gcc/testsuite/gcc.dg/tree-ssa/loop-interchange-15.c

   1 /* PR tree-optimization/83337 */
   2 /* { dg-do run { target int32plus } } */
   3 /* { dg-options "-O2 -floop-interchange" } */
   4 /* { dg-require-effective-target alloca }  */
   5 /* { dg-skip-if "too big stack" { visium-*-* } } */
   6
   7 /* Copied from graphite/interchange-5.c */
   8
   9 #define DEBUG 0
  10 #if DEBUG
  11 #include <stdio.h>
  12 #endif
  13
  14 #define N 100
  15 #define M 1111
  16
  17 extern void abort ();
  18
  19 static void __attribute__((noipa))
  20 foo (int n)
  21 {
  22   int i, j;
  23   struct S { char d[n]; int a : 3; int b : 17; int c : 12; };
  24   struct S A[N][M];
  25
  26   for (i = 0; i < N; i++)
  27     {
  28       asm volatile ("" : : "g" (&A[0][0]) : "memory");
  29       for (j = 0; j < M; j++)
  30         A[i][j].b = 2;
  31     }
  32   asm volatile ("" : : "g" (&A[0][0]) : "memory");
  33
  34   for (i = 0; i < M; i++)
  35     for (j = 0; j < N; j++)
  36       A[j][i].b = 5 * A[j][i].b;
  37
  38   asm volatile ("" : : "g" (&A[0][0]) : "memory");
  39   int res = A[0][0].b + A[N-1][M-1].b;
  40
  41 #if DEBUG
  42   fprintf (stderr, "res = %d \n", res);
  43 #endif
  44
  45   if (res != 20)
  46     abort ();
  47 }
  48
  49 int
  50 main (void)
  51 {
  52   foo (1);
  53   foo (8);
  54   return 0;
  55 }