pr20122.c

   1 /* { dg-require-effective-target vect_int } */
   2
   3 #include <stdarg.h>
   4 #include "tree-vect.h"
   5
   6 short Kernshort[24] __attribute__ ((__aligned__(__BIGGEST_ALIGNMENT__)));
   7 static void VecBug(short Kernel[8][24]) __attribute__((noinline));
   8 static void VecBug2(short Kernel[8][24]) __attribute__((noinline));
   9
  10 /* Kernel may alias Kernshort - a global array.
  11    Use versioning for aliasing.  */
  12 static void VecBug(short Kernel[8][24])
  13 {
  14   int k,i;
  15     for (k = 0; k<8; k++)
  16         for (i = 0; i<24; i++)
  17             Kernshort[i] = Kernel[k][i];
  18 }
  19
  20 /* Vectorizable: Kernshort2 is local.  */
  21 static void VecBug2(short Kernel[8][24])
  22 {
  23   int k,i;
  24   short Kernshort2[24] __attribute__ ((__aligned__(__BIGGEST_ALIGNMENT__)));
  25     for (k = 0; k<8; k++)
  26         for (i = 0; i<24; i++)
  27             Kernshort2[i] = Kernel[k][i];
  28
  29     for (k = 0; k<8; k++)
  30         for (i = 0; i<24; i++)
  31             if (Kernshort2[i] != Kernel[k][i])
  32                 abort ();
  33 }
  34
  35 int main (int argc, char **argv)
  36 {
  37     check_vect ();
  38
  39     short Kernel[8][24] __attribute__ ((__aligned__(__BIGGEST_ALIGNMENT__)));
  40     int k,i;
  41
  42     for (k = 0; k<8; k++)
  43         for (i = 0; i<24; i++)
  44             Kernel[k][i] = 0;
  45
  46     VecBug(Kernel);
  47     VecBug2(Kernel);
  48
  49     return 0;
  50 }
  51
  52 /* The loops in VecBug and VecBug2 require versioning for alignment.
  53    The loop in main is aligned.  */
  54 /* { dg-final { scan-tree-dump-times "vectorized 1 loops" 3 "vect" } } */
  55 /*  { dg-final { scan-tree-dump-times "Alignment of access forced using versioning" 2 "vect" { target vect_no_align } } } */
  56 /* { dg-final { cleanup-tree-dump "vect" } } */