gcc/testsuite/gcc.dg/vect/vect-early-break_26.c

   1 /* { dg-add-options vect_early_break } */
   2 /* { dg-require-effective-target vect_early_break_hw } */
   3 /* { dg-require-effective-target vect_int } */
   4 /* { dg-require-effective-target vect_perm } */
   5
   6 #include "tree-vect.h"
   7
   8 void __attribute__((noipa))
   9 foo (int * __restrict__ a, int * __restrict__ b, int * __restrict__ c)
  10 {
  11   int t1 = *c;
  12   int t2 = *c;
  13   for (int i = 0; i < 64; i+=2)
  14     {
  15       b[i] = a[i] - t1;
  16       t1 = a[i];
  17       b[i+1] = a[i+1] - t2;
  18       t2 = a[i+1];
  19     }
  20 }
  21
  22 int a[64], b[64];
  23
  24 int
  25 main ()
  26 {
  27   check_vect ();
  28   for (int i = 0; i < 64; ++i)
  29     {
  30       a[i] = i;
  31       __asm__ volatile ("" ::: "memory");
  32     }
  33   int c = 7;
  34   foo (a, b, &c);
  35   for (int i = 2; i < 64; i+=2)
  36     if (b[i] != a[i] - a[i-2]
  37         || b[i+1] != a[i+1] - a[i-1])
  38       abort ();
  39   if (b[0] != -7 || b[1] != -6)
  40     abort ();
  41   return 0;
  42 }
  43
  44 /* { dg-final { scan-tree-dump-times "vectorized 1 loops in function" 2 "vect" } } */