From owner-freebsd-hackers@FreeBSD.ORG  Mon Feb 21 19:01:36 2011
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Date: Mon, 21 Feb 2011 10:36:39 -0800
From: Yuri <yuri@rawbw.com>
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Subject: FreeBSD ABI?
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Where is it documented?
Are there differences with the linux ABI?

Particularly I am interested in stack alignment requirement. For example 
i386 Solaris, Linux and MacOS have 16 bit stack alignment for procedure 
calls. This is reflected in LLVM sources:

   if (isTargetDarwin() || isTargetLinux() || isTargetSolaris() || Is64Bit)
     stackAlignment = 16;


But FreeBSD is excluded there. Is this a bug in LLVM which magically 
doesn't cause crashes or this is correct and FreeBSD doesn't have 16 bit 
alignment?

Yuri