[DirectX] Data Scalarization of Vectors in Global Scope (#110029)

This change adds a pass to scalarize vectors in global scope into
arrays.

There are three distinct parts
1. find the globals that need to be updated and define what the new type
should be
2. initialize that new type and copy over all the right attributes over
from the old type.
3. Use the instruction visitor pattern to update the loads, stores, and
geps for the layout of the new data structure.

resolves https://github.com/llvm/llvm-project/issues/107920

1 files changed, 2 insertions, 0 deletions

diff --git a/llvm/lib/Target/DirectX/DirectXTargetMachine.cpp b/llvm/lib/Target/DirectX/DirectXTargetMachine.cpp
index 606022a9..f358215 100644
--- a/llvm/lib/Target/DirectX/DirectXTargetMachine.cpp
+++ b/llvm/lib/Target/DirectX/DirectXTargetMachine.cpp
@@ -46,6 +46,7 @@ extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeDirectXTarget() {
   RegisterTargetMachine<DirectXTargetMachine> X(getTheDirectXTarget());
   auto *PR = PassRegistry::getPassRegistry();
   initializeDXILIntrinsicExpansionLegacyPass(*PR);
+  initializeDXILDataScalarizationLegacyPass(*PR);
   initializeScalarizerLegacyPassPass(*PR);
   initializeDXILPrepareModulePass(*PR);
   initializeEmbedDXILPassPass(*PR);
@@ -86,6 +87,7 @@ public:
   FunctionPass *createTargetRegisterAllocator(bool) override { return nullptr; }
   void addCodeGenPrepare() override {
     addPass(createDXILIntrinsicExpansionLegacyPass());
+    addPass(createDXILDataScalarizationLegacyPass());
     ScalarizerPassOptions DxilScalarOptions;
     DxilScalarOptions.ScalarizeLoadStore = true;
     addPass(createScalarizerPass(DxilScalarOptions));