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SubjectRe: div64.h:do_div() bug
On Tue, Sep 30, 2003 at 01:14:38PM +0300, Matti Aarnio wrote:
> On Tue, Sep 30, 2003 at 11:52:29AM +0200, Rogier Wolff wrote:
> > On Mon, Sep 29, 2003 at 03:25:19PM +0200, Artur Klauser wrote:
> > > I've found that a bug in asm-arm/div64.h:do_div() is preventing correct
> > > conversion of timestamps in smbfs (and probably ntfs as well) from NT to
> >
> > Nope.
>
> Nope yourself.
>
> > > if (in.n64 != out.n64) {
> > > printf("FAILURE: asm/div64.h:do_div() is broken for 64-bit dividends\n");
> >
> > do_div should be/is documented as not doing 64 bit dividents. It does
> > 64/32 -> 32 divides, IIRC...
>
> 64/32 -> 64,32
>
> The REMAINDER is 32 bit value.

Non-native english speaker makes the mistake.. MODULUS is 32 bits as is
DIVISOR, REMAINDER is 64 bit, as is DIVIDEND.

That is:
DIVIDEND / DIVISOR -> REMAINDER , MODULUS

and
REMAINDER * DIVISOR + MODULUS = DIVIDEND

> > Roger.

/Matti Aarnio
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