Ian Collins <ian-n...@hotmail.com> writes:
> On 09/ 6/10 09:57 PM, robin wrote:
>> "Ian Collins"<ian-n...@hotmail.com>  wrote in message news:8ejqjaFhq7U6@mid.individual.net...

>> |>  It's for 32 bit words.
>> |>  As previously, for longer words, it's necessary to truncate.
>> |
>> | Then it shouldn't make assumptions about the sizes of types.  If fixed
>> | width types are required, use them.

>> You would need to truncate to 32 bits immediately after each right shift.

> As I said, use fixed size types.  Otherwise the code won't work in 64
> bit builds.

> #include <stdint.h>

> uint32_t MWC(void)
> {
>   uint32_t t,x;
>   static uint32_t c=0,j=4691;

>   j=(j<4690)? j+1:0;
>   x=Q[j];
>   t=(x<<13)+c;

>   if(t<c) {
>     c=(x>>19)+1;
>     t=t+x;
>   }
>   else {
>     t=t+x;
>     c=(x>>19)+(t<x);
>   }
>   return Q[j]=t;
> }