fwrapv-1.c

来自「Mac OS X 10.4.9 for x86 Source Code gcc」· C语言 代码 · 共 29 行

/* Copyright (C) 2003 Free Software Foundation.

   Test that the -fwrapv command line option is accepted and disables
   "unsafe" optimizations that rely on undefined arithmetic overflow.

   Written by Roger Sayle, 24th March 2003.  */

/* { dg-do run } */
/* { dg-options "-O2 -fwrapv" } */

#include <limits.h>

extern void abort ();

int test(int x)
{
  return (2*x)/2;
}

main()
{
  int x = INT_MAX;

  if (test(x) == x)
    abort ();
  return 0;
}