Re: PATCH: Don't allocate space for SSE reg in reg save area if SSE is disabled

[Jakub Jelinek <jakub at redhat dot com>]

On Fri, Aug 29, 2008 at 08:07:48AM -0700, H.J. Lu wrote:
> It turns out that ix86_varargs_gpr_size can't be 0 since va_arg
> is processed before setup_incoming_varargs_64 is called. But

va_arg is expanded at gimplification time, then pass_stdarg determines
if and how many gprs and fprs need to be saved, then at expand time
setup_incoming_varargs_64 is called.  Of course cfun->va_list_gpr_size
can be 0 at that point (e.g. for the testcase I posted).
Your solution to allocate the GPR save area even when no gprs, but some
fprs need to be saved of course will work, but is not optimal.

	Jakub