ppc question for altivec

[Dale Johannesen]

On Friday, January 25, 2002, at 05:32 PM, mike stump wrote:

> Stan, the failure mode of this should be so spectacular, that I don't
> see how darwin could get by with this bug in it.  My code goes back to
> the moto altivec release with a gcc from 1998.  Stan, can you see this
> in any of your compilers for darwin/altivec?

darwin.h has this:
/* Pad the outgoing args area to 16 bytes instead of the usual 8.  */

#undef STARTING_FRAME_OFFSET
#define STARTING_FRAME_OFFSET                                           \
   (RS6000_ALIGN (current_function_outgoing_args_size                    \
    + RS6000_VARARGS_AREA                                                \
    + RS6000_SAVE_AREA, 16))

#undef STACK_DYNAMIC_OFFSET
#define STACK_DYNAMIC_OFFSET(FUNDECL)                                   \
   (RS6000_ALIGN (current_function_outgoing_args_size                    \
    + (STACK_POINTER_OFFSET), 16))

I vaguely remember doing this when I ran into the problems you're seeing
(long before Aldy's code was in).  I don't know if it's the right general
approach, though; I didn't like the design either.