From: Luca Barbato <lu_zero@gentoo.org>
To: musl@lists.openwall.com
Subject: Re: Optimized C memset
Date: Tue, 27 Aug 2013 16:34:31 +0200 [thread overview]
Message-ID: <521CB8F7.6050507@gentoo.org> (raw)
In-Reply-To: <20130827142159.GQ20515@brightrain.aerifal.cx>
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.
lu
next prev parent reply other threads:[~2013-08-27 14:34 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-27 8:30 Rich Felker
2013-08-27 8:52 ` Jens Gustedt
2013-08-27 9:17 ` Rich Felker
2013-08-27 9:50 ` Jens Gustedt
2013-08-27 14:21 ` Rich Felker
2013-08-27 14:34 ` Luca Barbato [this message]
2013-08-27 14:39 ` Rich Felker
2013-08-27 15:20 ` John Spencer
2013-08-27 15:34 ` Rich Felker
2013-08-27 16:22 ` Optimized C memset [v2] Rich Felker
2013-08-27 17:28 ` Jeremy Huntwork
2013-08-27 21:27 ` Rich Felker
2013-08-28 0:05 ` Andre Renaud
2013-08-28 1:24 ` Rich Felker
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