[DirectX] Implement DXILResourceImplicitBinding pass (#138043)

The `DXILResourceImplicitBinding` pass uses the results of
`DXILResourceBindingAnalysis` to assigns register slots to resources
that do not have explicit binding. It replaces all
`llvm.dx.resource.handlefromimplicitbinding` calls with
`llvm.dx.resource.handlefrombinding` using the newly assigned binding.

If a binding cannot be found for a resource, the pass will raise a
diagnostic error. Currently this diagnostic message does not include the
resource name, which will be addressed in a separate task (#137868).

Part 2/2 of #136786
Closes #136786

1 files changed, 3 insertions, 0 deletions

diff --git a/llvm/lib/Target/DirectX/DirectXTargetMachine.cpp b/llvm/lib/Target/DirectX/DirectXTargetMachine.cpp
index 19cfa89..0d2730f 100644
--- a/llvm/lib/Target/DirectX/DirectXTargetMachine.cpp
+++ b/llvm/lib/Target/DirectX/DirectXTargetMachine.cpp
@@ -22,6 +22,7 @@
 #include "DXILPostOptimizationValidation.h"
 #include "DXILPrettyPrinter.h"
 #include "DXILResourceAccess.h"
+#include "DXILResourceImplicitBinding.h"
 #include "DXILRootSignature.h"
 #include "DXILShaderFlags.h"
 #include "DXILTranslateMetadata.h"
@@ -63,6 +64,7 @@ extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeDirectXTarget() {
   initializeDXContainerGlobalsPass(*PR);
   initializeDXILOpLoweringLegacyPass(*PR);
   initializeDXILResourceAccessLegacyPass(*PR);
+  initializeDXILResourceImplicitBindingLegacyPass(*PR);
   initializeDXILTranslateMetadataLegacyPass(*PR);
   initializeDXILPostOptimizationValidationLegacyPass(*PR);
   initializeShaderFlagsAnalysisWrapperPass(*PR);
@@ -101,6 +103,7 @@ public:
   FunctionPass *createTargetRegisterAllocator(bool) override { return nullptr; }
   void addCodeGenPrepare() override {
     addPass(createDXILFinalizeLinkageLegacyPass());
+    addPass(createDXILResourceImplicitBindingLegacyPass());
     addPass(createDXILIntrinsicExpansionLegacyPass());
     addPass(createDXILCBufferAccessLegacyPass());
     addPass(createDXILDataScalarizationLegacyPass());