[DirectX] Start the creation of a DXIL Instruction legalizer (#131221)

- Legalize i8 truncation back to original types
-  remove sext and truncs
- Legalize i64 indicies for insert\extract elements to i32 indicies
- fixes https://github.com/llvm/llvm-project/issues/126323
- fixes https://github.com/llvm/llvm-project/issues/129757

1 files changed, 3 insertions, 0 deletions

diff --git a/llvm/lib/Target/DirectX/DirectXTargetMachine.cpp b/llvm/lib/Target/DirectX/DirectXTargetMachine.cpp
index 82dc1c6..ce408b4 100644
--- a/llvm/lib/Target/DirectX/DirectXTargetMachine.cpp
+++ b/llvm/lib/Target/DirectX/DirectXTargetMachine.cpp
@@ -15,6 +15,7 @@
 #include "DXILDataScalarization.h"
 #include "DXILFlattenArrays.h"
 #include "DXILIntrinsicExpansion.h"
+#include "DXILLegalizePass.h"
 #include "DXILOpLowering.h"
 #include "DXILPrettyPrinter.h"
 #include "DXILResourceAccess.h"
@@ -52,6 +53,7 @@ extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeDirectXTarget() {
   initializeDXILDataScalarizationLegacyPass(*PR);
   initializeDXILFlattenArraysLegacyPass(*PR);
   initializeScalarizerLegacyPassPass(*PR);
+  initializeDXILLegalizeLegacyPass(*PR);
   initializeDXILPrepareModulePass(*PR);
   initializeEmbedDXILPassPass(*PR);
   initializeWriteDXILPassPass(*PR);
@@ -99,6 +101,7 @@ public:
     ScalarizerPassOptions DxilScalarOptions;
     DxilScalarOptions.ScalarizeLoadStore = true;
     addPass(createScalarizerPass(DxilScalarOptions));
+    addPass(createDXILLegalizeLegacyPass());
     addPass(createDXILTranslateMetadataLegacyPass());
     addPass(createDXILOpLoweringLegacyPass());
     addPass(createDXILPrepareModulePass());