[DirectX] Implement the DXILCBufferAccess pass (#134571)

This introduces a pass that walks accesses to globals in cbuffers and
replaces them with accesses via the cbuffer handle itself. The logic to
interpret the cbuffer metadata is kept in `lib/Frontend/HLSL` so that it
can be reused by other consumers of that metadata.

Fixes #124630.

1 files changed, 3 insertions, 0 deletions

diff --git a/llvm/lib/Target/DirectX/DirectXTargetMachine.cpp b/llvm/lib/Target/DirectX/DirectXTargetMachine.cpp
index 747e4b3..41f6f37 100644
--- a/llvm/lib/Target/DirectX/DirectXTargetMachine.cpp
+++ b/llvm/lib/Target/DirectX/DirectXTargetMachine.cpp
@@ -12,6 +12,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "DirectXTargetMachine.h"
+#include "DXILCBufferAccess.h"
 #include "DXILDataScalarization.h"
 #include "DXILFlattenArrays.h"
 #include "DXILIntrinsicExpansion.h"
@@ -65,6 +66,7 @@ extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeDirectXTarget() {
   initializeRootSignatureAnalysisWrapperPass(*PR);
   initializeDXILFinalizeLinkageLegacyPass(*PR);
   initializeDXILPrettyPrinterLegacyPass(*PR);
+  initializeDXILCBufferAccessLegacyPass(*PR);
 }
 
 class DXILTargetObjectFile : public TargetLoweringObjectFile {
@@ -96,6 +98,7 @@ public:
   void addCodeGenPrepare() override {
     addPass(createDXILFinalizeLinkageLegacyPass());
     addPass(createDXILIntrinsicExpansionLegacyPass());
+    addPass(createDXILCBufferAccessLegacyPass());
     addPass(createDXILDataScalarizationLegacyPass());
     addPass(createDXILFlattenArraysLegacyPass());
     addPass(createDXILResourceAccessLegacyPass());