diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 43008ea008b..b6de2c107f2 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -533,7 +533,7 @@ arm_test:
   variables:
     MESA_IMAGE: "$CI_REGISTRY_IMAGE/${MESA_IMAGE_PATH}:${MESA_IMAGE_TAG}"
     MESA_IMAGE_PATH: "windows/x64_build"
-    MESA_IMAGE_TAG: "2021-03-15-tls"
+    MESA_IMAGE_TAG: "2021-04-14-radv"
     MESA_UPSTREAM_IMAGE: "$CI_REGISTRY/$FDO_UPSTREAM_REPO/$MESA_IMAGE_PATH:${MESA_IMAGE_TAG}"
 
 windows_build_vs2019:
diff --git a/.gitlab-ci/windows/mesa_build.ps1 b/.gitlab-ci/windows/mesa_build.ps1
index 81030c1b154..efa6527c776 100644
--- a/.gitlab-ci/windows/mesa_build.ps1
+++ b/.gitlab-ci/windows/mesa_build.ps1
@@ -7,7 +7,7 @@ Write-Host "Compiling Mesa"
 $builddir = New-Item -ItemType Directory -Name "_build"
 $installdir = New-Item -ItemType Directory -Name "_install"
 Push-Location $builddir.FullName
-cmd.exe /C "C:\BuildTools\Common7\Tools\VsDevCmd.bat -host_arch=amd64 -arch=amd64 && meson --default-library=shared -Dzlib:default_library=static --buildtype=release -Db_ndebug=false -Db_vscrt=mt --cmake-prefix-path=`"C:\llvm-10`" --pkg-config-path=`"C:\llvm-10\lib\pkgconfig;C:\llvm-10\share\pkgconfig;C:\spirv-tools\lib\pkgconfig`" --prefix=`"$installdir`" -Dllvm=enabled -Dshared-llvm=disabled -Dvulkan-drivers=swrast -Dgallium-drivers=swrast,d3d12 -Dmicrosoft-clc=enabled -Dstatic-libclc=all -Dbuild-tests=true -Dwerror=true -Dwarning_level=2 -Dzlib:warning_level=1 && ninja -j32 install && meson test --num-processes 32"
+cmd.exe /C "C:\BuildTools\Common7\Tools\VsDevCmd.bat -host_arch=amd64 -arch=amd64 && meson --default-library=shared -Dzlib:default_library=static --buildtype=release -Db_ndebug=false -Dc_std=c17 -Dcpp_std=vc++latest -Db_vscrt=mt --cmake-prefix-path=`"C:\llvm-10`" --pkg-config-path=`"C:\llvm-10\lib\pkgconfig;C:\llvm-10\share\pkgconfig;C:\spirv-tools\lib\pkgconfig`" --prefix=`"$installdir`" -Dllvm=enabled -Dshared-llvm=disabled -Dvulkan-drivers=swrast,amd -Dgallium-drivers=swrast,d3d12 -Dmicrosoft-clc=enabled -Dstatic-libclc=all -Dbuild-tests=true -Dwerror=true -Dwarning_level=2 -Dzlib:warning_level=1 -Dlibelf:warning_level=1 && ninja -j32 install && meson test --num-processes 32"
 $buildstatus = $?
 Pop-Location
 
diff --git a/.gitlab-ci/windows/mesa_deps.ps1 b/.gitlab-ci/windows/mesa_deps.ps1
index 0e2bc60a9d6..24317edaa47 100644
--- a/.gitlab-ci/windows/mesa_deps.ps1
+++ b/.gitlab-ci/windows/mesa_deps.ps1
@@ -55,7 +55,7 @@ if (!$?) {
 [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12 -bor [Net.SecurityProtocolType]::Tls13;
 
 Get-Date
-Write-Host "Cloning LLVM master"
+Write-Host "Cloning LLVM release/12.x"
 git clone -b release/12.x --depth=1 https://github.com/llvm/llvm-project llvm-project
 if (!$?) {
   Write-Host "Failed to clone LLVM repository"
@@ -81,7 +81,7 @@ Get-Date
 $llvm_build = New-Item -ItemType Directory -Path ".\llvm-project" -Name "build"
 Push-Location -Path $llvm_build.FullName
 Write-Host "Compiling LLVM and Clang"
-cmd.exe /C 'C:\BuildTools\Common7\Tools\VsDevCmd.bat -host_arch=amd64 -arch=amd64 && cmake ../llvm -GNinja -DCMAKE_BUILD_TYPE=Release -DLLVM_USE_CRT_RELEASE=MT -DCMAKE_INSTALL_PREFIX="C:\llvm-10" -DLLVM_ENABLE_PROJECTS="clang;lld" -DLLVM_TARGETS_TO_BUILD=X86 -DLLVM_OPTIMIZED_TABLEGEN=TRUE -DLLVM_ENABLE_ASSERTIONS=TRUE -DLLVM_INCLUDE_UTILS=OFF -DLLVM_INCLUDE_RUNTIMES=OFF -DLLVM_INCLUDE_TESTS=OFF -DLLVM_INCLUDE_EXAMPLES=OFF -DLLVM_INCLUDE_GO_TESTS=OFF -DLLVM_INCLUDE_BENCHMARKS=OFF -DLLVM_BUILD_LLVM_C_DYLIB=OFF -DLLVM_ENABLE_DIA_SDK=OFF -DCLANG_BUILD_TOOLS=ON -DLLVM_SPIRV_INCLUDE_TESTS=OFF && ninja -j32 install'
+cmd.exe /C 'C:\BuildTools\Common7\Tools\VsDevCmd.bat -host_arch=amd64 -arch=amd64 && cmake ../llvm -GNinja -DCMAKE_BUILD_TYPE=Release -DLLVM_USE_CRT_RELEASE=MT -DCMAKE_INSTALL_PREFIX="C:\llvm-10" -DLLVM_ENABLE_PROJECTS="clang;lld" -DLLVM_TARGETS_TO_BUILD=AMDGPU;X86 -DLLVM_OPTIMIZED_TABLEGEN=TRUE -DLLVM_ENABLE_ASSERTIONS=TRUE -DLLVM_INCLUDE_UTILS=OFF -DLLVM_INCLUDE_RUNTIMES=OFF -DLLVM_INCLUDE_TESTS=OFF -DLLVM_INCLUDE_EXAMPLES=OFF -DLLVM_INCLUDE_GO_TESTS=OFF -DLLVM_INCLUDE_BENCHMARKS=OFF -DLLVM_BUILD_LLVM_C_DYLIB=OFF -DLLVM_ENABLE_DIA_SDK=OFF -DCLANG_BUILD_TOOLS=ON -DLLVM_SPIRV_INCLUDE_TESTS=OFF && ninja -j32 install'
 $buildstatus = $?
 Pop-Location
 if (!$buildstatus) {
@@ -94,7 +94,7 @@ $libclc_build = New-Item -ItemType Directory -Path ".\llvm-project" -Name "build
 Push-Location -Path $libclc_build.FullName
 Write-Host "Compiling libclc"
 # libclc can only be built with Ninja, because CMake's VS backend doesn't know how to compile new language types
-cmd.exe /C 'C:\BuildTools\Common7\Tools\VsDevCmd.bat -host_arch=amd64 -arch=amd64 && cmake ../libclc -GNinja -DCMAKE_BUILD_TYPE=Release -DCMAKE_CXX_COMPILER="/llvm-10/bin/clang-cl.exe" -DCMAKE_CXX_FLAGS="-m64" -DCMAKE_POLICY_DEFAULT_CMP0091=NEW -DCMAKE_MSVC_RUNTIME_LIBRARY=MultiThreaded -DCMAKE_INSTALL_PREFIX="C:\llvm-10" -DLIBCLC_TARGETS_TO_BUILD="spirv-mesa3d-;spirv64-mesa3d-" && ninja -j32 install'
+cmd.exe /C 'C:\BuildTools\Common7\Tools\VsDevCmd.bat -host_arch=amd64 -arch=amd64 && cmake ../libclc -GNinja -DCMAKE_BUILD_TYPE=Release -DCMAKE_CXX_FLAGS="-m64" -DCMAKE_POLICY_DEFAULT_CMP0091=NEW -DCMAKE_MSVC_RUNTIME_LIBRARY=MultiThreaded -DCMAKE_INSTALL_PREFIX="C:\llvm-10" -DLIBCLC_TARGETS_TO_BUILD="spirv-mesa3d-;spirv64-mesa3d-" && ninja -j32 install'
 $buildstatus = $?
 Pop-Location
 Remove-Item -Recurse -Path $libclc_build