[clang] [llvm] [IR][HLSL] Add llvm.structured.gep instruction (PR #176145)

[Sebastian Neubauer via cfe-commits]

Nathan =?utf-8?q?Gauër?= <brioche at google.com>,
Nathan =?utf-8?q?Gauër?= <brioche at google.com>
Message-ID:
In-Reply-To: <llvm.org/llvm/llvm-project/pull/176145 at github.com>


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@@ -1923,6 +1924,19 @@ class IRBuilderBase {
     return Insert(new AtomicRMWInst(Op, Ptr, Val, *Align, Ordering, SSID));
   }
 
+  StructuredGEPInst *CreateStructuredGEP(Type *BaseType, Value *PtrBase,
+                                         ArrayRef<llvm::Value *> Indices,
+                                         const Twine &Name = "") {
+    SmallVector<llvm::Value *, 4> Args;
+    Args.push_back(llvm::PoisonValue::get(BaseType));
+    Args.push_back(PtrBase);
+    llvm::append_range(Args, Indices);
+
+    return cast<StructuredGEPInst>(
+        CreateIntrinsic(Intrinsic::structured_gep,
+                        {PtrBase->getType(), BaseType}, Args, {}, Name));
----------------
Flakebi wrote:

`preserve_struct_access_index` is another intrinsic that uses elementtype, it adds it like this:
```c++
  CallInst *Fn =
      CreateIntrinsic(Intrinsic::preserve_struct_access_index,
                      {ResultType, BaseType}, {Base, GEPIndex, DIIndex});
  Fn->addParamAttr(
      0, Attribute::get(Fn->getContext(), Attribute::ElementType, ElTy));
```

https://github.com/llvm/llvm-project/pull/176145