20030807-3.c

来自「linux下编程用 编译软件」· C语言 代码 · 共 28 行

/* { dg-do compile } */
/* { dg-options "-O1 -fdump-tree-dom3" } */
                                                                                
typedef unsigned int cppchar_t;
cppchar_t
cpp_parse_escape (pstr, limit, wide)
     const unsigned char **pstr;
     const unsigned char *limit;
     int wide;
{
  cppchar_t i = 0;
  int overflow = 0;
  cppchar_t mask = ~0;

   while (*pstr < limit)
     {
       overflow |= i ^ (i << 4 >> 4);
       i = oof ();
     }
   if (overflow |  (i != (i & mask)))
     foo();
}

/* There should be precisely three IF statements.  If there is
   more than two, then the dominator optimizations failed.  */
/* { dg-final { scan-tree-dump-times "if " 3 "dom3"} } */
/* { dg-final { cleanup-tree-dump "dom3" } } */