">false</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|ARM64EC'">false</ExcludedFromBuild>
     </ClCompile>
     <ClCompile Include="..\..\src\alloc-override.c">
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64EC'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|x64'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|ARM64'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|ARM64EC'">true</ExcludedFromBuild>
     </ClCompile>
     <ClCompile Include="..\..\src\alloc-posix.c" />
     <ClCompile Include="..\..\src\alloc.c" />
@@ -342,8 +443,10 @@
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64EC'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|x64'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|ARM64'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|ARM64EC'">true</ExcludedFromBuild>
     </ClCompile>
     <ClCompile Include="..\..\src\arena.c" />
     <ClCompile Include="..\..\src\bitmap.c" />
@@ -356,8 +459,10 @@
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64EC'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|x64'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|ARM64'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|ARM64EC'">true</ExcludedFromBuild>
     </ClCompile>
     <ClCompile Include="..\..\src\options.c" />
     <ClCompile Include="..\..\src\os.c" />
@@ -366,8 +471,10 @@
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       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64EC'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|x64'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|ARM64'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|ARM64EC'">true</ExcludedFromBuild>
     </ClCompile>
     <ClCompile Include="..\..\src\page.c" />
     <ClCompile Include="..\..\src\random.c" />
diff --git a/ide/vs2022/mimalloc-test-api.vcxproj b/ide/vs2022/mimalloc-test-api.vcxproj
index babe7f96..27247569 100644
--- a/ide/vs2022/mimalloc-test-api.vcxproj
+++ b/ide/vs2022/mimalloc-test-api.vcxproj
@@ -5,6 +5,10 @@
       <Configuration>Debug</Configuration>
       <Platform>ARM64</Platform>
     </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|ARM64EC">
+      <Configuration>Debug</Configuration>
+      <Platform>ARM64EC</Platform>
+    </ProjectConfiguration>
     <ProjectConfiguration Include="Debug|Win32">
       <Configuration>Debug</Configuration>
       <Platform>Win32</Platform>
@@ -13,6 +17,10 @@
       <Configuration>Release</Configuration>
       <Platform>ARM64</Platform>
     </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|ARM64EC">
+      <Configuration>Release</Configuration>
+      <Platform>ARM64EC</Platform>
+    </ProjectConfiguration>
     <ProjectConfiguration Include="Release|Win32">
       <Configuration>Release</Configuration>
       <Platform>Win32</Platform>
@@ -55,6 +63,11 @@
     <UseDebugLibraries>true</UseDebugLibraries>
     <PlatformToolset>v143</PlatformToolset>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64EC'" Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <UseDebugLibraries>true</UseDebugLibraries>
+    <PlatformToolset>v143</PlatformToolset>
+  </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
@@ -67,6 +80,12 @@
     <PlatformToolset>v143</PlatformToolset>
     <WholeProgramOptimization>true</WholeProgramOptimization>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|ARM64EC'" Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <UseDebugLibraries>false</UseDebugLibraries>
+    <PlatformToolset>v143</PlatformToolset>
+    <WholeProgramOptimization>true</WholeProgramOptimization>
+  </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">
   </ImportGroup>
@@ -84,12 +103,18 @@
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     <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
   </ImportGroup>
+  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64EC'" Label="PropertySheets">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
   <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
     <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
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     <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
   </ImportGroup>
+  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Release|ARM64EC'" Label="PropertySheets">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
   <PropertyGroup Label="UserMacros" />
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
     <OutDir>$(ProjectDir)..\..\out\msvc-$(Platform)\$(Configuration)\</OutDir>
@@ -107,6 +132,10 @@
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     <IntDir>$(ProjectDir)..\..\out\msvc-$(Platform)\$(ProjectName)\$(Configuration)\</IntDir>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64EC'">
+    <OutDir>$(ProjectDir)..\..\out\msvc-$(Platform)\$(Configuration)\</OutDir>
+    <IntDir>$(ProjectDir)..\..\out\msvc-$(Platform)\$(ProjectName)\$(Configuration)\</IntDir>
+  </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
     <OutDir>$(ProjectDir)..\..\out\msvc-$(Platform)\$(Configuration)\</OutDir>
     <IntDir>$(ProjectDir)..\..\out\msvc-$(Platform)\$(ProjectName)\$(Configuration)\</IntDir>
@@ -115,6 +144,10 @@
     <OutDir>$(ProjectDir)..\..\out\msvc-$(Platform)\$(Configuration)\</OutDir>
     <IntDir>$(ProjectDir)..\..\out\msvc-$(Platform)\$(ProjectName)\$(Configuration)\</IntDir>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|ARM64EC'">
+    <OutDir>$(ProjectDir)..\..\out\msvc-$(Platform)\$(Configuration)\</OutDir>
+    <IntDir>$(ProjectDir)..\..\out\msvc-$(Platform)\$(ProjectName)\$(Configuration)\</IntDir>
+  </PropertyGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
     <ClCompile>
       <WarningLevel>Level3</WarningLevel>
@@ -151,6 +184,18 @@
       <SubSystem>Console</SubSystem>
     </Link>
   </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64EC'">
+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
+      <Optimization>Disabled</Optimization>
+      <SDLCheck>true</SDLCheck>
+      <ConformanceMode>true</ConformanceMode>
+      <AdditionalIncludeDirectories>..\..\include</AdditionalIncludeDirectories>
+    </ClCompile>
+    <Link>
+      <SubSystem>Console</SubSystem>
+    </Link>
+  </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <ClCompile>
       <WarningLevel>Level3</WarningLevel>
@@ -202,18 +247,38 @@
       <SubSystem>Console</SubSystem>
     </Link>
   </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|ARM64EC'">
+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
+      <Optimization>MaxSpeed</Optimization>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <SDLCheck>true</SDLCheck>
+      <ConformanceMode>true</ConformanceMode>
+      <AdditionalIncludeDirectories>..\..\include</AdditionalIncludeDirectories>
+      <PreprocessorDefinitions>%(PreprocessorDefinitions);NDEBUG</PreprocessorDefinitions>
+    </ClCompile>
+    <Link>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
+      <SubSystem>Console</SubSystem>
+    </Link>
+  </ItemDefinitionGroup>
   <ItemGroup>
     <ClCompile Include="..\..\test\test-api-fill.c">
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64EC'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|x64'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|ARM64'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|ARM64EC'">true</ExcludedFromBuild>
     </ClCompile>
     <ClCompile Include="..\..\test\test-api.c">
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">false</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64'">false</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64EC'">false</ExcludedFromBuild>
     </ClCompile>
   </ItemGroup>
   <ItemGroup>
diff --git a/ide/vs2022/mimalloc-test-stress.vcxproj b/ide/vs2022/mimalloc-test-stress.vcxproj
index c033aaeb..fd88cd8e 100644
--- a/ide/vs2022/mimalloc-test-stress.vcxproj
+++ b/ide/vs2022/mimalloc-test-stress.vcxproj
@@ -5,6 +5,10 @@
       <Configuration>Debug</Configuration>
       <Platform>ARM64</Platform>
     </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|ARM64EC">
+      <Configuration>Debug</Configuration>
+      <Platform>ARM64EC</Platform>
+    </ProjectConfiguration>
     <ProjectConfiguration Include="Debug|Win32">
       <Configuration>Debug</Configuration>
       <Platform>Win32</Platform>
@@ -13,6 +17,10 @@
       <Configuration>Release</Configuration>
       <Platform>ARM64</Platform>
     </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|ARM64EC">
+      <Configuration>Release</Configuration>
+      <Platform>ARM64EC</Platform>
+    </ProjectConfiguration>
     <ProjectConfiguration Include="Release|Win32">
       <Configuration>Release</Configuration>
       <Platform>Win32</Platform>
@@ -55,6 +63,11 @@
     <UseDebugLibraries>true</UseDebugLibraries>
     <PlatformToolset>v143</PlatformToolset>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64EC'" Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <UseDebugLibraries>true</UseDebugLibraries>
+    <PlatformToolset>v143</PlatformToolset>
+  </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
@@ -67,6 +80,12 @@
     <PlatformToolset>v143</PlatformToolset>
     <WholeProgramOptimization>true</WholeProgramOptimization>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|ARM64EC'" Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <UseDebugLibraries>false</UseDebugLibraries>
+    <PlatformToolset>v143</PlatformToolset>
+    <WholeProgramOptimization>true</WholeProgramOptimization>
+  </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">
   </ImportGroup>
@@ -84,12 +103,18 @@
   <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64'" Label="PropertySheets">
     <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
   </ImportGroup>
+  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64EC'" Label="PropertySheets">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
   <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
     <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
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   <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Release|ARM64'" Label="PropertySheets">
     <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
   </ImportGroup>
+  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Release|ARM64EC'" Label="PropertySheets">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
   <PropertyGroup Label="UserMacros" />
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
     <OutDir>$(ProjectDir)..\..\out\msvc-$(Platform)\$(Configuration)\</OutDir>
@@ -107,6 +132,10 @@
     <OutDir>$(ProjectDir)..\..\out\msvc-$(Platform)\$(Configuration)\</OutDir>
     <IntDir>$(ProjectDir)..\..\out\msvc-$(Platform)\$(ProjectName)\$(Configuration)\</IntDir>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64EC'">
+    <OutDir>$(ProjectDir)..\..\out\msvc-$(Platform)\$(Configuration)\</OutDir>
+    <IntDir>$(ProjectDir)..\..\out\msvc-$(Platform)\$(ProjectName)\$(Configuration)\</IntDir>
+  </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
     <OutDir>$(ProjectDir)..\..\out\msvc-$(Platform)\$(Configuration)\</OutDir>
     <IntDir>$(ProjectDir)..\..\out\msvc-$(Platform)\$(ProjectName)\$(Configuration)\</IntDir>
@@ -115,6 +144,10 @@
     <OutDir>$(ProjectDir)..\..\out\msvc-$(Platform)\$(Configuration)\</OutDir>
     <IntDir>$(ProjectDir)..\..\out\msvc-$(Platform)\$(ProjectName)\$(Configuration)\</IntDir>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|ARM64EC'">
+    <OutDir>$(ProjectDir)..\..\out\msvc-$(Platform)\$(Configuration)\</OutDir>
+    <IntDir>$(ProjectDir)..\..\out\msvc-$(Platform)\$(ProjectName)\$(Configuration)\</IntDir>
+  </PropertyGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
     <ClCompile>
       <WarningLevel>Level3</WarningLevel>
@@ -151,6 +184,18 @@
       <SubSystem>Console</SubSystem>
     </Link>
   </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64EC'">
+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
+      <Optimization>Disabled</Optimization>
+      <SDLCheck>true</SDLCheck>
+      <ConformanceMode>true</ConformanceMode>
+      <AdditionalIncludeDirectories>..\..\include</AdditionalIncludeDirectories>
+    </ClCompile>
+    <Link>
+      <SubSystem>Console</SubSystem>
+    </Link>
+  </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <ClCompile>
       <WarningLevel>Level3</WarningLevel>
@@ -203,14 +248,34 @@
       <SubSystem>Console</SubSystem>
     </Link>
   </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|ARM64EC'">
+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
+      <Optimization>MaxSpeed</Optimization>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <SDLCheck>true</SDLCheck>
+      <ConformanceMode>true</ConformanceMode>
+      <AdditionalIncludeDirectories>..\..\include</AdditionalIncludeDirectories>
+      <PreprocessorDefinitions>%(PreprocessorDefinitions);NDEBUG</PreprocessorDefinitions>
+      <EnableEnhancedInstructionSet>CPUExtensionRequirementsARMv81</EnableEnhancedInstructionSet>
+    </ClCompile>
+    <Link>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
+      <SubSystem>Console</SubSystem>
+    </Link>
+  </ItemDefinitionGroup>
   <ItemGroup>
     <ClCompile Include="..\..\test\test-stress.c">
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">false</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|x64'">false</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|ARM64'">false</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|ARM64EC'">false</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">false</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">false</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64'">false</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64EC'">false</ExcludedFromBuild>
     </ClCompile>
   </ItemGroup>
   <ItemGroup>
diff --git a/ide/vs2022/mimalloc-test.vcxproj b/ide/vs2022/mimalloc-test.vcxproj
index bfd72287..fc9e9102 100644
--- a/ide/vs2022/mimalloc-test.vcxproj
+++ b/ide/vs2022/mimalloc-test.vcxproj
@@ -5,6 +5,10 @@
       <Configuration>Debug</Configuration>
       <Platform>ARM64</Platform>
     </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|ARM64EC">
+      <Configuration>Debug</Configuration>
+      <Platform>ARM64EC</Platform>
+    </ProjectConfiguration>
     <ProjectConfiguration Include="Debug|Win32">
       <Configuration>Debug</Configuration>
       <Platform>Win32</Platform>
@@ -13,6 +17,10 @@
       <Configuration>Release</Configuration>
       <Platform>ARM64</Platform>
     </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|ARM64EC">
+      <Configuration>Release</Configuration>
+      <Platform>ARM64EC</Platform>
+    </ProjectConfiguration>
     <ProjectConfiguration Include="Release|Win32">
       <Configuration>Release</Configuration>
       <Platform>Win32</Platform>
@@ -55,6 +63,11 @@
     <UseDebugLibraries>true</UseDebugLibraries>
     <PlatformToolset>v143</PlatformToolset>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64EC'" Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <UseDebugLibraries>true</UseDebugLibraries>
+    <PlatformToolset>v143</PlatformToolset>
+  </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>Application</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
@@ -67,6 +80,12 @@
     <PlatformToolset>v143</PlatformToolset>
     <WholeProgramOptimization>true</WholeProgramOptimization>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|ARM64EC'" Label="Configuration">
+    <ConfigurationType>Application</ConfigurationType>
+    <UseDebugLibraries>false</UseDebugLibraries>
+    <PlatformToolset>v143</PlatformToolset>
+    <WholeProgramOptimization>true</WholeProgramOptimization>
+  </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">
   </ImportGroup>
@@ -84,12 +103,18 @@
   <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64'" Label="PropertySheets">
     <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
   </ImportGroup>
+  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64EC'" Label="PropertySheets">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
   <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
     <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
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     <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
   </ImportGroup>
+  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Release|ARM64EC'" Label="PropertySheets">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
   <PropertyGroup Label="UserMacros" />
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
     <OutDir>$(ProjectDir)..\..\out\msvc-$(Platform)\$(Configuration)\</OutDir>
@@ -107,6 +132,10 @@
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     <IntDir>$(ProjectDir)..\..\out\msvc-$(Platform)\$(ProjectName)\$(Configuration)\</IntDir>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64EC'">
+    <OutDir>$(ProjectDir)..\..\out\msvc-$(Platform)\$(Configuration)\</OutDir>
+    <IntDir>$(ProjectDir)..\..\out\msvc-$(Platform)\$(ProjectName)\$(Configuration)\</IntDir>
+  </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
     <OutDir>$(ProjectDir)..\..\out\msvc-$(Platform)\$(Configuration)\</OutDir>
     <IntDir>$(ProjectDir)..\..\out\msvc-$(Platform)\$(ProjectName)\$(Configuration)\</IntDir>
@@ -115,6 +144,10 @@
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     <IntDir>$(ProjectDir)..\..\out\msvc-$(Platform)\$(ProjectName)\$(Configuration)\</IntDir>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|ARM64EC'">
+    <OutDir>$(ProjectDir)..\..\out\msvc-$(Platform)\$(Configuration)\</OutDir>
+    <IntDir>$(ProjectDir)..\..\out\msvc-$(Platform)\$(ProjectName)\$(Configuration)\</IntDir>
+  </PropertyGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
     <ClCompile>
       <WarningLevel>Level3</WarningLevel>
@@ -154,6 +187,19 @@
       <SubSystem>Console</SubSystem>
     </Link>
   </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64EC'">
+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
+      <Optimization>Disabled</Optimization>
+      <SDLCheck>true</SDLCheck>
+      <ConformanceMode>true</ConformanceMode>
+      <AdditionalIncludeDirectories>..\..\include</AdditionalIncludeDirectories>
+      <LanguageStandard>stdcpp17</LanguageStandard>
+    </ClCompile>
+    <Link>
+      <SubSystem>Console</SubSystem>
+    </Link>
+  </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <ClCompile>
       <WarningLevel>Level3</WarningLevel>
@@ -208,6 +254,24 @@
       <SubSystem>Console</SubSystem>
     </Link>
   </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|ARM64EC'">
+    <ClCompile>
+      <WarningLevel>Level3</WarningLevel>
+      <Optimization>MaxSpeed</Optimization>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <SDLCheck>true</SDLCheck>
+      <ConformanceMode>true</ConformanceMode>
+      <AdditionalIncludeDirectories>..\..\include</AdditionalIncludeDirectories>
+      <PreprocessorDefinitions>_MBCS;%(PreprocessorDefinitions);NDEBUG</PreprocessorDefinitions>
+      <LanguageStandard>stdcpp17</LanguageStandard>
+    </ClCompile>
+    <Link>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
+      <SubSystem>Console</SubSystem>
+    </Link>
+  </ItemDefinitionGroup>
   <ItemGroup>
     <ProjectReference Include="mimalloc.vcxproj">
       <Project>{abb5eae7-b3e6-432e-b636-333449892ea6}</Project>
diff --git a/ide/vs2022/mimalloc.sln b/ide/vs2022/mimalloc.sln
index e4a6538b..5a55c98b 100644
--- a/ide/vs2022/mimalloc.sln
+++ b/ide/vs2022/mimalloc.sln
@@ -1,7 +1,7 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio Version 17
-VisualStudioVersion = 17.12.35527.113 d17.12
+VisualStudioVersion = 17.12.35527.113
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "mimalloc", "mimalloc.vcxproj", "{ABB5EAE7-B3E6-432E-B636-333449892EA6}"
 EndProject
@@ -18,81 +18,107 @@ EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|ARM64 = Debug|ARM64
+		Debug|ARM64EC = Debug|ARM64EC
 		Debug|x64 = Debug|x64
 		Debug|x86 = Debug|x86
 		Release|ARM64 = Release|ARM64
+		Release|ARM64EC = Release|ARM64EC
 		Release|x64 = Release|x64
 		Release|x86 = Release|x86
 	EndGlobalSection
 	GlobalSection(ProjectConfigurationPlatforms) = postSolution
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 		{ABB5EAE7-B3E6-432E-B636-333449892EA6}.Debug|ARM64.Build.0 = Debug|ARM64
+		{ABB5EAE7-B3E6-432E-B636-333449892EA6}.Debug|ARM64EC.ActiveCfg = Debug|ARM64EC
+		{ABB5EAE7-B3E6-432E-B636-333449892EA6}.Debug|ARM64EC.Build.0 = Debug|ARM64EC
 		{ABB5EAE7-B3E6-432E-B636-333449892EA6}.Debug|x64.ActiveCfg = Debug|x64
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 		{ABB5EAE7-B3E6-432E-B636-333449892EA6}.Release|ARM64.ActiveCfg = Release|ARM64
 		{ABB5EAE7-B3E6-432E-B636-333449892EA6}.Release|ARM64.Build.0 = Release|ARM64
+		{ABB5EAE7-B3E6-432E-B636-333449892EA6}.Release|ARM64EC.ActiveCfg = Release|ARM64EC
+		{ABB5EAE7-B3E6-432E-B636-333449892EA6}.Release|ARM64EC.Build.0 = Release|ARM64EC
 		{ABB5EAE7-B3E6-432E-B636-333449892EA6}.Release|x64.ActiveCfg = Release|x64
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 		{ABB5EAE7-B3E6-432E-B636-333449892EA6}.Release|x86.ActiveCfg = Release|Win32
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 		{FEF7858F-750E-4C21-A04D-22707CC66878}.Debug|ARM64.ActiveCfg = Debug|ARM64
 		{FEF7858F-750E-4C21-A04D-22707CC66878}.Debug|ARM64.Build.0 = Debug|ARM64
+		{FEF7858F-750E-4C21-A04D-22707CC66878}.Debug|ARM64EC.ActiveCfg = Debug|ARM64EC
+		{FEF7858F-750E-4C21-A04D-22707CC66878}.Debug|ARM64EC.Build.0 = Debug|ARM64EC
 		{FEF7858F-750E-4C21-A04D-22707CC66878}.Debug|x64.ActiveCfg = Debug|x64
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 		{FEF7858F-750E-4C21-A04D-22707CC66878}.Release|ARM64.Build.0 = Release|ARM64
+		{FEF7858F-750E-4C21-A04D-22707CC66878}.Release|ARM64EC.ActiveCfg = Release|ARM64EC
+		{FEF7858F-750E-4C21-A04D-22707CC66878}.Release|ARM64EC.Build.0 = Release|ARM64EC
 		{FEF7858F-750E-4C21-A04D-22707CC66878}.Release|x64.ActiveCfg = Release|x64
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 		{FEF7858F-750E-4C21-A04D-22707CC66878}.Release|x86.ActiveCfg = Release|Win32
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 		{ABB5EAE7-B3E6-432E-B636-333449892EA7}.Debug|ARM64.Build.0 = Debug|ARM64
+		{ABB5EAE7-B3E6-432E-B636-333449892EA7}.Debug|ARM64EC.ActiveCfg = Debug|ARM64EC
+		{ABB5EAE7-B3E6-432E-B636-333449892EA7}.Debug|ARM64EC.Build.0 = Debug|ARM64EC
 		{ABB5EAE7-B3E6-432E-B636-333449892EA7}.Debug|x64.ActiveCfg = Debug|x64
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 		{ABB5EAE7-B3E6-432E-B636-333449892EA7}.Debug|x86.Build.0 = Debug|Win32
 		{ABB5EAE7-B3E6-432E-B636-333449892EA7}.Release|ARM64.ActiveCfg = Release|ARM64
 		{ABB5EAE7-B3E6-432E-B636-333449892EA7}.Release|ARM64.Build.0 = Release|ARM64
+		{ABB5EAE7-B3E6-432E-B636-333449892EA7}.Release|ARM64EC.ActiveCfg = Release|ARM64EC
+		{ABB5EAE7-B3E6-432E-B636-333449892EA7}.Release|ARM64EC.Build.0 = Release|ARM64EC
 		{ABB5EAE7-B3E6-432E-B636-333449892EA7}.Release|x64.ActiveCfg = Release|x64
 		{ABB5EAE7-B3E6-432E-B636-333449892EA7}.Release|x64.Build.0 = Release|x64
 		{ABB5EAE7-B3E6-432E-B636-333449892EA7}.Release|x86.ActiveCfg = Release|Win32
 		{ABB5EAE7-B3E6-432E-B636-333449892EA7}.Release|x86.Build.0 = Release|Win32
 		{FEF7868F-750E-4C21-A04D-22707CC66879}.Debug|ARM64.ActiveCfg = Debug|ARM64
 		{FEF7868F-750E-4C21-A04D-22707CC66879}.Debug|ARM64.Build.0 = Debug|ARM64
+		{FEF7868F-750E-4C21-A04D-22707CC66879}.Debug|ARM64EC.ActiveCfg = Debug|ARM64EC
+		{FEF7868F-750E-4C21-A04D-22707CC66879}.Debug|ARM64EC.Build.0 = Debug|ARM64EC
 		{FEF7868F-750E-4C21-A04D-22707CC66879}.Debug|x64.ActiveCfg = Debug|x64
 		{FEF7868F-750E-4C21-A04D-22707CC66879}.Debug|x64.Build.0 = Debug|x64
 		{FEF7868F-750E-4C21-A04D-22707CC66879}.Debug|x86.ActiveCfg = Debug|Win32
 		{FEF7868F-750E-4C21-A04D-22707CC66879}.Debug|x86.Build.0 = Debug|Win32
 		{FEF7868F-750E-4C21-A04D-22707CC66879}.Release|ARM64.ActiveCfg = Release|ARM64
 		{FEF7868F-750E-4C21-A04D-22707CC66879}.Release|ARM64.Build.0 = Release|ARM64
+		{FEF7868F-750E-4C21-A04D-22707CC66879}.Release|ARM64EC.ActiveCfg = Release|ARM64EC
+		{FEF7868F-750E-4C21-A04D-22707CC66879}.Release|ARM64EC.Build.0 = Release|ARM64EC
 		{FEF7868F-750E-4C21-A04D-22707CC66879}.Release|x64.ActiveCfg = Release|x64
 		{FEF7868F-750E-4C21-A04D-22707CC66879}.Release|x64.Build.0 = Release|x64
 		{FEF7868F-750E-4C21-A04D-22707CC66879}.Release|x86.ActiveCfg = Release|Win32
 		{FEF7868F-750E-4C21-A04D-22707CC66879}.Release|x86.Build.0 = Release|Win32
 		{FEF7958F-750E-4C21-A04D-22707CC66878}.Debug|ARM64.ActiveCfg = Debug|ARM64
 		{FEF7958F-750E-4C21-A04D-22707CC66878}.Debug|ARM64.Build.0 = Debug|ARM64
+		{FEF7958F-750E-4C21-A04D-22707CC66878}.Debug|ARM64EC.ActiveCfg = Debug|ARM64EC
+		{FEF7958F-750E-4C21-A04D-22707CC66878}.Debug|ARM64EC.Build.0 = Debug|ARM64EC
 		{FEF7958F-750E-4C21-A04D-22707CC66878}.Debug|x64.ActiveCfg = Debug|x64
 		{FEF7958F-750E-4C21-A04D-22707CC66878}.Debug|x64.Build.0 = Debug|x64
 		{FEF7958F-750E-4C21-A04D-22707CC66878}.Debug|x86.ActiveCfg = Debug|Win32
 		{FEF7958F-750E-4C21-A04D-22707CC66878}.Debug|x86.Build.0 = Debug|Win32
 		{FEF7958F-750E-4C21-A04D-22707CC66878}.Release|ARM64.ActiveCfg = Release|ARM64
 		{FEF7958F-750E-4C21-A04D-22707CC66878}.Release|ARM64.Build.0 = Release|ARM64
+		{FEF7958F-750E-4C21-A04D-22707CC66878}.Release|ARM64EC.ActiveCfg = Release|ARM64EC
+		{FEF7958F-750E-4C21-A04D-22707CC66878}.Release|ARM64EC.Build.0 = Release|ARM64EC
 		{FEF7958F-750E-4C21-A04D-22707CC66878}.Release|x64.ActiveCfg = Release|x64
 		{FEF7958F-750E-4C21-A04D-22707CC66878}.Release|x64.Build.0 = Release|x64
 		{FEF7958F-750E-4C21-A04D-22707CC66878}.Release|x86.ActiveCfg = Release|Win32
 		{FEF7958F-750E-4C21-A04D-22707CC66878}.Release|x86.Build.0 = Release|Win32
 		{FFF7958F-750E-4C21-A04D-22707CC66878}.Debug|ARM64.ActiveCfg = Debug|ARM64
 		{FFF7958F-750E-4C21-A04D-22707CC66878}.Debug|ARM64.Build.0 = Debug|ARM64
+		{FFF7958F-750E-4C21-A04D-22707CC66878}.Debug|ARM64EC.ActiveCfg = Debug|ARM64EC
+		{FFF7958F-750E-4C21-A04D-22707CC66878}.Debug|ARM64EC.Build.0 = Debug|ARM64EC
 		{FFF7958F-750E-4C21-A04D-22707CC66878}.Debug|x64.ActiveCfg = Debug|x64
 		{FFF7958F-750E-4C21-A04D-22707CC66878}.Debug|x64.Build.0 = Debug|x64
 		{FFF7958F-750E-4C21-A04D-22707CC66878}.Debug|x86.ActiveCfg = Debug|Win32
 		{FFF7958F-750E-4C21-A04D-22707CC66878}.Debug|x86.Build.0 = Debug|Win32
 		{FFF7958F-750E-4C21-A04D-22707CC66878}.Release|ARM64.ActiveCfg = Release|ARM64
 		{FFF7958F-750E-4C21-A04D-22707CC66878}.Release|ARM64.Build.0 = Release|ARM64
+		{FFF7958F-750E-4C21-A04D-22707CC66878}.Release|ARM64EC.ActiveCfg = Release|ARM64EC
+		{FFF7958F-750E-4C21-A04D-22707CC66878}.Release|ARM64EC.Build.0 = Release|ARM64EC
 		{FFF7958F-750E-4C21-A04D-22707CC66878}.Release|x64.ActiveCfg = Release|x64
 		{FFF7958F-750E-4C21-A04D-22707CC66878}.Release|x64.Build.0 = Release|x64
 		{FFF7958F-750E-4C21-A04D-22707CC66878}.Release|x86.ActiveCfg = Release|Win32
diff --git a/ide/vs2022/mimalloc.vcxproj b/ide/vs2022/mimalloc.vcxproj
index fb13cd1f..34a9317a 100644
--- a/ide/vs2022/mimalloc.vcxproj
+++ b/ide/vs2022/mimalloc.vcxproj
@@ -5,6 +5,10 @@
       <Configuration>Debug</Configuration>
       <Platform>ARM64</Platform>
     </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|ARM64EC">
+      <Configuration>Debug</Configuration>
+      <Platform>ARM64EC</Platform>
+    </ProjectConfiguration>
     <ProjectConfiguration Include="Debug|Win32">
       <Configuration>Debug</Configuration>
       <Platform>Win32</Platform>
@@ -13,6 +17,10 @@
       <Configuration>Release</Configuration>
       <Platform>ARM64</Platform>
     </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|ARM64EC">
+      <Configuration>Release</Configuration>
+      <Platform>ARM64EC</Platform>
+    </ProjectConfiguration>
     <ProjectConfiguration Include="Release|Win32">
       <Configuration>Release</Configuration>
       <Platform>Win32</Platform>
@@ -55,6 +63,11 @@
     <UseDebugLibraries>true</UseDebugLibraries>
     <PlatformToolset>v143</PlatformToolset>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64EC'" Label="Configuration">
+    <ConfigurationType>StaticLibrary</ConfigurationType>
+    <UseDebugLibraries>true</UseDebugLibraries>
+    <PlatformToolset>v143</PlatformToolset>
+  </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
     <ConfigurationType>StaticLibrary</ConfigurationType>
     <UseDebugLibraries>false</UseDebugLibraries>
@@ -67,6 +80,12 @@
     <PlatformToolset>v143</PlatformToolset>
     <WholeProgramOptimization>true</WholeProgramOptimization>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|ARM64EC'" Label="Configuration">
+    <ConfigurationType>StaticLibrary</ConfigurationType>
+    <UseDebugLibraries>false</UseDebugLibraries>
+    <PlatformToolset>v143</PlatformToolset>
+    <WholeProgramOptimization>true</WholeProgramOptimization>
+  </PropertyGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">
   </ImportGroup>
@@ -84,12 +103,18 @@
   <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64'" Label="PropertySheets">
     <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
   </ImportGroup>
+  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64EC'" Label="PropertySheets">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
   <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
     <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
   </ImportGroup>
   <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Release|ARM64'" Label="PropertySheets">
     <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
   </ImportGroup>
+  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Release|ARM64EC'" Label="PropertySheets">
+    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
+  </ImportGroup>
   <PropertyGroup Label="UserMacros" />
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
     <OutDir>$(SolutionDir)..\..\out\msvc-$(Platform)\$(Configuration)\</OutDir>
@@ -115,6 +140,12 @@
     <TargetExt>.lib</TargetExt>
     <TargetName>mimalloc-static</TargetName>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64EC'">
+    <OutDir>$(SolutionDir)..\..\out\msvc-$(Platform)\$(Configuration)\</OutDir>
+    <IntDir>$(SolutionDir)..\..\out\msvc-$(Platform)\$(ProjectName)\$(Configuration)\</IntDir>
+    <TargetExt>.lib</TargetExt>
+    <TargetName>mimalloc-static</TargetName>
+  </PropertyGroup>
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
     <OutDir>$(SolutionDir)..\..\out\msvc-$(Platform)\$(Configuration)\</OutDir>
     <IntDir>$(SolutionDir)..\..\out\msvc-$(Platform)\$(ProjectName)\$(Configuration)\</IntDir>
@@ -127,6 +158,12 @@
     <TargetExt>.lib</TargetExt>
     <TargetName>mimalloc-static</TargetName>
   </PropertyGroup>
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|ARM64EC'">
+    <OutDir>$(SolutionDir)..\..\out\msvc-$(Platform)\$(Configuration)\</OutDir>
+    <IntDir>$(SolutionDir)..\..\out\msvc-$(Platform)\$(ProjectName)\$(Configuration)\</IntDir>
+    <TargetExt>.lib</TargetExt>
+    <TargetName>mimalloc-static</TargetName>
+  </PropertyGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
     <ClCompile>
       <WarningLevel>Level4</WarningLevel>
@@ -200,6 +237,33 @@
       </AdditionalDependencies>
     </Lib>
   </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64EC'">
+    <ClCompile>
+      <WarningLevel>Level4</WarningLevel>
+      <Optimization>Disabled</Optimization>
+      <SDLCheck>true</SDLCheck>
+      <ConformanceMode>Default</ConformanceMode>
+      <AdditionalIncludeDirectories>../../include</AdditionalIncludeDirectories>
+      <PreprocessorDefinitions>MI_DEBUG=3;MI_GUARDED=0;%(PreprocessorDefinitions);</PreprocessorDefinitions>
+      <CompileAs>CompileAsCpp</CompileAs>
+      <SupportJustMyCode>false</SupportJustMyCode>
+      <LanguageStandard>stdcpp20</LanguageStandard>
+    </ClCompile>
+    <PostBuildEvent>
+      <Command>
+      </Command>
+    </PostBuildEvent>
+    <Link>
+      <EntryPointSymbol>
+      </EntryPointSymbol>
+    </Link>
+    <Lib>
+      <AdditionalLibraryDirectories>
+      </AdditionalLibraryDirectories>
+      <AdditionalDependencies>
+      </AdditionalDependencies>
+    </Lib>
+  </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <ClCompile>
       <WarningLevel>Level4</WarningLevel>
@@ -298,22 +362,62 @@
       </AdditionalDependencies>
     </Lib>
   </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|ARM64EC'">
+    <ClCompile>
+      <WarningLevel>Level4</WarningLevel>
+      <Optimization>MaxSpeed</Optimization>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <ConformanceMode>Default</ConformanceMode>
+      <AdditionalIncludeDirectories>../../include</AdditionalIncludeDirectories>
+      <PreprocessorDefinitions>%(PreprocessorDefinitions);NDEBUG</PreprocessorDefinitions>
+      <AssemblerOutput>AssemblyAndSourceCode</AssemblerOutput>
+      <AssemblerListingLocation>$(IntDir)</AssemblerListingLocation>
+      <WholeProgramOptimization>false</WholeProgramOptimization>
+      <BufferSecurityCheck>false</BufferSecurityCheck>
+      <InlineFunctionExpansion>Default</InlineFunctionExpansion>
+      <CompileAs>CompileAsCpp</CompileAs>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <LanguageStandard>stdcpp20</LanguageStandard>
+      <EnableEnhancedInstructionSet>CPUExtensionRequirementsARMv81</EnableEnhancedInstructionSet>
+      <ExceptionHandling>Sync</ExceptionHandling>
+    </ClCompile>
+    <Link>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
+      <EntryPointSymbol>
+      </EntryPointSymbol>
+    </Link>
+    <PostBuildEvent>
+      <Command>
+      </Command>
+    </PostBuildEvent>
+    <Lib>
+      <AdditionalLibraryDirectories>
+      </AdditionalLibraryDirectories>
+      <AdditionalDependencies>
+      </AdditionalDependencies>
+    </Lib>
+  </ItemDefinitionGroup>
   <ItemGroup>
     <ClCompile Include="..\..\src\alloc-aligned.c">
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">false</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|x64'">false</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|ARM64'">false</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|ARM64EC'">false</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">false</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">false</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64'">false</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64EC'">false</ExcludedFromBuild>
     </ClCompile>
     <ClCompile Include="..\..\src\alloc-override.c">
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64EC'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|x64'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|ARM64'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|ARM64EC'">true</ExcludedFromBuild>
     </ClCompile>
     <ClCompile Include="..\..\src\alloc-posix.c" />
     <ClCompile Include="..\..\src\alloc.c" />
@@ -322,21 +426,26 @@
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64EC'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|x64'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|ARM64'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|ARM64EC'">true</ExcludedFromBuild>
     </ClCompile>
     <ClCompile Include="..\..\src\arena.c" />
     <ClCompile Include="..\..\src\bitmap.c">
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">false</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64'">false</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64EC'">false</ExcludedFromBuild>
     </ClCompile>
     <ClCompile Include="..\..\src\free.c">
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64EC'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|x64'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|ARM64'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|ARM64EC'">true</ExcludedFromBuild>
     </ClCompile>
     <ClCompile Include="..\..\src\heap.c" />
     <ClCompile Include="..\..\src\init.c" />
@@ -347,8 +456,10 @@
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64EC'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|x64'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|ARM64'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|ARM64EC'">true</ExcludedFromBuild>
     </ClCompile>
     <ClCompile Include="..\..\src\options.c" />
     <ClCompile Include="..\..\src\page-queue.c">
@@ -356,8 +467,10 @@
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64EC'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|x64'">true</ExcludedFromBuild>
       <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|ARM64'">true</ExcludedFromBuild>
+      <ExcludedFromBuild Condition="'$(Configuration)|$(Platform)'=='Release|ARM64EC'">true</ExcludedFromBuild>
     </ClCompile>
     <ClCompile Include="..\..\src\page.c" />
     <ClCompile Include="..\..\src\random.c" />
diff --git a/test/main-override.cpp b/test/main-override.cpp
index 3d56ae42..e7499f2a 100644
--- a/test/main-override.cpp
+++ b/test/main-override.cpp
@@ -47,6 +47,9 @@ int main() {
   mi_stats_reset();  // ignore earlier allocations
   various_tests();
   test_mixed1();
+  const char* ptr = ::_Getdays();
+  free((void*)ptr);
+
   //test_std_string();
   //test_thread_local();
   // heap_thread_free_huge();