Realisation v1

tools/test_avx2.ps1

@@ -0,0 +1,15 @@
+$ErrorActionPreference = 'Stop'
+Add-Type -TypeDefinition @'
+using System.Runtime.InteropServices;
+public static class ProcessorFeatures {
+    [DllImport("kernel32.dll")]
+    public static extern bool IsProcessorFeaturePresent(uint feature);
+}
+'@
+
+# PF_AVX2_INSTRUCTIONS_AVAILABLE from processthreadsapi.h / Windows SDK.
+if (-not [ProcessorFeatures]::IsProcessorFeaturePresent(40)) {
+    Write-Warning 'AVX2 is not available; the AVX2 benchmark profile will be skipped.'
+    exit 1
+}
+Write-Host 'AVX2 is available.'