Re: How can I link the kernel with libgcc ?

[Carlos Munoz]

Al Viro wrote:

> On Fri, Mar 10, 2006 at 10:03:58AM -0800, Carlos Munoz wrote:
>  
>
> > >              ydef[22] = (u_int32_t)(log10((double)(over & 0x0000003f)) /
> > >                                     log10(2));
> > >      
>
> You've got to be kidding.  Let's take a good look at that expression:
> log10(x)/log10(2) is what?  Right, base-2 logarithm of x.  Then you cast
> it to unsigned, i.e. round it down.  In other words, you want to know the
> highest bit in (over & 0x3f).  Which is to say, (fls(over & 0x3f) - 1).
> Sigh...
>  
Hi Al,

You are right, so easy. I will look at the data sheet and make sure the 
same approach can be applied to all places calling for log10 
calculations. I wonder why the data sheet calls for log10 calculations. 
It threw me off... should have know better though.

Thanks,


Carlos Munoz
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/