================
@@ -189,6 +201,9 @@ class DXILPrepareModule : public ModulePass {
       for (auto &BB : F) {
         IRBuilder<> Builder(&BB);
         for (auto &I : make_early_inc_range(BB)) {
+
+          I.dropUnknownNonDebugMetadata(DXILCompatibleMDs);
+
           if (I.getOpcode() == Instruction::FNeg) {
----------------
farzonl wrote:

DXILPrepare has a bunch of overlap with the legalization pass. Seems like 
MetaData might not be able to move because legalization is a function level 
pass and this is a module level one, but at a minimum it seems like FNeg -> 
FSub should move.

https://github.com/llvm/llvm-project/pull/136386
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