gcc/testsuite/gcc.dg/tree-ssa/pr84969.c

/* { dg-do run } */
/* { dg-options "-O2 -ftree-loop-distribute-patterns" } */

static void
__attribute__((noipa, noinline))
foo (char **values, int ndim, char *needquotes, int *dims)
{
  int i;
  int j = 0;
  int k = 0;
  char *retval = (char *)__builtin_malloc(1000); 
  char *p = retval;
  char *tmp;

  int indx[111];

#define APPENDSTR(str)	(__builtin_strcpy(p, (str)), p += __builtin_strlen(p))
#define APPENDCHAR(ch)	(*p++ = (ch), *p = '\0')

	APPENDCHAR('{');
	for (i = 0; i < ndim; i++)
		indx[i] = 0;
	do
	{
		for (i = j; i < ndim - 1; i++)
			APPENDCHAR('{');

			APPENDSTR(values[k]);
		k++;

		for (i = ndim - 1; i >= 0; i--)
		{
			indx[i] = (indx[i] + 1) % dims[i];
			if (indx[i])
			{
				APPENDCHAR(',');
				break;
			}
			else
				APPENDCHAR('}');
		}
		j = i;
	} while (j != -1);

	if (__builtin_strcmp (retval, "{{{0,1},{2,3}}}") != 0)
	  __builtin_abort ();
}

int main()
{
  char* array[4] = {"0", "1", "2", "3"};
  char f[] = {0, 0, 0, 0, 0, 0, 0, 0};
  int dims[] = {1, 2, 2};
  foo (array, 3, f, dims);

  return 0;
}