On 4 October 2012 01:37, Dave Hylands <[email protected]> wrote:
> There is do_div (for all architectures) and div_u64_rem (for x86) in
> <asm/div64.h>
do_div appears to be almost perfect. But I really don't understand it.
I can pull out the digits really easily with
for (i = c ; i > 0 ; i--){
out[i] = digits[do_div(tmp, 10)];
}
(digits is an array of numerals and abcdef)
do_div returns the remainder, and divides the first argument by the
second. _in_place_.
It's the in-place bit I don't understand. It isn't passed by
reference, it isn't a pointer, it is a normal u64 integer.
(I tried using a pointer, and it doesn't work)
http://codepad.org/UdqruNIt shows an example.
What am I missing? I read of "understanding the side effects" on the
web. I don't even understand the intended effects.
--
atp
If you can't fix it, you don't own it.
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