On 12 Jun 2007 17:53:19 -0000, gangren at google dot com <[EMAIL PROTECTED]> wrote:
I'm aware of integral promotion. But not quite understand why we can optimize (short)((int)short_var + (int)short_var) to (short)((unsigned short)short_var + (unsigned short)short_var), but not to (short)((short)short_var + (short)short_var)? Is it because unsigned short has different overflow handling?
Yes, signed short has undefined overflow, while unsigned is defined as wrapping. --Pinski
