1  /* Test division by const int generates only one shift.  */
       2  /* { dg-do run } */
       3  /* { dg-options "-O2 -fdump-rtl-combine-all" } */
       4  /* { dg-options "-O2 -fdump-rtl-combine-all -mtune=cortex-a53" { target aarch64*-*-* } } */
       5  /* { dg-require-effective-target int32plus } */
       6  
       7  extern void abort (void);
       8  
       9  #define NOINLINE __attribute__((noinline))
      10  
      11  static NOINLINE int
      12  f1 (int n)
      13  {
      14    return n / 33;
      15  }
      16  
      17  static NOINLINE int
      18  f2 (int n)
      19  {
      20    return n / 77;
      21  }
      22  
      23  int
      24  main ()
      25  {
      26    int a = 0xaaaaaaaa;
      27    int b = 0x55555555;
      28    int c;
      29    c = f1 (a);
      30    if (c != 0xfd6a052c)
      31      abort ();
      32    c = f1 (b);
      33    if (c != 0x295FAD4)
      34      abort ();
      35    c = f2 (a);
      36    if (c != 0xfee44b5c)
      37      abort ();
      38    c = f2 (b);
      39    if (c != 0x11bb4a4)
      40      abort ();
      41    return 0;
      42  }
      43  
      44  /* Following replacement pattern of intger division by constant, GCC is expected
      45     to generate MULT and (x)SHIFTRT.  This test checks that considering division
      46     by const 33, gcc generates a single ASHIFTRT by 35, instead of two - LSHIFTRT
      47     by 32 and ASHIFTRT by 3.  */
      48  
      49  /* { dg-final { scan-rtl-dump "\\(set \\(subreg:DI \\(reg:SI" "combine" { target aarch64*-*-* } } } */
      50  /* { dg-final { scan-rtl-dump "\\(ashiftrt:DI \\(reg:DI" "combine" { target aarch64*-*-* } } } */
      51  /* { dg-final { scan-rtl-dump "\\(const_int 35 " "combine" { target aarch64*-*-* } } } */
      52  
      53  /* Similarly, considering division by const 77, gcc generates a single ASHIFTRT
      54     by 36, instead of two - LSHIFTRT by 32 and ASHIFTRT by 4.  */
      55  
      56  /* { dg-final { scan-rtl-dump "\\(const_int 36 " "combine" { target aarch64*-*-* } } } */
      57