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Message-ID: <550964BC.4070405@openwall.com>
Date: Wed, 18 Mar 2015 14:42:52 +0300
From: Alexander Cherepanov <ch3root@...nwall.com>
To: john-dev@...ts.openwall.com
Subject: Re: 256/128 bit integer arithmatic
On 2015-03-17 11:07, magnum wrote:
> #define UINT128_MAX ((uint128_t)-1)
>
> That last line is because we can't (even in gcc-5 afaik) express
> constants larger than ULL. We could set a positive number using shifts
> but the above works fine.
If the rules for uint128_t are the same as for other unsigned types in C
then ((uint128_t)-1) is a valid and probably the cleanest way to express
UINT128_MAX.
--
Alexander Cherepanov
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