[CIR][CIRGen][Builtin] Implement builtin addressof (#987)

Author: ghehg

clang/lib/CIR/CodeGen/CIRGenBuiltin.cpp

@@ -1341,6 +1341,10 @@ RValue CIRGenFunction::buildBuiltinExpr(const GlobalDecl GD, unsigned BuiltinID,
 
     return RValue::get(ArithResult.overflow);
   }
+  case Builtin::BIaddressof:
+  case Builtin::BI__addressof:
+  case Builtin::BI__builtin_addressof:
+    return RValue::get(buildLValue(E->getArg(0)).getPointer());
   }
 
   // If this is an alias for a lib function (e.g. __builtin_sin), emit

clang/test/CIR/CodeGen/builtins.cpp

@@ -0,0 +1,58 @@
+// RUN: %clang_cc1 -triple aarch64-none-linux-android24  -emit-cir %s -o %t.cir  
+// RUN: FileCheck --check-prefix=CIR --input-file=%t.cir %s
+// RUN: %clang_cc1 -triple aarch64-none-linux-android24  -fclangir \
+// RUN:  -emit-llvm -fno-clangir-call-conv-lowering -o - %s \
+// RUN:  | opt -S -passes=instcombine,mem2reg,simplifycfg -o %t.ll 
+// RUN: FileCheck  --check-prefix=LLVM --input-file=%t.ll %s
+
+// This test file is a collection of test cases for all target-independent
+// builtins that are related to memory operations.
+
+int s;
+
+int *test_addressof() {
+  return __builtin_addressof(s);
+  
+  // CIR-LABEL: test_addressof
+  // CIR: [[ADDR:%.*]] = cir.get_global @s : !cir.ptr<!s32i>
+  // CIR: cir.store [[ADDR]], [[SAVE:%.*]] : !cir.ptr<!s32i>, !cir.ptr<!cir.ptr<!s32i>>
+  // CIR: [[RES:%.*]] = cir.load [[SAVE]] : !cir.ptr<!cir.ptr<!s32i>>, !cir.ptr<!s32i>
+  // CIR: cir.return [[RES]] : !cir.ptr<!s32i>
+
+  // LLVM-LABEL: test_addressof
+  // LLVM: store ptr @s, ptr [[ADDR:%.*]], align 8
+  // LLVM: [[RES:%.*]] = load ptr, ptr [[ADDR]], align 8
+  // LLVM: ret ptr [[RES]]
+}
+
+namespace std { template<typename T> T *addressof(T &); }
+int *test_std_addressof() {
+  return std::addressof(s);
+  
+  // CIR-LABEL: test_std_addressof
+  // CIR: [[ADDR:%.*]] = cir.get_global @s : !cir.ptr<!s32i>
+  // CIR: cir.store [[ADDR]], [[SAVE:%.*]] : !cir.ptr<!s32i>, !cir.ptr<!cir.ptr<!s32i>>
+  // CIR: [[RES:%.*]] = cir.load [[SAVE]] : !cir.ptr<!cir.ptr<!s32i>>, !cir.ptr<!s32i>
+  // CIR: cir.return [[RES]] : !cir.ptr<!s32i>
+
+  // LLVM-LABEL: test_std_addressof
+  // LLVM: store ptr @s, ptr [[ADDR:%.*]], align 8
+  // LLVM: [[RES:%.*]] = load ptr, ptr [[ADDR]], align 8
+  // LLVM: ret ptr [[RES]]
+}
+
+namespace std { template<typename T> T *__addressof(T &); }
+int *test_std_addressof2() {
+  return std::__addressof(s);
+  
+  // CIR-LABEL: test_std_addressof2
+  // CIR: [[ADDR:%.*]] = cir.get_global @s : !cir.ptr<!s32i>
+  // CIR: cir.store [[ADDR]], [[SAVE:%.*]] : !cir.ptr<!s32i>, !cir.ptr<!cir.ptr<!s32i>>
+  // CIR: [[RES:%.*]] = cir.load [[SAVE]] : !cir.ptr<!cir.ptr<!s32i>>, !cir.ptr<!s32i>
+  // CIR: cir.return [[RES]] : !cir.ptr<!s32i>
+
+  /// LLVM-LABEL: test_std_addressof2
+  // LLVM: store ptr @s, ptr [[ADDR:%.*]], align 8
+  // LLVM: [[RES:%.*]] = load ptr, ptr [[ADDR]], align 8
+  // LLVM: ret ptr [[RES]]
+}