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Subject: Re: [boost] [Endian] Performance
From: John Filo (filo_at_[hidden])
Date: 2011-09-09 08:53:30

On 09/09/2011 03:29 AM, Mathias Gaunard wrote:
> On 07/09/2011 14:16, John Filo wrote:
>> I.e. I added:
>> #elif USE_BIG
>> return *reinterpret_cast<const ubig32_t*>(&src);
>> #elif USE_LITTLE
>> return *reinterpret_cast<const ulittle32_t*>(&src);
>> #elif USE_NATIVE
>> return src;
> This breaks aliasing rules.

I wondered about that; I assumed that since the return statement was the
only memory read from memory in the function, and that there were no
writes that aliasing wouldn't be a problem. Also, I had -Wall on and
GCC didn't complain, so I assumed it was okay. I guess I need to read up
on what the exact rules are.

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