Re: [PATCH v2 1/4] siphash: add cryptographically secure hashtable function

Hannes Frederic Sowa
2016-12-15T12:50:09Z

On 15.12.2016 13:28, David Laight wrote:
> From: Hannes Frederic Sowa
>> Sent: 15 December 2016 12:23
> ...
>> Hmm? Even the Intel ABI expects alignment of unsigned long long to be 8
>> bytes on 32 bit. Do you question that?
>
> Yes.
>
> The linux ABI for x86 (32 bit) only requires 32bit alignment for u64 (etc).

Hmm, u64 on 32 bit is unsigned long long and not unsigned long. Thus I
am actually not sure if the ABI would say anything about that (sorry
also for my wrong statement above).

Alignment requirement of unsigned long long on gcc with -m32 actually
seem to be 8.