diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index a8d54eb1b47a19d7e6517e200cdacf8ef31b75aa..3b47c60dfddcd600d80269781912afd9860893ef 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -2,9 +2,9 @@ name: ci
 on:
   pull_request:
   push:
-    branches: 
+    branches:
       - master
-concurrency: 
+concurrency:
   # Cancels pending runs when a PR gets updated.
   group: ${{ github.head_ref || github.run_id }}-${{ github.actor }}
   cancel-in-progress: true
@@ -55,15 +55,24 @@ jobs:
         uses: actions/checkout@v3
       - name: Build and Test
         run: ci/aarch64-macos.sh
-  x86_64-windows:
+  x86_64-windows-debug:
     runs-on: windows-latest
-    env: 
+    env:
       ARCH: "x86_64"
     steps:
       - name: Checkout
         uses: actions/checkout@v3
       - name: Build and Test
-        run: ci/x86_64-windows.ps1
+        run: ci/x86_64-windows-debug.ps1
+  x86_64-windows-release:
+    runs-on: windows-latest
+    env:
+      ARCH: "x86_64"
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Build and Test
+        run: ci/x86_64-windows-release.ps1
   aarch64-windows:
     runs-on: [self-hosted, Windows, aarch64]
     env:
diff --git a/ci/x86_64-windows-debug.ps1 b/ci/x86_64-windows-debug.ps1
new file mode 100644
index 0000000000000000000000000000000000000000..b7cde7d4f92e9f074975aae38f27e8324de07e7d
--- /dev/null
+++ b/ci/x86_64-windows-debug.ps1
@@ -0,0 +1,103 @@
+$TARGET = "$($Env:ARCH)-windows-gnu"
+$ZIG_LLVM_CLANG_LLD_NAME = "zig+llvm+lld+clang-$TARGET-0.11.0-dev.448+e6e459e9e"
+$MCPU = "baseline"
+$ZIG_LLVM_CLANG_LLD_URL = "https://ziglang.org/deps/$ZIG_LLVM_CLANG_LLD_NAME.zip"
+$PREFIX_PATH = "$(Get-Location)\$ZIG_LLVM_CLANG_LLD_NAME"
+$ZIG = "$PREFIX_PATH\bin\zig.exe"
+$ZIG_LIB_DIR = "$(Get-Location)\lib"
+
+Write-Output "Downloading $ZIG_LLVM_CLANG_LLD_URL"
+Invoke-WebRequest -Uri "$ZIG_LLVM_CLANG_LLD_URL" -OutFile "$ZIG_LLVM_CLANG_LLD_NAME.zip"
+
+Write-Output "Extracting..."
+Add-Type -AssemblyName System.IO.Compression.FileSystem ;
+[System.IO.Compression.ZipFile]::ExtractToDirectory("$PWD/$ZIG_LLVM_CLANG_LLD_NAME.zip", "$PWD")
+
+function CheckLastExitCode {
+    if (!$?) {
+        exit 1
+    }
+    return 0
+}
+
+# Make the `zig version` number consistent.
+# This will affect the `zig build` command below which uses `git describe`.
+git config core.abbrev 9
+git fetch --tags
+
+if ((git rev-parse --is-shallow-repository) -eq "true") {
+    git fetch --unshallow # `git describe` won't work on a shallow repo
+}
+
+Write-Output "Building from source..."
+Remove-Item -Path 'build-debug' -Recurse -Force -ErrorAction Ignore
+New-Item -Path 'build-debug' -ItemType Directory
+Set-Location -Path 'build-debug'
+
+# CMake gives a syntax error when file paths with backward slashes are used.
+# Here, we use forward slashes only to work around this.
+& cmake .. `
+  -GNinja `
+  -DCMAKE_INSTALL_PREFIX="stage3-debug" `
+  -DCMAKE_PREFIX_PATH="$($PREFIX_PATH -Replace "\\", "/")" `
+  -DCMAKE_BUILD_TYPE=Debug `
+  -DCMAKE_C_COMPILER="$($ZIG -Replace "\\", "/");cc;-target;$TARGET;-mcpu=$MCPU" `
+  -DCMAKE_CXX_COMPILER="$($ZIG -Replace "\\", "/");c++;-target;$TARGET;-mcpu=$MCPU" `
+  -DZIG_TARGET_TRIPLE="$TARGET" `
+  -DZIG_TARGET_MCPU="$MCPU" `
+  -DZIG_STATIC=ON
+CheckLastExitCode
+
+ninja install
+CheckLastExitCode
+
+Write-Output "Main test suite..."
+& "stage3-debug\bin\zig.exe" build test docs `
+  --zig-lib-dir "$ZIG_LIB_DIR" `
+  --search-prefix "$PREFIX_PATH" `
+  -Dstatic-llvm `
+  -Dskip-non-native `
+  -Denable-symlinks-windows
+CheckLastExitCode
+
+Write-Output "Testing Autodocs..."
+& "stage3-debug\bin\zig.exe" test "..\lib\std\std.zig" `
+  --zig-lib-dir "$ZIG_LIB_DIR" `
+  -femit-docs `
+  -fno-emit-bin
+CheckLastExitCode
+
+Write-Output "Build behavior tests using the C backend..."
+& "stage3-debug\bin\zig.exe" test `
+  ..\test\behavior.zig `
+  --zig-lib-dir "$ZIG_LIB_DIR" `
+  -I..\test `
+  -I..\lib `
+  -ofmt=c `
+  -femit-bin="test_behavior.c"
+CheckLastExitCode
+
+& "stage3-debug\bin\zig.exe" build-obj `
+  ..\lib\compiler_rt.zig `
+  --zig-lib-dir "$ZIG_LIB_DIR" `
+  -ofmt=c `
+  -OReleaseSmall `
+  --name compiler_rt `
+  -femit-bin="compiler_rt.c" `
+  --pkg-begin build_options config.zig --pkg-end
+CheckLastExitCode
+
+Import-Module "C:\Program Files\Microsoft Visual Studio\2022\Enterprise\Common7\Tools\Microsoft.VisualStudio.DevShell.dll"
+CheckLastExitCode
+
+Enter-VsDevShell -VsInstallPath "C:\Program Files\Microsoft Visual Studio\2022\Enterprise" `
+  -DevCmdArguments '-arch=x64 -no_logo' `
+  -StartInPath $(Get-Location)
+CheckLastExitCode
+
+Write-Output "Build and run behavior tests with msvc..."
+& cl.exe -I..\lib test_behavior.c compiler_rt.c /W3 /Z7 -link -nologo -debug -subsystem:console -entry:wWinMainCRTStartup kernel32.lib ntdll.lib vcruntime.lib libucrt.lib
+CheckLastExitCode
+
+& .\test_behavior.exe
+CheckLastExitCode
diff --git a/ci/x86_64-windows-release.ps1 b/ci/x86_64-windows-release.ps1
new file mode 100644
index 0000000000000000000000000000000000000000..f2b3d84a26454c9b6b667c19f8c2bdc12d8e113a
--- /dev/null
+++ b/ci/x86_64-windows-release.ps1
@@ -0,0 +1,103 @@
+$TARGET = "$($Env:ARCH)-windows-gnu"
+$ZIG_LLVM_CLANG_LLD_NAME = "zig+llvm+lld+clang-$TARGET-0.11.0-dev.448+e6e459e9e"
+$MCPU = "baseline"
+$ZIG_LLVM_CLANG_LLD_URL = "https://ziglang.org/deps/$ZIG_LLVM_CLANG_LLD_NAME.zip"
+$PREFIX_PATH = "$(Get-Location)\$ZIG_LLVM_CLANG_LLD_NAME"
+$ZIG = "$PREFIX_PATH\bin\zig.exe"
+$ZIG_LIB_DIR = "$(Get-Location)\lib"
+
+Write-Output "Downloading $ZIG_LLVM_CLANG_LLD_URL"
+Invoke-WebRequest -Uri "$ZIG_LLVM_CLANG_LLD_URL" -OutFile "$ZIG_LLVM_CLANG_LLD_NAME.zip"
+
+Write-Output "Extracting..."
+Add-Type -AssemblyName System.IO.Compression.FileSystem ;
+[System.IO.Compression.ZipFile]::ExtractToDirectory("$PWD/$ZIG_LLVM_CLANG_LLD_NAME.zip", "$PWD")
+
+function CheckLastExitCode {
+    if (!$?) {
+        exit 1
+    }
+    return 0
+}
+
+# Make the `zig version` number consistent.
+# This will affect the `zig build` command below which uses `git describe`.
+git config core.abbrev 9
+git fetch --tags
+
+if ((git rev-parse --is-shallow-repository) -eq "true") {
+    git fetch --unshallow # `git describe` won't work on a shallow repo
+}
+
+Write-Output "Building from source..."
+Remove-Item -Path 'build-release' -Recurse -Force -ErrorAction Ignore
+New-Item -Path 'build-release' -ItemType Directory
+Set-Location -Path 'build-release'
+
+# CMake gives a syntax error when file paths with backward slashes are used.
+# Here, we use forward slashes only to work around this.
+& cmake .. `
+  -GNinja `
+  -DCMAKE_INSTALL_PREFIX="stage3-release" `
+  -DCMAKE_PREFIX_PATH="$($PREFIX_PATH -Replace "\\", "/")" `
+  -DCMAKE_BUILD_TYPE=Release `
+  -DCMAKE_C_COMPILER="$($ZIG -Replace "\\", "/");cc;-target;$TARGET;-mcpu=$MCPU" `
+  -DCMAKE_CXX_COMPILER="$($ZIG -Replace "\\", "/");c++;-target;$TARGET;-mcpu=$MCPU" `
+  -DZIG_TARGET_TRIPLE="$TARGET" `
+  -DZIG_TARGET_MCPU="$MCPU" `
+  -DZIG_STATIC=ON
+CheckLastExitCode
+
+ninja install
+CheckLastExitCode
+
+Write-Output "Main test suite..."
+& "stage3-release\bin\zig.exe" build test docs `
+  --zig-lib-dir "$ZIG_LIB_DIR" `
+  --search-prefix "$PREFIX_PATH" `
+  -Dstatic-llvm `
+  -Dskip-non-native `
+  -Denable-symlinks-windows
+CheckLastExitCode
+
+Write-Output "Testing Autodocs..."
+& "stage3-release\bin\zig.exe" test "..\lib\std\std.zig" `
+  --zig-lib-dir "$ZIG_LIB_DIR" `
+  -femit-docs `
+  -fno-emit-bin
+CheckLastExitCode
+
+Write-Output "Build behavior tests using the C backend..."
+& "stage3-release\bin\zig.exe" test `
+  ..\test\behavior.zig `
+  --zig-lib-dir "$ZIG_LIB_DIR" `
+  -I..\test `
+  -I..\lib `
+  -ofmt=c `
+  -femit-bin="test_behavior.c"
+CheckLastExitCode
+
+& "stage3-release\bin\zig.exe" build-obj `
+  ..\lib\compiler_rt.zig `
+  --zig-lib-dir "$ZIG_LIB_DIR" `
+  -ofmt=c `
+  -OReleaseSmall `
+  --name compiler_rt `
+  -femit-bin="compiler_rt.c" `
+  --pkg-begin build_options config.zig --pkg-end
+CheckLastExitCode
+
+Import-Module "C:\Program Files\Microsoft Visual Studio\2022\Enterprise\Common7\Tools\Microsoft.VisualStudio.DevShell.dll"
+CheckLastExitCode
+
+Enter-VsDevShell -VsInstallPath "C:\Program Files\Microsoft Visual Studio\2022\Enterprise" `
+  -DevCmdArguments '-arch=x64 -no_logo' `
+  -StartInPath $(Get-Location)
+CheckLastExitCode
+
+Write-Output "Build and run behavior tests with msvc..."
+& cl.exe -I..\lib test_behavior.c compiler_rt.c /W3 /Z7 -link -nologo -debug -subsystem:console -entry:wWinMainCRTStartup kernel32.lib ntdll.lib vcruntime.lib libucrt.lib
+CheckLastExitCode
+
+& .\test_behavior.exe
+CheckLastExitCode
diff --git a/ci/x86_64-windows.ps1 b/ci/x86_64-windows.ps1
deleted file mode 100644
index e66c6b8d19d2ec08edfe6b934313fbcb5a4d78e0..0000000000000000000000000000000000000000
--- a/ci/x86_64-windows.ps1
+++ /dev/null
@@ -1,103 +0,0 @@
-$TARGET = "$($Env:ARCH)-windows-gnu"
-$ZIG_LLVM_CLANG_LLD_NAME = "zig+llvm+lld+clang-$TARGET-0.11.0-dev.448+e6e459e9e"
-$MCPU = "baseline"
-$ZIG_LLVM_CLANG_LLD_URL = "https://ziglang.org/deps/$ZIG_LLVM_CLANG_LLD_NAME.zip"
-$PREFIX_PATH = "$(Get-Location)\$ZIG_LLVM_CLANG_LLD_NAME"
-$ZIG = "$PREFIX_PATH\bin\zig.exe"
-$ZIG_LIB_DIR = "$(Get-Location)\lib"
-
-Write-Output "Downloading $ZIG_LLVM_CLANG_LLD_URL"
-Invoke-WebRequest -Uri "$ZIG_LLVM_CLANG_LLD_URL" -OutFile "$ZIG_LLVM_CLANG_LLD_NAME.zip"
-
-Write-Output "Extracting..."
-Add-Type -AssemblyName System.IO.Compression.FileSystem ;
-[System.IO.Compression.ZipFile]::ExtractToDirectory("$PWD/$ZIG_LLVM_CLANG_LLD_NAME.zip", "$PWD")
-
-function CheckLastExitCode {
-    if (!$?) {
-        exit 1
-    }
-    return 0
-}
-
-# Make the `zig version` number consistent.
-# This will affect the `zig build` command below which uses `git describe`.
-git config core.abbrev 9
-git fetch --tags
-
-if ((git rev-parse --is-shallow-repository) -eq "true") {
-    git fetch --unshallow # `git describe` won't work on a shallow repo
-}
-
-Write-Output "Building from source..."
-Remove-Item -Path 'build-release' -Recurse -Force -ErrorAction Ignore
-New-Item -Path 'build-release' -ItemType Directory
-Set-Location -Path 'build-release'
-
-# CMake gives a syntax error when file paths with backward slashes are used.
-# Here, we use forward slashes only to work around this.
-& cmake .. `
-  -GNinja `
-  -DCMAKE_INSTALL_PREFIX="stage3-release" `
-  -DCMAKE_PREFIX_PATH="$($PREFIX_PATH -Replace "\\", "/")" `
-  -DCMAKE_BUILD_TYPE=Release `
-  -DCMAKE_C_COMPILER="$($ZIG -Replace "\\", "/");cc;-target;$TARGET;-mcpu=$MCPU" `
-  -DCMAKE_CXX_COMPILER="$($ZIG -Replace "\\", "/");c++;-target;$TARGET;-mcpu=$MCPU" `
-  -DZIG_TARGET_TRIPLE="$TARGET" `
-  -DZIG_TARGET_MCPU="$MCPU" `
-  -DZIG_STATIC=ON
-CheckLastExitCode
-
-ninja install
-CheckLastExitCode
-
-Write-Output "Main test suite..."
-& "stage3-release\bin\zig.exe" build test docs `
-  --zig-lib-dir "$ZIG_LIB_DIR" `
-  --search-prefix "$PREFIX_PATH" `
-  -Dstatic-llvm `
-  -Dskip-non-native `
-  -Denable-symlinks-windows
-CheckLastExitCode
-
-Write-Output "Testing Autodocs..."
-& "stage3-release\bin\zig.exe" test "..\lib\std\std.zig" `
-  --zig-lib-dir "$ZIG_LIB_DIR" `
-  -femit-docs `
-  -fno-emit-bin
-CheckLastExitCode
-
-Write-Output "Build behaviour tests using the C backend..."
-& "stage3-release\bin\zig.exe" test `
-  ..\test\behavior.zig `
-  --zig-lib-dir "$ZIG_LIB_DIR" `
-  -I..\test `
-  -I..\lib `
-  -ofmt=c `
-  -femit-bin="test_behaviour.c"
-CheckLastExitCode
-
-& "stage3-release\bin\zig.exe" build-obj `
-  ..\lib\compiler_rt.zig `
-  --zig-lib-dir "$ZIG_LIB_DIR" `
-  -ofmt=c `
-  -OReleaseSmall `
-  --name compiler_rt `
-  -femit-bin="compiler_rt.c" `
-  --pkg-begin build_options config.zig --pkg-end
-CheckLastExitCode
-
-Import-Module "C:\Program Files\Microsoft Visual Studio\2022\Enterprise\Common7\Tools\Microsoft.VisualStudio.DevShell.dll"
-CheckLastExitCode
-
-Enter-VsDevShell -VsInstallPath "C:\Program Files\Microsoft Visual Studio\2022\Enterprise" `
-  -DevCmdArguments '-arch=x64 -no_logo' `
-  -StartInPath $(Get-Location)
-CheckLastExitCode
-
-Write-Output "Build and run behaviour tests with msvc..."
-& cl.exe -I..\lib test_behaviour.c compiler_rt.c /W3 /Z7 -link -nologo -debug -subsystem:console -entry:wWinMainCRTStartup kernel32.lib ntdll.lib vcruntime.lib libucrt.lib
-CheckLastExitCode
-
-& .\test_behaviour.exe
-CheckLastExitCode