gcc-4.9/gcc/testsuite/gcc.dg/pr57134.c


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/* { dg-do compile } */
/* { dg-require-effective-target stdint_types } */
/* { dg-options "-O2" } */
/* { dg-options "-O2 -mstrict-align" { target { powerpc*-*-linux* powerpc*-*-elf* } } } */

#include <stdint.h>

typedef struct {
  int64_t counter;
} atomic64_t;

struct buffer_page {
  void *a, *b;
  atomic64_t entries;
};

static __inline__ __attribute__((always_inline)) int64_t
atomic64_read(const atomic64_t *v)
{
 int64_t t;
 __asm__ __volatile__("# %0, %1" : "=r"(t) : "m"(v->counter));
 return t;
}

int rb_remove_pages(void *p)
{
  struct buffer_page *blah = (void *)((intptr_t) p & -4);
  return atomic64_read(&blah->entries);
}