gcc/testsuite/gcc.dg/tree-ssa/loop-interchange-12.c

   1 /* { dg-do run } */
   2 /* { dg-options "-O2 -floop-interchange -fdump-tree-linterchange-details" } */
   3
   4 /* Copied from graphite/interchange-4.c */
   5
   6 #define DEBUG 0
   7 #if DEBUG
   8 #include <stdio.h>
   9 #endif
  10
  11 unsigned u[1024];
  12
  13 static void __attribute__((noinline,noclone,noipa))
  14 foo (int N, unsigned *res)
  15 {
  16   int i, j;
  17   unsigned sum = 1;
  18   for (i = 0; i < N; i++)
  19     for (j = 0; j < N; j++)
  20       sum = u[i + 2 * j] / sum;
  21
  22   *res = sum;
  23 }
  24
  25 extern void abort ();
  26
  27 int
  28 main (void)
  29 {
  30   int i, j;
  31   unsigned res;
  32
  33   u[0] = 10;
  34   u[1] = 200;
  35   u[2] = 10;
  36   u[3] = 10;
  37
  38   foo (2, &res);
  39
  40 #if DEBUG
  41   fprintf (stderr, "res = %d \n", res);
  42 #endif
  43
  44   if (res != 0)
  45     abort ();
  46
  47   return 0;
  48 }
  49
  50 /* { dg-final { scan-tree-dump-not "is interchanged" "linterchange"} } */