From: Agner Fog <agner@agner.org>
To: cygwin@cygwin.com
Subject: Re: Inefficient use of 64-bit addresses in Clang
Date: Wed, 14 Aug 2019 05:51:00 -0000 [thread overview]
Message-ID: <024ce5b5-6024-b371-e382-5eef5d1d4a90@agner.org> (raw)
In-Reply-To: <732305300.268416262.1565603129541.JavaMail.root@zimbra54-e10.priv.proxad.net>
It's a difference in memory model.
clang 6.0.0 under ubuntu with --target=x86_64-pc-cygwin gives relative
addresses, unless you specify -mcmodel=large.
Cygwin clang with -mcmodel=small does the right thing: use relative
addresses.
The -mcmodel=small option appears to work differently for Linux and for
Windows targets. I cannot find any documentation of this difference. See:
https://bugs.llvm.org/show_bug.cgi?id=42983
On 12/08/2019 11.45, falk.tannhauser@free.fr wrote:
> References: <578eb489-9391-9009-82ad-676eeb4c1c92@agner.org>
> In-Reply-To: <578eb489-9391-9009-82ad-676eeb4c1c92@agner.org>
>
> Could the different behaviour between Cygwin and Linux simply be due to different Clang versions?
> The current version under Cygwin is 5.0.1, while the latest version available under Linux
> appears to be 8.0.1 .
>
> Falk
>
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next prev parent reply other threads:[~2019-08-14 5:51 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1436640898.268382790.1565602671940.JavaMail.root@zimbra54-e10.priv.proxad.net>
2019-08-12 9:45 ` falk.tannhauser
2019-08-14 5:51 ` Agner Fog [this message]
2019-08-16 6:06 ` Clang is using the wrong memory model Agner Fog
2019-08-16 8:25 ` Mark Geisert
2019-08-16 8:26 ` Corinna Vinschen
2019-08-16 9:27 ` Agner Fog
2019-08-16 9:52 ` Agner Fog
2019-08-16 10:39 ` Corinna Vinschen
2019-08-16 10:50 ` Agner Fog
2019-08-16 11:25 ` Corinna Vinschen
2019-08-16 13:28 ` Kai Tietz
2019-08-17 6:59 ` Agner Fog
2019-08-17 9:48 ` Corinna Vinschen
2019-08-18 11:37 ` Agner Fog
2019-08-18 11:58 ` Corinna Vinschen
2019-08-18 18:14 ` Agner Fog
2019-08-19 8:58 ` Corinna Vinschen
2019-08-06 12:30 Inefficient use of 64-bit addresses in Clang Agner Fog
2019-08-12 9:20 ` Mark Geisert
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