Viewing file:  loop-interchange-3.c (1 KB) -rw-r--r--
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/* { dg-do run } */
/* { dg-options "-O2 -floop-interchange -fdump-tree-linterchange-details" } */
/* { dg-require-effective-target size20plus } */
/* { dg-skip-if "too big stack" { visium-*-* } } */
/* Copied from graphite/interchange-6.c */
#define DEBUG 0
#if DEBUG
#include <stdio.h>
#endif
#define N 100
#define M 200
static int __attribute__((noinline))
foo (int A[N][M])
{
int i, j;
/* This loop should be interchanged. */
for(j = 0; j < M; j++)
for(i = 0; i < N; i++)
A[i][j] = A[i][j] + A[i][j];
return A[0][0] + A[N-1][M-1];
}
extern void abort ();
static void __attribute__((noinline))
init (int *arr, int i)
{
int j;
for (j = 0; j < M; j++)
arr[j] = 2;
}
int
main (void)
{
int A[N][M];
int i, j, res;
for (i = 0; i < N; i++)
init (A[i], i);
res = foo (A);
#if DEBUG
fprintf (stderr, "res = %d \n", res);
#endif
if (res != 8)
abort ();
return 0;
}
/* { dg-final { scan-tree-dump-times "Loop_pair<outer:., inner:.> is interchanged" 1 "linterchange"} } */
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