gcc/testsuite/gcc.dg/attr-assume_aligned-3.c

/* { dg-do compile } */
/* { dg-options "-O2 -fdump-tree-optimized" } */

char *my_alloc1 (int len) __attribute__((__assume_aligned__ (32)));
char *my_alloc2 (int len) __attribute__((assume_aligned (32, 4)));

int
test1 (int len)
{
  int i;
  char *p = my_alloc1 (len);
  return ((__INTPTR_TYPE__) p) & 31;
}

int
test2 (int len)
{
  int i;
  char *p = my_alloc2 (len);
  return (((__INTPTR_TYPE__) p) & 31) != 4;
}

/* { dg-final { scan-tree-dump-times "return 0" 2 "optimized" } } */