[CIR][LowerToLLVM] Make type converter aware of addrspace

Author: seven-mile

clang/lib/CIR/Lowering/DirectToLLVM/LowerToLLVM.cpp

@@ -3178,7 +3178,8 @@ void prepareTypeConverter(mlir::LLVMTypeConverter &converter,
                           mlir::DataLayout &dataLayout) {
   converter.addConversion([&](mlir::cir::PointerType type) -> mlir::Type {
     // Drop pointee type since LLVM dialect only allows opaque pointers.
-    return mlir::LLVM::LLVMPointerType::get(type.getContext());
+    return mlir::LLVM::LLVMPointerType::get(type.getContext(),
+                                            type.getAddrSpace());
   });
   converter.addConversion([&](mlir::cir::ArrayType type) -> mlir::Type {
     auto ty = converter.convertType(type.getEltType());

clang/test/CIR/Lowering/address-space.cir

@@ -0,0 +1,20 @@
+// RUN: cir-translate %s -cir-to-llvmir -o %t.ll
+// RUN: FileCheck --input-file=%t.ll %s -check-prefix=LLVM
+
+!s32i = !cir.int<s, 32>
+
+module  {
+  // LLVM: define void @foo(ptr %0)
+  cir.func @foo(%arg0: !cir.ptr<!s32i>) {
+    // LLVM-NEXT: alloca ptr,
+    %0 = cir.alloca !cir.ptr<!s32i>, !cir.ptr<!cir.ptr<!s32i>>, ["arg", init] {alignment = 8 : i64}
+    cir.return
+  }
+
+  // LLVM: define void @bar(ptr addrspace(1) %0)
+  cir.func @bar(%arg0: !cir.ptr<!s32i, 1>) {
+    // LLVM-NEXT: alloca ptr addrspace(1)
+    %0 = cir.alloca !cir.ptr<!s32i, 1>, !cir.ptr<!cir.ptr<!s32i, 1>>, ["arg", init] {alignment = 8 : i64}
+    cir.return
+  }
+}