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Date: Tue, 27 Aug 2013 16:34:31 +0200
From: Luca Barbato <>
Subject: Re: Optimized C memset

On 27/08/13 16:21, Rich Felker wrote:
> If you're saying testing __has_may_alias__ rather than __GNUC__ buys
> us more portability, I don't see a reason to believe this. A
> hypothetical non-GNUC compiler might need an actual pointer variable
> (rather than cast through a pointer type with may_alias on it) to
> avoid the aliasing violation, or it might require a special attribute
> on the function indicating that the whole function has immunity from
> the aliasing rules, or any number of other possibilities.

You might decouple the two:

- support may_alias
- safe to compile code that may alias

Just that the latter is harder to check.


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