gcc/testsuite/gcc.dg/pr57134.c

   1 /* { dg-do compile } */
   2 /* { dg-require-effective-target stdint_types } */
   3 /* { dg-options "-O2" } */
   4 /* { dg-options "-O2 -mstrict-align" { target { powerpc*-*-linux* powerpc*-*-elf* } } } */
   5
   6 #include <stdint.h>
   7
   8 typedef struct {
   9   int64_t counter;
  10 } atomic64_t;
  11
  12 struct buffer_page {
  13   void *a, *b;
  14   atomic64_t entries;
  15 };
  16
  17 static __inline__ __attribute__((always_inline)) int64_t
  18 atomic64_read(const atomic64_t *v)
  19 {
  20  int64_t t;
  21  __asm__ __volatile__("" : "=r"(t) : "m"(v->counter));
  22  return t;
  23 }
  24
  25 int rb_remove_pages(void *p)
  26 {
  27   struct buffer_page *blah = (void *)((intptr_t) p & -4);
  28   return atomic64_read(&blah->entries);
  29 }