> So what gcc does may be technically legal, but it's still a horribly
> bad thing to do. Sadly, some gcc people seem to care more
> about "letter
> of the law" than "sanity and quality of implementation".
You know, it would be one thing if they were consistent. A policy that, by
default, you get
On Sun, 25 Mar 2007 03:42:25 + "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)
On Sun, 25 Mar 2007, yuan cooper wrote:
> �
> during my work, I found�there is a bug with GCC4 O2 optimization.
Technically, it's a misfeature fo gcc4, not a bug.
The C language allows for type-based alias detection, and gcc notices that
a "float *" cannot ever alias with a "unsigned long *",
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