File: stkalign.c

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gcc-arm-none-eabi 15%3A12.2.rel1-1
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/* { dg-options "-fno-inline" } */
/* Check that stack alignment is not affected by variables not placed
   on the stack.  */

#include <assert.h>

#define ALIGNMENT 64

unsigned test(unsigned n, unsigned p)
{
  static struct { char __attribute__((__aligned__(ALIGNMENT))) c; } s;
  unsigned x;

  assert(__alignof__(s) == ALIGNMENT);
  asm ("" : "=g" (x), "+m" (s) : "0" (&x));

  return n ? test(n - 1, x) : (x ^ p);
}

unsigned test2(unsigned n, unsigned p)
{
  static struct { char c; } s;
  unsigned x;

  assert(__alignof__(s) != ALIGNMENT);
  asm ("" : "=g" (x), "+m" (s) : "0" (&x));

  return n ? test2(n - 1, x) : (x ^ p);
}

int main (int argc, char *argv[] __attribute__((unused)))
{
  unsigned int x, y;

  x = test(argc, 0);
  x |= test(argc + 1, 0);
  x |= test(argc + 2, 0);

  y = test2(argc, 0);
  y |= test2(argc + 1, 0);
  y |= test2(argc + 2, 0);

  return (x & (ALIGNMENT - 1)) == 0 && (y & (ALIGNMENT - 1)) != 0 ? 1 : 0;
}