gcc/testsuite/gcc.dg/vect/slp-48.c

   1 /* { dg-require-effective-target vect_int } */
   2 /* { dg-require-effective-target vect_perm } */
   3
   4 #include "tree-vect.h"
   5
   6 int x[1024], y[1024];
   7
   8 void __attribute__((noipa)) foo()
   9 {
  10   for (int i = 0; i < 512; ++i)
  11     {
  12       x[1023 - (2*i+1)] = y[2*i];
  13       x[1023 - (2*i)] = y[2*i+1];
  14     }
  15 }
  16
  17 void __attribute__((noipa)) bar()
  18 {
  19   for (int i = 0; i < 512; ++i)
  20     {
  21       x[1023 - (2*i+1)] = y[2*i+1];
  22       x[1023 - (2*i)] = y[2*i];
  23     }
  24 }
  25
  26 int
  27 main ()
  28 {
  29   check_vect ();
  30
  31   for (int i = 0; i < 1024; ++i)
  32     {
  33       x[i] = 0;
  34       y[i] = i;
  35       __asm__ volatile ("");
  36     }
  37
  38   foo ();
  39 #pragma GCC novector
  40   for (int i = 0; i < 1024; ++i)
  41     if (x[i] != y[1023 - i^1])
  42       abort ();
  43
  44   for (int i = 0; i < 1024; ++i)
  45     {
  46       x[i] = 0;
  47       __asm__ volatile ("");
  48     }
  49
  50   bar ();
  51 #pragma GCC novector
  52   for (int i = 0; i < 1024; ++i)
  53     if (x[i] != y[1023 - i])
  54       abort ();
  55
  56   return 0;
  57 }
  58
  59 /* { dg-final { scan-tree-dump-times "vectorizing stmts using SLP" 2 "vect" } } */