gcc/testsuite/gcc.dg/tree-ssa/loop-interchange-13.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, int M, unsigned *res)
  15 {
  16   int i, j;
  17   unsigned sum = 0;
  18   if (N > 0)
  19     for (i = 0; i < M; i++)
  20       for (j = 0; j < N; j++)
  21         sum = u[i + 3 * j] - sum;
  22
  23   *res = sum;
  24 }
  25
  26 extern void abort ();
  27
  28 int
  29 main (void)
  30 {
  31   int i, j;
  32   unsigned res;
  33
  34   u[0] = 1;
  35   u[1] = 2;
  36   u[2] = 4;
  37   u[3] = 5;
  38   u[4] = 7;
  39   u[5] = 8;
  40
  41   foo (2, 3, &res);
  42
  43 #if DEBUG
  44   fprintf (stderr, "res = %d \n", res);
  45 #endif
  46
  47   if (res != 13)
  48     abort ();
  49
  50   return 0;
  51 }
  52
  53 /* { dg-final { scan-tree-dump-not "is interchanged" "linterchange"} } */