gcc/testsuite/gcc.target/riscv/save-restore-6.c

/* { dg-options "-Os -msave-restore" } */

/* With -msave-restore in use GCC should be able to remove the calls to the
   save and restore stubs in this case, replacing them with a tail call to
   other_func.  */

extern void other_func ();

void func ()
{
  other_func ();
}

/* { dg-final { scan-assembler-not "call\[ \t\]*t0,__riscv_save_0" } } */
/* { dg-final { scan-assembler-not "tail\[ \t\]*__riscv_restore_0" } } */
/* { dg-final { scan-assembler "tail\[ \t\]*other_func" } } */