[Bug middle-end/34847] New: gcc doesn't properly align variable on stack for nested function

[hjl dot tools at gmail dot com]

bash-3.2$ cat x.c
#include <stdio.h>
#include <stddef.h>
#include <stdlib.h>

#ifndef ALIGNMENT
#define ALIGNMENT       16
#endif

typedef int aligned __attribute__((aligned(ALIGNMENT)));

int global;

void
check (int *i)
{
  *i = 20;

  if ((((ptrdiff_t) i) & (__alignof__(aligned) - 1)) != 0)
    {
      printf("\nUnalign address (%d): %p!\n",
             __alignof__(aligned), i);
      abort ();
    }

}

void
foo (void)
{
  aligned j;

  void bar ()
    {
      aligned i;

      check (&i);
      check (&j);

      j = -20;
    }
  bar ();

  if (j != -20)
    abort ();

  check (&j);
  if (j != 20)
    abort ();
}

int
main()
{
  foo ();
  return 0;
}
bash-3.2$ /usr/gcc-4.3/bin/gcc -m32 x.c
bash-3.2$ ./a.out 

Unalign address (16): 0xffc8c3cc!
Aborted
bash-3.2$


-- 
           Summary: gcc doesn't properly align variable on stack for nested
                    function
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: hjl dot tools at gmail dot com
GCC target triplet: i686-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34847