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Subject: Re: GCC i386 stack misalignment: [package -
 head-i386-default][graphics/rawtherapee-devel] Failed for
 rawtherapee-devel-5.0 in stage
From: Dimitry Andric <dim@FreeBSD.org>
In-Reply-To: <c519fb4d-2154-4dcf-b40e-2796cfe27c0e@FreeBSD.org>
Date: Sun, 29 Jan 2017 20:06:13 +0100
Cc: FreeBSD Toolchain <freebsd-toolchain@freebsd.org>,
 Gerald Pfeifer <gerald@FreeBSD.org>
Message-Id: <2663804A-70D1-4804-B5B4-4F0A964FF929@FreeBSD.org>
References: <201701291703.v0TH3gqR042774@beefy11.nyi.freebsd.org>
 <c519fb4d-2154-4dcf-b40e-2796cfe27c0e@FreeBSD.org>
To: Matthias Andree <mandree@FreeBSD.org>
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On 29 Jan 2017, at 19:35, Matthias Andree <mandree@FreeBSD.org> wrote:
> whenever I've traced one of the attached SIGBUS issues on gcc-compiled
> i386 code with SSE2, I found that it was using unaligned 128-bit =
> 16-byte wide SSE2 access which also needs 16-byte aligned data
> (including stacks).

See these very old bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=40838
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=38496

PR 40838 is 8 years old and still has status NEW, PR38496 has WONTFIX.

E.g. don't count on this getting fixed upstream.

-Dimitry


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