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SubjectRe: which gcc version?
On Thu, Apr 05, 2001 at 07:39:14PM +0530, Manoj Sontakke wrote:
> hi
> On Thu, 5 Apr 2001, Alexander Viro wrote:
> > On Thu, 5 Apr 2001, Manoj Sontakke wrote:
> >
> > > Hi
> > > I am getting linker error "undefined reference to __divdi3".
> > > This is because c = a/b; where a,b,c are of type "long long"
> > > I understand this is gcc problem.
> > > I am doing this on a pentium with gcc -v = egcs-2.91.66
> >
> > Don't do it in the kernel. It has nothing to gcc version.
> Addition and subtraction works fine. The problem is with multiplication
> and division. I am doing this to avoid floating point calculation and
> doing fixed point calculation. The rage is large enough to need "long
> long" Any other way to achieve this?

How arbitrary is the divisor ?
Not by change a power-of-two ?

If it is arbitrary, how large ?
The printk() contains support routine doing longlong/int
division when a) speed is *not* important, b) divisor is
sufficiently small, and I think c) divisor is positive.

When you look at that code, you should begin to grasp,
what kind of monster is the longlong/longlong code at -lgcc ...
(and why gcc doesn't produce inline code for it.)

> thanks
> manoj

/Matti Aarnio
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