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Re: Problem with std_expand_builtin_va_start on targets where sizetype and ptr_type_node don't have the same mode
- From: Ian Lance Taylor <iant at google dot com>
- To: "Zack Weinberg" <zackw at panix dot com>
- Cc: "GCC Development" <gcc at gcc dot gnu dot org>, "DJ Delorie" <dj at redhat dot com>
- Date: 05 Jul 2007 18:22:50 -0700
- Subject: Re: Problem with std_expand_builtin_va_start on targets where sizetype and ptr_type_node don't have the same mode
- References: <email@example.com>
"Zack Weinberg" <firstname.lastname@example.org> writes:
> rtx va_r = expand_normal (valist);
> emit_move_insn (va_r, nextarg);
> but this is a part of the compiler I am not at all familiar with...
I think you would want something more like
rtx va_r = expand_expr (valist, NULL_RTX, VOIDmode, EXPAND_WRITE);
convert_move (va_r, nextarg, 0);
but other than that I don't see why this would fail. I think you
should give it a try. Of course you would need to test it on a
backend which does not #define EXPAND_BUILTIN_VA_START; I think ARM is
the only primary platform for which that is true.