pr7284-1.c

来自「用于进行gcc测试」· C语言 代码 · 共 25 行

/* Signed left-shift is implementation-defined in C89 (and see
   DR#081), not undefined.  Bug 7284 from Al Grant (AlGrant at
   myrealbox.com).  */

/* { dg-options "-std=c89" } */

extern void abort (void);
extern void exit (int);

int
f (int n)
{
  return (n << 24) / (1 << 23);
}

volatile int x = 128;

int
main (void)
{
  if (f(x) != -256)
    abort ();
  exit (0);
}