Metal support for Swift

Author: kchro3

Package.swift

@@ -4,23 +4,27 @@ import PackageDescription
 
 let package = Package(
     name: "llama",
+    platforms: [.macOS(.v11)],
     products: [
         .library(name: "llama", targets: ["llama"]),
     ],
     targets: [
         .target(
             name: "llama",
             path: ".",
-            exclude: ["ggml-metal.metal"],
             sources: [
                 "ggml.c",
                 "llama.cpp",
                 "ggml-alloc.c",
-                "k_quants.c"
+                "k_quants.c",
+                "ggml-metal.m",
             ],
             publicHeadersPath: "spm-headers",
             cSettings: [
                 .unsafeFlags(["-Wno-shorten-64-to-32"]),
+                .unsafeFlags(["-fno-objc-arc"]),
+                .define("GGML_SWIFT"),
+                .define("GGML_USE_METAL"),
                 .define("GGML_USE_K_QUANTS"),
                 .define("GGML_USE_ACCELERATE")
             ],

ggml-metal.m

@@ -140,12 +140,22 @@ @implementation GGMLMetalClass
 
     ctx->d_queue = dispatch_queue_create("llama.cpp", DISPATCH_QUEUE_CONCURRENT);
 
-#if 0
-    // compile from source string and show compile log
+    MTLCompileOptions* options = [MTLCompileOptions new];
+    options.preprocessorMacros = @{ @"QK_K" : @(64) };
+
+#ifdef GGML_SWIFT
+    // load the default.metallib file
     {
         NSError * error = nil;
 
-        ctx->library = [ctx->device newLibraryWithSource:msl_library_source options:nil error:&error];
+        NSBundle * bundle = [NSBundle bundleForClass:[GGMLMetalClass class]];
+        NSString * llamaBundlePath = [bundle pathForResource:@"llama_llama" ofType:@"bundle"];
+        NSBundle * llamaBundle = [NSBundle bundleWithPath:llamaBundlePath];
+        NSString * libPath = [llamaBundle pathForResource:@"default" ofType:@"metallib"];
+
+        // Load the metallib file into a Metal library
+        ctx->library = [ctx->device newLibraryWithFile:libPath error:&error];
+
         if (error) {
             metal_printf("%s: error: %s\n", __func__, [[error description] UTF8String]);
             return NULL;
@@ -170,8 +180,6 @@ @implementation GGMLMetalClass
         }
 
 #ifdef GGML_QKK_64
-        MTLCompileOptions* options = [MTLCompileOptions new];
-        options.preprocessorMacros = @{ @"QK_K" : @(64) };
         ctx->library = [ctx->device newLibraryWithSource:src options:options error:&error];
 #else
         ctx->library = [ctx->device newLibraryWithSource:src options:nil error:&error];