llvm-project/llvm/test/FrontendC/2002-04-09-StructRetVal.c

// RUN: %llvmgcc -S %s -o - | llvm-as -f -o /dev/null

struct S {
  int i;
  short s1, s2;
};

struct S func_returning_struct(void);

void loop(void) {
  func_returning_struct();
}