[cfe-dev] Deviation from x86-64 calling convention

[John McCall]

On Dec 25, 2011, at 6:42 PM, Joe Groff wrote:
> On Sunday, December 25, 2011, Eli Friedman <eli.friedman at gmail.com> wrote:
> 
> > Yes... unfortunately, that case wasn't clear in the original standard,
> > and versions of gcc from before that clarification implement generate
> > the same code you're seeing from clang.  clang uses the old gcc
> > behavior on OSX, and the spec-compliant behavior on other platforms.
> > If you're interested in the relevant code in clang, search for
> > honorsRevision0_98 in lib/CodeGen/TargetInfo.cpp.
> >
> > -Eli
> 
> Thanks for the reference, Eli. Out of curiosity, is this platform-specific behavior documented anywhere other than the gcc and clang source? Apple's documentation states that Mac OS X follows AMD's spec, without qualification.

We're aware of the discrepancy and are making an effort to resolve it.

John.
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