1  /* PR tree-optimization/42587 */
       2  /* { dg-do compile } */
       3  /* { dg-require-effective-target bswap } */
       4  /* { dg-options "-O2 -fno-tree-vectorize -fdump-tree-store-merging" } */
       5  /* { dg-additional-options "-march=z900" { target s390-*-* } } */
       6  
       7  typedef unsigned char u8;
       8  typedef unsigned int u32;
       9  union __anonunion_out_195
      10  {
      11    u32 value;
      12    u8 bytes[4];
      13  };
      14  union __anonunion_in_196
      15  {
      16    u32 value;
      17    u8 bytes[4];
      18  };
      19  extern void acpi_ut_track_stack_ptr (void);
      20  u32 acpi_ut_dword_byte_swap (u32 value);
      21  u32
      22  acpi_ut_dword_byte_swap (u32 value)
      23  {
      24    union __anonunion_out_195 out;
      25    union __anonunion_in_196 in;
      26  
      27    {
      28      acpi_ut_track_stack_ptr ();
      29      in.value = value;
      30      out.bytes[0] = in.bytes[3];
      31      out.bytes[1] = in.bytes[2];
      32      out.bytes[2] = in.bytes[1];
      33      out.bytes[3] = in.bytes[0];
      34      return (out.value);
      35    }
      36  }
      37  
      38  /* { dg-final { scan-tree-dump "32 bit bswap implementation found at" "store-merging" } } */