csullivan commented on a change in pull request #7980:
URL: https://github.com/apache/tvm/pull/7980#discussion_r631926225



##########
File path: src/runtime/metal/metal_module.mm
##########
@@ -85,44 +109,49 @@ void SaveToBinary(dmlc::Stream* stream) final {
     if (it != e.smap.end()) return it->second;
     // compile
     NSError* err_msg = nil;
-    if (e.lib == nil) {
-      if (fmt_ == "metal") {
-        MTLCompileOptions* opts = [MTLCompileOptions alloc];
-        opts.languageVersion = MTLLanguageVersion2_3;
-        opts.fastMathEnabled = YES;
-        // opts = nil;
-        e.lib = [w->devices[device_id]
-            newLibraryWithSource:[NSString stringWithUTF8String:data_.c_str()]
-                         options:opts
-                           error:&err_msg];
-        [opts dealloc];
-        if (e.lib == nil) {
-          LOG(FATAL) << "Fail to compile metal lib:" << [[err_msg 
localizedDescription] UTF8String];
-        }
-        if (err_msg != nil) {
-          LOG(INFO) << "Warning: " << [[err_msg localizedDescription] 
UTF8String];
-        }
-      } else {
-        // Build from library.
-        auto q = dispatch_queue_create("q", DISPATCH_QUEUE_SERIAL);
-        auto data = dispatch_data_create(data_.c_str(), data_.length(), q,
-                                         ^{
-                                         });
-        e.lib = [w->devices[device_id] newLibraryWithData:data error:&err_msg];
-        if (err_msg != nil || e.lib == nil) {
-          LOG(FATAL) << "Fail to compile metal lib:" << [[err_msg 
localizedDescription] UTF8String];
-        }
+    id<MTLLibrary> lib = nil;
+    std::string source;
+    auto kernel = parsed_kernels_.find(func_name);
+    if (kernel != parsed_kernels_.end())

Review comment:
       Do we have metal deployments that require the old behavior that can't be 
rebuilt easily? Otherwise we don't need to preserve backward compatibility. 




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