[PATCH] Fix PR 14262 breakage on Darwin

[Geoff Keating]

Alan Modra <amodra@bigpond.net.au> writes:

> On Thu, Mar 25, 2004 at 12:00:32AM +0100, Ulrich Weigand wrote:
> > unfortunately my patch to fix PR 14262 broke Darwin, as pointed out
> > by Andreas Tobler (in the PR record).
> 
> I suspect that libffi for darwin ought to use the stack copy..
> 
> > happens on Darwin, where 3-byte structs are supposed to be passed
> > left-aligned on the stack *and* left-aligned in a register, and
> > the callee reads them left-aligned from the stack.
> 
> ..because this seems a little weird.  I don't think the function call
> machinery in gcc is intended to support args passed both in regs and
> on the stack, at least not without using PARALLELs to describe the
> reg and stack copies separately.  See the struct arg_data.pass_on_stack
> comment.

It's possible that this requirement in the rs6000 port predates the use
of PARALLELs to describe it.

-- 
- Geoffrey Keating <geoffk@geoffk.org>