gcc/testsuite/gcc.dg/tree-ssa/ivopts-lower_base.c

/* { dg-do compile } */
/* { dg-options "-O2 -fdump-tree-ivopts-details" } */
#include <string.h>
#include <stdlib.h>

#define MAX_NUM	(256)

void
sort_pointers (size_t n, void **pointers, void **work)
{
  typedef unsigned char digit_t;
  unsigned int count[MAX_NUM];
  int big_endian_p;
  size_t i;
  size_t j;

  if ((sizeof (void *) / sizeof (digit_t)) % 2 != 0)
    abort ();

  for (i = 0, j = 0; i < sizeof (size_t); ++i)
    {
      j *= MAX_NUM;
      j += i;
    }

  big_endian_p = (((char *)&j)[0] == 0);
  for (i = 0; i < sizeof (void *) / sizeof (digit_t); ++i)
    {
      digit_t *digit;
      digit_t *bias;
      digit_t *top;
      unsigned int *countp;
      void **pointerp;

      if (big_endian_p)
	j = sizeof (void *) / sizeof (digit_t) - i;
      else
	j = i;

      memset (count, 0, MAX_NUM * sizeof (unsigned int));
      bias = ((digit_t *) pointers) + j;
      top = ((digit_t *) (pointers + n)) + j;
      for (digit = bias;
	   digit < top;
	   digit += sizeof (void *) / sizeof (digit_t))
	++count[*digit];

      for (countp = count + 1; countp < count + MAX_NUM; ++countp)
	*countp += countp[-1];

      for (pointerp = pointers + n - 1; pointerp >= pointers; --pointerp)
	work[--count[((digit_t *) pointerp)[j]]] = *pointerp;

      pointerp = pointers;
      pointers = work;
      work = pointerp;
    }
}

/* { dg-final { scan-tree-dump-not "base \[^\\n\]*&MEM\\\[" "ivopts" } }  */