diff --git a/bin/mimalloc-redirect-arm64.dll b/bin/mimalloc-redirect-arm64.dll
index 2b1d3e35..455f8394 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..62569b57
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..eb724d74
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..7d0ec33b 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..cc661036 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/bin/readme.md b/bin/readme.md
index d133eea2..259d74d6 100644
--- a/bin/readme.md
+++ b/bin/readme.md
@@ -5,24 +5,26 @@ is robust and has the particular advantage to be able to redirect all malloc/fre
 the (dynamic) C runtime allocator, including those from other DLL's or libraries.
 As it intercepts all allocation calls on a low level, it can be used reliably 
 on large programs that include other 3rd party components.
-There are four requirements to make the overriding work robustly:
+There are four requirements to make the overriding work well:
 
 1. Use the C-runtime library as a DLL (using the `/MD` or `/MDd` switch).
 
-2. Link your program explicitly with `mimalloc-override.dll` library.
-   To ensure the `mimalloc-override.dll` is loaded at run-time it is easiest to insert some
-  call to the mimalloc API in the `main` function, like `mi_version()`
-  (or use the `/INCLUDE:mi_version` switch on the linker, or
-  use `#pragma comment(linker, "/include:mi_version")` in some source file). 
-  See the `mimalloc-override-test` project for an example on how to use this. 
+2. Link your program explicitly with the `mimalloc-override.lib` export library for
+   the `mimalloc-override.dll` -- which contains all mimalloc functionality.
+   To ensure the `mimalloc-override.dll` is actually loaded at run-time it is easiest to insert some
+   call to the mimalloc API in the `main` function, like `mi_version()`
+   (or use the `/include:mi_version` switch on the linker, or
+   use `#pragma comment(linker, "/include:mi_version")` in some source file). 
+   See the `mimalloc-override-test` project for an example on how to use this. 
 
-3. The `mimalloc-redirect.dll` (x64) (or `mimalloc-redirect32.dll` (x86), or `mimalloc-redirect-arm64.dll` (arm64)) must be put
-   in the same folder as the main `mimalloc-override.dll` at runtime (as it is a dependency of that DLL).
-   The redirection DLL ensures that all calls to the C runtime malloc API get redirected to
-   mimalloc functions (which reside in `mimalloc-override.dll`).
+3. The `mimalloc-redirect.dll` must be put in the same folder as the main 
+   `mimalloc-override.dll` at runtime (as it is a dependency of that DLL).
+   The redirection DLL ensures that all calls to the C runtime malloc API get 
+   redirected to mimalloc functions (which reside in `mimalloc-override.dll`).
 
 4. Ensure the `mimalloc-override.dll` comes as early as possible in the import
    list of the final executable (so it can intercept all potential allocations).
+   You can use `minject -l <exe>` to check this if needed.
 
 For best performance on Windows with C++, it
 is also recommended to also override the `new`/`delete` operations (by including
@@ -32,17 +34,39 @@ a single(!) source file in your project).
 The environment variable `MIMALLOC_DISABLE_REDIRECT=1` can be used to disable dynamic
 overriding at run-time. Use `MIMALLOC_VERBOSE=1` to check if mimalloc was successfully redirected.
 
-## Minject
+### Other Platforms
+
+You always link with `mimalloc-override.dll` but for different platforms you may 
+need a specific `mimalloc-redirect.dll`:
+
+- __x64__: `mimalloc-redirect.dll`.
+- __x86__: `mimalloc-redirect32.dll`. Use for older 32-bit Windows programs.
+- __arm64__: `mimalloc-redirect-arm64.dll`. Use for native Windows arm64 programs.
+- __arm64ec__: `mimalloc-redirect-arm64ec.dll`. The [arm64ec] ABI is "emulation compatible" 
+  mode on Windows arm64. Unfortunately we cannot run x64 code emulated on Windows arm64 with
+  the x64 mimalloc override directly (since the C runtime always uses `arm64ec`). Instead:
+  1. Build the program as normal for x64 and link as normal with the x64 
+     `mimalloc-override.lib` export library.
+  2. Now separately build `mimalloc-override.dll` in `arm64ec` mode and _overwrite_ your
+     previous (x64) `mimalloc-override.dll` -- the loader can handle the mix of arm64ec
+     and x64 code. Now use `mimalloc-redirect-arm64ec.dll` in this case to match your 
+     arm64ec `mimalloc-override.dll`. The main program stays as is and can be fully x64 
+     or contain more arm64ec modules. At runtime, the arm64ec `mimalloc-override.dll` will
+     run with native arm64 instructions while the rest of the program runs emulated x64.
+
+[arm64ec]: https://learn.microsoft.com/en-us/windows/arm/arm64ec
+
+
+### Minject
 
 We cannot always re-link an executable with `mimalloc-override.dll`, and similarly, we cannot always
-ensure the the DLL comes first in the import table of the final executable.
+ensure that the DLL comes first in the import table of the final executable.
 In many cases though we can patch existing executables without any recompilation
 if they are linked with the dynamic C runtime (`ucrtbase.dll`) -- just put the `mimalloc-override.dll`
 into the import table (and put `mimalloc-redirect.dll` in the same folder)
 Such patching can be done for example with [CFF Explorer](https://ntcore.com/?page_id=388).
 
 The `minject` program can also do this from the command line
-(or `minject32` for 32-bit PE files, or `minject-arm64` on arm64 Windows). 
 Use `minject --help` for options:
 
 ```
@@ -72,3 +96,6 @@ examples:
   > minject --list myprogram.exe
   > minject --force --inplace myprogram.exe
 ```  
+
+For x86 32-bit binaries, use `minject32`, and for arm64 binaries use `minject-arm64`.
+
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 @@
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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\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="$(VCTargetsPath)\Microsoft.Cpp.props" />
   <ImportGroup Label="ExtensionSettings">
   </ImportGroup>
@@ -84,12 +103,18 @@
   <ImportGroup Condition="'$(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-$(Platform)\$(ProjectName)\$(Configuration)\</IntDir>
@@ -115,6 +144,10 @@
     <OutDir>$(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 @@
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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>
@@ -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
 		{ABB5EAE7-B3E6-432E-B636-333449892EA6}.Debug|ARM64.ActiveCfg = Debug|ARM64
 		{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
 		{ABB5EAE7-B3E6-432E-B636-333449892EA6}.Debug|x64.Build.0 = Debug|x64
 		{ABB5EAE7-B3E6-432E-B636-333449892EA6}.Debug|x86.ActiveCfg = Debug|Win32
 		{ABB5EAE7-B3E6-432E-B636-333449892EA6}.Debug|x86.Build.0 = Debug|Win32
 		{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
 		{ABB5EAE7-B3E6-432E-B636-333449892EA6}.Release|x64.Build.0 = Release|x64
 		{ABB5EAE7-B3E6-432E-B636-333449892EA6}.Release|x86.ActiveCfg = Release|Win32
 		{ABB5EAE7-B3E6-432E-B636-333449892EA6}.Release|x86.Build.0 = Release|Win32
 		{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
 		{FEF7858F-750E-4C21-A04D-22707CC66878}.Debug|x64.Build.0 = Debug|x64
 		{FEF7858F-750E-4C21-A04D-22707CC66878}.Debug|x86.ActiveCfg = Debug|Win32
 		{FEF7858F-750E-4C21-A04D-22707CC66878}.Debug|x86.Build.0 = Debug|Win32
 		{FEF7858F-750E-4C21-A04D-22707CC66878}.Release|ARM64.ActiveCfg = Release|ARM64
 		{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
 		{FEF7858F-750E-4C21-A04D-22707CC66878}.Release|x64.Build.0 = Release|x64
 		{FEF7858F-750E-4C21-A04D-22707CC66878}.Release|x86.ActiveCfg = Release|Win32
 		{FEF7858F-750E-4C21-A04D-22707CC66878}.Release|x86.Build.0 = Release|Win32
 		{ABB5EAE7-B3E6-432E-B636-333449892EA7}.Debug|ARM64.ActiveCfg = Debug|ARM64
 		{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
 		{ABB5EAE7-B3E6-432E-B636-333449892EA7}.Debug|x64.Build.0 = Debug|x64
 		{ABB5EAE7-B3E6-432E-B636-333449892EA7}.Debug|x86.ActiveCfg = Debug|Win32
 		{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 9b67148f..d6b9cd7b 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)|$(Platform)'=='Release|Win32'">
     <ClCompile>
       <WarningLevel>Level4</WarningLevel>
@@ -298,43 +362,88 @@
       </AdditionalDependencies>
     </Lib>
   </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(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" />
     <ClCompile Include="..\..\src\arena-abandon.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)'=='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" />
@@ -345,8 +454,10 @@
       <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">
@@ -354,8 +465,10 @@
       <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 15da6d4d..1004f94f 100644
--- a/test/main-override.cpp
+++ b/test/main-override.cpp
@@ -50,6 +50,9 @@ 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();