Add missing file.

Diffusion-macOS/Capabilities.swift

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+//
+//  Capabilities.swift
+//  Diffusion-macOS
+//
+//  Created by Pedro Cuenca on 20/2/23.
+//
+
+import Foundation
+
+let runningOnMac = true
+
+#if canImport(MLCompute)
+import MLCompute
+let _hasANE = MLCDevice.ane() != nil
+#else
+let _hasANE = false
+#endif
+
+final class Capabilities {
+    static let hasANE = _hasANE
+    
+    // According to my tests this is a good proxy to estimate whether CPU+GPU
+    // or CPU+NE works better. Things may become more complicated if we
+    // choose all compute units.
+    static var performanceCores: Int = {
+        var ncores: Int32 = 0
+        var bytes = MemoryLayout<Int32>.size
+        
+        // In M1/M2 perflevel0 refers to the performance cores and perflevel1 are the efficiency cores
+        // In Intel there's only one performance level
+        let result = sysctlbyname("hw.perflevel0.physicalcpu", &ncores, &bytes, nil, 0)
+        guard result == 0 else { return 0 }
+        return Int(ncores)
+    }()
+}