On Sun, 25 Mar 2007 03:42:25 +0000 "yuan cooper" <[EMAIL PROTECTED]> wrote:
> Hi all: > > during my work, I found there is a bug with GCC4 O2 optimization. > > --------------------- > float ftmp; > unsigned long tmp; > ftmp = 1.0/1024.0; > tmp = *(unsigned long *)(&ftmp); > tmp = (tmp >> 11) && 0xFFF; > --------------------- > > if optimization level is O2, gcc will MOV eax to tmp, but current eax has a > random value. > -O is ok and gcc3 with O2 is ok too. > > > I am a kernel newbie, I don't know how to make contributions to janitors, who > will help me? It's my first post, any suggestion will be appreciated. Don't use floating point in kernel code. At all. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
