gcc/testsuite/gcc.dg/vect/pr80815-3.c

   1 /* { dg-require-effective-target vect_int } */
   2
   3 #include "tree-vect.h"
   4 int arr[2048];
   5 int res[100] = { 2148, 2146, 2144, 2142, 2140, 2138, 2136, 2134, 2132, 2130,
   6                  2128, 2126, 2124, 2122, 2120, 2118, 2116, 2114, 2112, 2110,
   7                  2108, 2106, 2104, 2102, 2100, 2098, 2096, 2094, 2092, 2090,
   8                  2088, 2086, 2084, 2082, 2080, 2078, 2076, 2074, 2072, 2070,
   9                  2068, 2066, 2064, 2062, 2060, 2058, 2056, 2054, 3078, 2050};
  10
  11 __attribute__ ((noinline)) int
  12 foo (int *a, int *b, int len)
  13 {
  14   int i;
  15   int *a1 = a;
  16   int *a0 = a1 - 4;
  17   for (i = 0; i < len; i++)
  18     {
  19       *b = *a0 + *a1;
  20       b--;
  21       a0++;
  22       a1++;
  23     }
  24   return 0;
  25 }
  26
  27 int main (void)
  28 {
  29   int *a = &arr[1027];
  30   int *b = &arr[1024];
  31
  32   int i;
  33   for (i = 0; i < 2048; i++)
  34     arr[i] = i;
  35
  36   foo (a, b, 50);
  37
  38   for (i = 975; i < 1025; i++)
  39     if (arr[i] != res[i - 975])
  40       abort ();
  41
  42   return 0;
  43 }
  44
  45 /* { dg-final { scan-tree-dump "improved number of alias checks from \[0-9\]* to 1" "vect" { target vect_perm } } } */