[CIR] Implement ChooseExpr for AggregateExpr (#160999)

Implement the ChooseExpr for aggregate expr

Author: AmrDeveloper

clang/lib/CIR/CodeGen/CIRGenExprAggregate.cpp

@@ -211,9 +211,7 @@ class AggExprEmitter : public StmtVisitor<AggExprEmitter> {
     cgf.cgm.errorNYI(e->getSourceRange(),
                      "AggExprEmitter: VisitAbstractConditionalOperator");
   }
-  void VisitChooseExpr(const ChooseExpr *e) {
-    cgf.cgm.errorNYI(e->getSourceRange(), "AggExprEmitter: VisitChooseExpr");
-  }
+  void VisitChooseExpr(const ChooseExpr *e) { Visit(e->getChosenSubExpr()); }
   void VisitCXXParenListInitExpr(CXXParenListInitExpr *e) {
     cgf.cgm.errorNYI(e->getSourceRange(),
                      "AggExprEmitter: VisitCXXParenListInitExpr");

clang/lib/CIR/CodeGen/CIRGenFunction.cpp

@@ -841,6 +841,8 @@ LValue CIRGenFunction::emitLValue(const Expr *e) {
     return emitCastLValue(cast<CastExpr>(e));
   case Expr::MaterializeTemporaryExprClass:
     return emitMaterializeTemporaryExpr(cast<MaterializeTemporaryExpr>(e));
+  case Expr::ChooseExprClass:
+    return emitLValue(cast<ChooseExpr>(e)->getChosenSubExpr());
   }
 }
 

clang/test/CIR/CodeGen/struct.cpp

@@ -129,3 +129,28 @@ void paren_expr() {
 // OGCG:   %[[B_ADDR:.*]] = alloca %struct.Point, align 4
 // OGCG:   call void @llvm.memset.p0.i64(ptr align 4 %[[A_ADDR]], i8 0, i64 8, i1 false)
 // OGCG:   call void @llvm.memcpy.p0.p0.i64(ptr align 4 %[[B_ADDR]], ptr align 4 %[[A_ADDR]], i64 8, i1 false)
+
+void choose_expr() {
+  CompleteS a;
+  CompleteS b;
+  CompleteS c = __builtin_choose_expr(true, a, b);
+}
+
+// CIR: cir.func{{.*}} @_Z11choose_exprv()
+// CIR:   %[[A_ADDR:.*]] = cir.alloca !rec_CompleteS, !cir.ptr<!rec_CompleteS>, ["a"]
+// CIR:   %[[B_ADDR:.*]] = cir.alloca !rec_CompleteS, !cir.ptr<!rec_CompleteS>, ["b"]
+// CIR:   %[[C_ADDR:.*]] = cir.alloca !rec_CompleteS, !cir.ptr<!rec_CompleteS>, ["c", init]
+// TODO(cir): Call to default copy constructor should be replaced by `cir.copy` op
+// CIR:   cir.call @_ZN9CompleteSC1ERKS_(%[[C_ADDR]], %[[A_ADDR]]) nothrow : (!cir.ptr<!rec_CompleteS>, !cir.ptr<!rec_CompleteS>) -> ()
+
+// LLVM: define{{.*}} void @_Z11choose_exprv()
+// LLVM:   %[[A_ADDR:.*]] = alloca %struct.CompleteS, i64 1, align 4
+// LLVM:   %[[B_ADDR:.*]] = alloca %struct.CompleteS, i64 1, align 4
+// LLVM:   %[[C_ADDR:.*]] = alloca %struct.CompleteS, i64 1, align 4
+// LLVM:   call void @_ZN9CompleteSC1ERKS_(ptr %[[C_ADDR]], ptr %[[A_ADDR]])
+
+// OGCG: define{{.*}} void @_Z11choose_exprv()
+// OGCG:   %[[A_ADDR:.*]] = alloca %struct.CompleteS, align 4
+// OGCG:   %[[B_ADDR:.*]] = alloca %struct.CompleteS, align 4
+// OGCG:   %[[C_ADDR:.*]] = alloca %struct.CompleteS, align 4
+// OGCG:   call void @llvm.memcpy.p0.p0.i64(ptr align 4 %[[C_ADDR]], ptr align 4 %[[A_ADDR]], i64 8, i1 false)